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Articles 1711 - 1740 of 302419

Full-Text Articles in Physical Sciences and Mathematics

Sheep Production On An Annual And Perennial Pasture In Southwest Australia, P Sanford, J Gladman, L Cransberg Jul 2024

Sheep Production On An Annual And Perennial Pasture In Southwest Australia, P Sanford, J Gladman, L Cransberg

IGC Proceedings (1993-2023)

Sheep production on an annual and perennial pasture stocked at 11.5 dse/ha, was compared in a mediterranen environment at Manypeaks in Western Australia. The annual sward comprised of 48% subterranean clover (Trifolium subterraneum L.), 20 % annual grasses (Lolium rigidum Gaudin, Hordeum leporinum Link, Vulpia bromoides (L.) S.F. Gray) and 32% capeweed (Arctotheca calendula L.). The perennial sward was 19% kikuyu (Pennisetum clandestinum), 36% subterranean clover, 43% annual grasses (Lolium rigidum Gaudin, Hordeum leporinum Link, Vulpia bromoides (L.) S.F. Gray) and only 2% capeweed which was displaced by kikuyu. Both pasture types had similar growth …

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Milk Production And Composition In Charolais And Polled Hereford Cows On Different Forage Systems, J M. Phillips, R B. Simpson, J D. Shockey, S C. Nickerson Jul 2024

Milk Production And Composition In Charolais And Polled Hereford Cows On Different Forage Systems, J M. Phillips, R B. Simpson, J D. Shockey, S C. Nickerson

IGC Proceedings (1993-2023)

The objective of this study was to study the effect of different winter and summer forage systems on milk production and composition in beef cows. Charolais and Polled Hereford cows were assigned to receive either grass hay and supplemental feed or ryegrass pasture during the late winter/early spring period, and then allowed to either graze warmseason grass pasture on a continuous or rotational basis during the summer period. Representative cows were machine-milked on day 48 (hay/feed vs ryegrass), on days 117 and 175 (continuous vs rotational grazing) postpartum. Milk weights were recorded and converted to 24- hour yields. Samples were …

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Intensive Grazing Management For Dairy Heifers, J R. Rodgers Jul 2024

Intensive Grazing Management For Dairy Heifers, J R. Rodgers

IGC Proceedings (1993-2023)

After grazing our milking herd on intensive rotational grazing for three years utilizing many paddocks and different types and configurations of fencing to control the wise use of the grass and legume species already on our farm, we moved to develop our second farm into a commercial heifer growing project. This paper will attempt to share our practical experience through three years of grazing upwards of 400 Ayrshire and Holstein heifers from six months of age until just prior to calving. Our ultimate objective is year end financial solvency.

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Pasture Production And Weaned Heifer Performance From Tropical Grasses, P Mislevy, F M. Pate, F G. Martin, L M. Rutter Jul 2024

Pasture Production And Weaned Heifer Performance From Tropical Grasses, P Mislevy, F M. Pate, F G. Martin, L M. Rutter

IGC Proceedings (1993-2023)

The purpose of this experiment is to determine the influence of energy supplement (molasses 80% and cottonseed meal 20% slurry) fed to heifers while grazing Florico and Florona stargrass (Cynodon nlemfuensis Vanderyst var nlemfuensis) and Florakirk bermudagrass (C. dactylon) pastures. Stocking rate of heifers was 5.9 animals ha- 1 averaging 230 kg. Heifers were rotated weekly and were on a 4 pasture rotation. Grasses were allowed a 3-wk regrowth period. Mean forage growth rate cycle-1 day-1 was not different (P>0.05) between grasses; however Florico and Florona yielded 8 and 21% more cycle- 1 than Florakirk. Mean herbage …

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Seasonal Distribution Of Forage Yield From A "Natural" Pasture Under Rotational Grazing, W R. Kanneganti, T R. Dhiman, R P. Walgenbach, L Massingill, M P. Russelle, L D. Satter Jul 2024

Seasonal Distribution Of Forage Yield From A "Natural" Pasture Under Rotational Grazing, W R. Kanneganti, T R. Dhiman, R P. Walgenbach, L Massingill, M P. Russelle, L D. Satter

IGC Proceedings (1993-2023)

A 2-yr grazing study was conducted to quantify forage available daily for cattle intake from a natural pasture managed under rotational grazing. Grazing was initiated around 1 May, and was managed with a rotation length of about 17 d each for cycles 1 and 2, and 30 d each for the rest. In 1994, under adequate moisture conditions, forage availability during 5/1-6/1, 6/1-8/15, 8/15-9/15, and 9/15-10/ 15 was 77, 66, 38 and 14 kg DM ha-1 d-1, respectively, resulting in a total yield of 8580 kg ha-1 in 175 d. In 1995, a prolonged period of dry summer reduced the …

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Production Response To Feed Supplementation Of Dairy Cows In A Seasonal Calving And Grazing System, T R. Dhiman, W R. Kanneganti, R P. Walgenbach, L J. Massingill, M C. Miltbank, M P. Russelle, L D. Satter Jul 2024

Production Response To Feed Supplementation Of Dairy Cows In A Seasonal Calving And Grazing System, T R. Dhiman, W R. Kanneganti, R P. Walgenbach, L J. Massingill, M C. Miltbank, M P. Russelle, L D. Satter

IGC Proceedings (1993-2023)

A study was conducted over a period of two years to determine the impact of supplemental feed on milk yield and reproductive performance of dairy cows in a spring calving and grazing system. Three groups of Holstein cows consumed either all pasture (P), 2/3 (2/3P), or 1/3 (1/3P) of their feed dry matter from a temperate pasture of mixed grasses and white clover (Trifolium repens L.). The balance of feed for the 2/3P and 1/3P groups was supplied by a supplement containing grain and some forage. Cows calved between March and June. During the grazing season cows consumed 0, 5.8 …

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The Effect Of Turnout Date To Pasture In Spring And Grazing Strategy On The Performance Of Spring-Calving Dairy Cows In Wet Land Enviornment, J Maher, S Crosse, M Rath Jul 2024

The Effect Of Turnout Date To Pasture In Spring And Grazing Strategy On The Performance Of Spring-Calving Dairy Cows In Wet Land Enviornment, J Maher, S Crosse, M Rath

IGC Proceedings (1993-2023)

The objective was to investigate the effect of earlier turnout to pasture in spring on animal performance in a wet land environment. Fiftysix spring-calving dairy cows were randomly allocated to four treatments and the stocking rate for each treatment was 2.47 cows/ ha. Cows in three of these treatments commenced grazing in mid- March. The cows on Treatment A grazed 100% of the farm and received 3 kg/day of concentrate. Cows on Treatment B and C grazed 50% of the farm (area designated for silage production), received silage at night, indoors, and 6 kg/day and 3 kg/day of concentrate respectively. …

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Managing A Multi-Forage Rotational Stocking Unit Without Farming Equipment And With The Addition Of Economical Fringe Benefits, R L. Dalrymple, B C. Flatt, F W. Dobbs, J A. Barrick Jul 2024

Managing A Multi-Forage Rotational Stocking Unit Without Farming Equipment And With The Addition Of Economical Fringe Benefits, R L. Dalrymple, B C. Flatt, F W. Dobbs, J A. Barrick

IGC Proceedings (1993-2023)

A specialized introduced forage rotational stocking grazing unit was managed without usual grassland farming equipment and with various alternative management and production techniques as fringe benefits. The forage production techniques have been successful for many years. Livestock production and economic perimeters have been average to above average. The greatest sold beef yield has been 713 pounds of beef per acre. That is excellent considering the low-capital overhead management style of the unit.

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Influence Of Grazing Management Of Autumn Soil Water Deficit Below Perennial Grass Pastures, C A. Clifton, P M. Schroder, J F. Graham Jul 2024

Influence Of Grazing Management Of Autumn Soil Water Deficit Below Perennial Grass Pastures, C A. Clifton, P M. Schroder, J F. Graham

IGC Proceedings (1993-2023)

An assessment was made of the influence of a Phalaris based pasture which was either continuously stocked, rotationally grazed or spelled during summer on the autumn soil water deficit. Soil remained close to saturation at 120 cm under continuously grazed pasture. Rotationally grazed and summer spelled pastures maintained the soil profile at 120 cm in a dry state during summer and autumn. Differences between years and sites could be partly explained by differences in summer rainfall, solar radiation and the amount of green plant material which grew when stock were excluded over the summer-autumn period. Periodic spelling appears to improve …

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The Effect Of Seasonal Deferred Grazing On Porto Cocksfoot, R P. Thompson, A Avery Jul 2024

The Effect Of Seasonal Deferred Grazing On Porto Cocksfoot, R P. Thompson, A Avery

IGC Proceedings (1993-2023)

The objective of this study was to determine whether seasonal deferred grazing regimes could be used to increase the composition of cocksfoot (Dactylis glomerata L) in perennial pastures growing in temperate Australia. The experiment was conducted over three years at two sites; one in Victoria and the other in Tasmania, Australia. Relative to the control of continuous grazing, deferred grazing in spring reduced the amount of cocksfoot in the sward. Conversely, deferred grazing in summer increased the amount of cocksfoot present. It is concluded that deferred grazing can be used to change the amount of cocksfoot in a pasture, …

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The Effect Of Seasonal Deferred Grazing On Phalaris (Phalaris Aquatica) In Temperate Australia, A L. Avery, J F. Graham Jul 2024

The Effect Of Seasonal Deferred Grazing On Phalaris (Phalaris Aquatica) In Temperate Australia, A L. Avery, J F. Graham

IGC Proceedings (1993-2023)

The aim of this study was to determine the effects of deferred grazing strategies on phalaris (Phalaris aquatica) composition in both new and established pastures in temperate Australia. The experiment was conducted over three years at three sites; two in southern Victoria and one in northern Victoria. Relative to the control of continuous grazing all treatments maintained phalaris composition. At two sites winter deferment of grazing increased phalaris composition. It is concluded that deferred grazing of phalaris over the autumn, winter and spring will increase phalaris composition. The critical length of the grazing deferment and timing requires further …

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The Effect Of Grazing Management Options On The Persistence Of Perennial Ryegrass In The Temperate Winter Rainfall Zone Of Southern Australia, John F. Graham, Tim Prance, Robin Thompson Jul 2024

The Effect Of Grazing Management Options On The Persistence Of Perennial Ryegrass In The Temperate Winter Rainfall Zone Of Southern Australia, John F. Graham, Tim Prance, Robin Thompson

IGC Proceedings (1993-2023)

This study examined grazing management options on perennial ryegrass (Lolium perenne) based pastures to determine if perennial ryegrass could be increased in a degraded pasture, or maintained in a newly sown pasture. Study sites were at Hamilton and Cavendish, Victoria; Delamere, South Australia, and Ross and Parattah, Tasmania. Average rainfall is 500mm at Ross, 575mm at Parattah, 700mm at Hamilton, 650mm at Cavendish and 900mm at Delamere. At all sites, 8 core grazing management treatments were imposed, and up to 4 “local options.” Changes in botanical composition indicate that grazing management can influence the amount of perennial ryegrass …

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Milk Production And Feed Intake At Different Stocking Rates In An Intensive Grazing System, Y Togamura, K Ochiai, S Shioya, K Otsuki Jul 2024

Milk Production And Feed Intake At Different Stocking Rates In An Intensive Grazing System, Y Togamura, K Ochiai, S Shioya, K Otsuki

IGC Proceedings (1993-2023)

The purpose of this research was to determine milk productivity from pasture, using dairy cows of higher performance (>7500 kg for a 305-day lactation) in an intensive grazing system. In both 1993 and 1994 two groups of 3 cows each were grazed from spring to autumn: one group in 1.1 ha (LS) and the other group in 0.65 ha (HS) pasture. A different part of each pasture was cut for hay or silage twice a year. Concentrate and roughage were supplied according to the nutrient requirement of the cows. Milk production from grazed and harvested herbage of the LS …

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Pasture Heterogeneity Created By Grazing Of Cattle Biotypes With Different Body Size, M S. Cid, M A. Brizuela, M S. Aello, C Ferri Jul 2024

Pasture Heterogeneity Created By Grazing Of Cattle Biotypes With Different Body Size, M S. Cid, M A. Brizuela, M S. Aello, C Ferri

IGC Proceedings (1993-2023)

Cattle grazing leads to the generation of patches differing in forage quality and quantity even in virtually monoespecific pastures. This work assesses the effect of two biotypes of different growth rate and mature body weight on the patchiness of a tall fescue pasture. We analysed height, herbage mass by unit surface, and proportions of heavily and lightly utilized patches through a residual herbage mass gradient generated by both biotypes at four stocking rates from March to December. At the end of spring the residual herbage of paddocks grazed by the small biotype was more heterogeneous. The percentage of heavily utilized …

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Forage Productivity And Animal Performance On Different Grass/Legume Pastures For Grazing Management, Sung Seo, Joung Kyong Lee, Dong Eun Shin Jul 2024

Forage Productivity And Animal Performance On Different Grass/Legume Pastures For Grazing Management, Sung Seo, Joung Kyong Lee, Dong Eun Shin

IGC Proceedings (1993-2023)

A grazing trial was carried out to determine the effects of different grass/legume pastures on forage productivity, nutritive value, and animal performance. The pasture mixtures were mainly orchardgrass (OG)+ladino clover(T1), mainly OG+alfalfa(T2), mainly perennial ryegrass+alfalfa(T3), and grasses alone (mainly OG, T4). The pastures were rotationally grazed 7 times with growing heifers in 1991 and 1992. The proportion rate of ladino clover in T1 mixtures rapidly increased from 21% up 54 to 68% during the grazing season. However, the rate of alfalfa in T2 and T3 ranged between 12% and 23%. The annual dry matter yield ranged from 9.19 in T4 …

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Effects Of Regrowth Interval In The Autumn On Growth Of Grass In The Autumn/Winter Period, Edward G. O'Riordan Jul 2024

Effects Of Regrowth Interval In The Autumn On Growth Of Grass In The Autumn/Winter Period, Edward G. O'Riordan

IGC Proceedings (1993-2023)

The effect of Autumn grass regrowth interval on herbage production was studied during the Autumn/Winter periods of 1992/93 and 1993/ 94. Treatments, consisting of continual grass growth intervals ranging from 3 to 22 weeks after September 1, were used to examine the effects of Autumn grass regrowth intervals on herbage production. Herbage dry matter accumulation increased linearly from weeks 3 to 12, then plateaued and began to decrease after week 15 (mid- December). Dead material increased over time. Repeatedly harvested swards (every, 3, 4 or 5 weeks) generally produced less (P<0.05) herbage dry matter than corresponding continual growth treatments. Sward digestibility remained high (780 g/kg) for 9 to 10 weeks) and then declined. Highest digestibilities were seen on the more frequently defoliated treatments. Spring herbage production was highest in treatments which had been harvested under a long regrowth interval during the previous autumn.

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Beef Production From Grazed Grass And Grass/Clover Swards, Edward G. O'Riordan Jul 2024

Beef Production From Grazed Grass And Grass/Clover Swards, Edward G. O'Riordan

IGC Proceedings (1993-2023)

grazed grass (fertiliser nitrogen treated) and grass/clover swards, during two grazing seasons which extended from early-April until mid-November. Both permanent (Treatments A, B and C) and reseeded (Treatment D, E and F) swards were respectively stocked with 3000, 2500 and 2000 kg liveweight/ha in Spring using fifteen steers/treatment (liveweight = 570kg/head). There were small and generally non-significant treatment effects on final liveweight in both years, but heavier carcasses were observed on the reseeded swards (P<0.05). Clover based swards (Treatments B, C and E, F) produced heavier carcasses (P<0.05) than the nitrogen fertilised grass swards (Treatments A and D). Pasture production ranged from 7540 to 10,469 and from 6360 to 11,606 kg DM/ha in year 1 and 2 respectively, with highest yields being observed on the nitrogen fertilised treatment and on the reseeded swards.

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Cattle Weight Gain And Sward-Animal Nitrogen Relationships In Grazed Hemarthria Altissima Pastures, L E. Sollenberger, G F. Lima, J F. Holderbaum, W E. Kunkle, J E. Moore, A C. Hammond Jul 2024

Cattle Weight Gain And Sward-Animal Nitrogen Relationships In Grazed Hemarthria Altissima Pastures, L E. Sollenberger, G F. Lima, J F. Holderbaum, W E. Kunkle, J E. Moore, A C. Hammond

IGC Proceedings (1993-2023)

Limpograss (Hemarthria altissima [Poir.] Stapf et C.E. Hubb.) in vitro digestion is greater than most perennial grasses adapted to Florida. Weight gain of cattle grazing limpograss has been lower than expected due in part to low herbage N concentration. Experiments were conducted on limpograss pastures to assess N fertilization, overseeding of the legume aeschynomene (Aeschynomene americana L), and feeding of N supplements to cattle as means of overcoming this limitation. Greater N fertilization, overseeding aeschynomene, and supplementation (corn-urea mixtures) increased weight gain 0.30, 0.23, and 0.24-0.35 kg d-1, respectively, over control treatments. Herbage digestible organic matter:crude protein ratio …

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White Clover Content In New Zealand Pastures Affects Milksolids Production, S` L. Harris, D A. Clark Jul 2024

White Clover Content In New Zealand Pastures Affects Milksolids Production, S` L. Harris, D A. Clark

IGC Proceedings (1993-2023)

As a preliminary experiment to measuring milksolids (fat plus protein) production of dairy cattle grazing swards containing different levels of white clover (Trifolium repens L.) nine Jersey and nine Friesian cattle housed indoors during late lactation and fed diets containing either 20, 50 or 80% white clover with the balance perennial ryegrass (Lolium perenne L.). During the first 10 day measurement period cows were fed ad libitum and during the second 10 days feeding was restricted to 75% of metabolisable energy requirement. Milk yields of cows fed 50 and 80% clover were 18% and 10% greater than for …

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Deferred Grazing During Summer Increases White Clover Content In New Zealand Dairy Pastures, S L. Harris, C D. Waugh, R J. Mccabe, V T. Van Vught Jul 2024

Deferred Grazing During Summer Increases White Clover Content In New Zealand Dairy Pastures, S L. Harris, C D. Waugh, R J. Mccabe, V T. Van Vught

IGC Proceedings (1993-2023)

NZ dairy pastures under rotational grazing (grazing interval 25 to 30 days) are often grazed down to low residual herbage masses (<1000 kg DM/ha) over summer resulting in white clover death. Deferred grazing, the practice of holding over pasture in situ over summer, was shown to promote survival of clover growing points and increase clover seedling density in mixed perennial ryegrass / white clover dairy pastures. As a result clover content (% of total dry matter (DM)) was increased, particularly in the first year of the trial when summer climatic conditions were unfavourable for clover growth. Additional pasture cover built up in plots deferred for 100 days from late November to March resulted in significantly higher soil moistures and lower soil surface temperatures so providing more favourable growing conditions for clover. Deferred grazing also resulted in small increases in total herbage accumulation but had little effect on ryegrass tiller density.

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Cow-Calf Production Response To Pasture Forage Species, J C. Kopp, W P. Mccaughey Jul 2024

Cow-Calf Production Response To Pasture Forage Species, J C. Kopp, W P. Mccaughey

IGC Proceedings (1993-2023)

To study cow-calf production on fragile soils, 32 ‘tester’ cow-calf pairs were grazed on fertilized and unfertilized meadow brome (Bromus biebersteinii Roem & Schult.) and alfalfa (Medicago sativa L.)/meadow brome pastures, to determine the effects of forage type and fertility on pasture yield and botanical composition; and on animal productivity including cow milk production, cow and calf average daily gain and total gain (per head and per hectare). Cow fertility may be depressed on alfalfa-based pastures, therefore, blood urea nitrogen (BUN) levels were also examined. Cow average daily gain (0.15 kg d-1) and milk production (4.82 kg d-1) …

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Forage Quality, Steer Grazing Performance And Milk Production Using Tifton 85 Bermudagrass Pastures And Conserved Forages, G M. Hill, R N. Gates, J W. West, G W. Burton Jul 2024

Forage Quality, Steer Grazing Performance And Milk Production Using Tifton 85 Bermudagrass Pastures And Conserved Forages, G M. Hill, R N. Gates, J W. West, G W. Burton

IGC Proceedings (1993-2023)

Forage quality and steer performance were determined in a two-year grazing study using replicated .81 ha pastures of Coastal bermudagrass (Cynodon spp.), Tifton 78 and Tifton 85 bermudagrasses. Pastures received 252 kg N/ha annually in three applications. Forage quality of esophageal masticate in July and September indicated that crude protein was higher (P < .05) for all pastures in September than in July. In vitro dry matter disappearance was higher (P < .05) for Tifton 85 than Coastal at both sampling dates. Steer daily gains were similar for the three bermudagrass treatments, but steer gain/ha was higher (P < .10) for Tifton 85 than for Coastal and Tifton 78 pastures. In a dairy cattle experiment (40 cows; 20 Holstein, 20 Jerseys; average 49 days in milk; six-week treatment period), Tifton 85 and alfalfa hay were fed at 15% and 30% of dietary DM, substituted for corn silage in total mixed diets. Cows consumed more DM when offered alfalfa hay than Tifton 85 hay diets (21.2 vs 19.1 kg/day, P < .01), had higher DM intake on low than high hay diets (20.4 vs 19.9 kg/day, P <.10) and had higher DM intake on the control silage-based diet than on hay diets (21.1 vs 20.1 kg/day, P < .05). Average daily milk yield and 3.5% fat corrected milk yield followed trends similar to DM intake for forage source and hay level in diets. Tifton 85 bermudagrass produced higher gains in beef steers than two other cultivars, and Tifton 85 hay has potential for utilization in dairy diets.

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Extensive Management Of Grasslands In Central France: Effects On Animal Performances And Economical Efficiency, J M. Chabosseau Jul 2024

Extensive Management Of Grasslands In Central France: Effects On Animal Performances And Economical Efficiency, J M. Chabosseau

IGC Proceedings (1993-2023)

The farming context for livestock production has changed in Central France for the last 15 years. There has been a release of land and a change in financial support that favoured extensive systems. The management and economical results of two experimental sheep farmlets are compared; the extensified has an area 45% larger than the control but the number of ewes are the same. The optimization of managements in both units leads to practices rather different for fertilising, fodder making and grazing. The effects are the achieving of similar animal performances and the reduction of expenditure on grasslands (-30% per ewe) …

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The Effect Of Period Of Stay On The Productivity Of Pasture Beef Systems, R C. Martin, A H. Fredeen, N Boyd, Y A. Papadopoulos, E Charmley Jul 2024

The Effect Of Period Of Stay On The Productivity Of Pasture Beef Systems, R C. Martin, A H. Fredeen, N Boyd, Y A. Papadopoulos, E Charmley

IGC Proceedings (1993-2023)

The objective of this study was to compare the average daily gains (ADGs) of beef cattle under management intensive grazing in paddocks with one-day and six-day periods of stay and to assess yellow fat on carcasses of cattle finished on pasture. The ADGs over the season were higher under the one-day than the six-day period of stay in 1994, but in 1995, the opposite trend was evident although the differences were not significant. In 1995, none of the 32 cattle tested were downgraded for the presence of yellow fat.

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Stockpiling Systems: Evaluation Of Management Strategies Under Clipping And Sheep Grazing, J E. Johnston Jul 2024

Stockpiling Systems: Evaluation Of Management Strategies Under Clipping And Sheep Grazing, J E. Johnston

IGC Proceedings (1993-2023)

Two studies were carried out to examine the role of initiation date, utilization date, grass species, and nitrogen application on the yield and quality of stockpiled pasture. Experiment 1 involved 5 grass species managed under two pre-stockpiling harvest systems in replicated small plots harvested at each of three dates in autumn. Experiment 2 involved two summer initiation dates and two rates of N application on mixed swards grazed by sheep. Both experiments showed that stockpiled forage yields decreased by 52% to 75% as stockpile initiation date was delayed from early July to mid-August. Forage crude protein content increased by 1.7% …

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Native Pasture Forage On Offer And Animal Response, G E. Maraschin, E L. Moojen, C.M D. Escosteguy, F L. Correa, E S. Apezteguia, L L. Boldrini, J Riboldi Jul 2024

Native Pasture Forage On Offer And Animal Response, G E. Maraschin, E L. Moojen, C.M D. Escosteguy, F L. Correa, E S. Apezteguia, L L. Boldrini, J Riboldi

IGC Proceedings (1993-2023)

The 5-yr. study on the native pasture of southern Brazil (30o S) under levels of dry matter on offer (DMO) and continuous stocking, with five tester steers plus the put-and-takers per pasture and two field replications, indicated dry matter residues as dependent on DMO. Dry matter (DM) yield increased with DM residues, as well as dead plant parts. Daily liveweight gains (DLG) and gain ha- 1 showed a curvilinear response to DMO and DM residues. Forage on offer levels promoting selective grazing enhance higher DLG and sustainable G. ha-1, and contributes to the well-being of the ecosystem.

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Pasture Species Effects On Animal Performance, T J. Fraser, S=J S. Rowarth, T L. Knight Jul 2024

Pasture Species Effects On Animal Performance, T J. Fraser, S=J S. Rowarth, T L. Knight

IGC Proceedings (1993-2023)

Increasing concerns about food quality have resulted in investigations into the effects of different forage species on animal production and carcass quality. Pure species plots of high-endophyte ryegrass (Lolium perenne L.), white clover (Trifolium repens L.), chicory (Cichorium intybus L.), plantain (Plantago lanceolata L.) or lotus (Lotus corniculatus L.) were established and lambs grazed the species for 120 days during summer. Pasture species influenced growth rate, hot carcass weight, GR, wool growth, faecal egg counts, adult nematodes at slaughter, and sheep meat odour and flavour. Lambs grazing white clover, lotus or chicory outperformed those grazing …

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Grazing Affects Pest And Beneficial Invertebrates In Australian Pastures, P J. Michael, M Grimm, M Hyder, P T. Doyle Jul 2024

Grazing Affects Pest And Beneficial Invertebrates In Australian Pastures, P J. Michael, M Grimm, M Hyder, P T. Doyle

IGC Proceedings (1993-2023)

Grazing annual subterranean pastures in Western Australia to targeted levels of pasture mass, instead of at a set stocking rate, affected numbers of invertebrates at the commencement of the following season. Treatments were controlled grazing to 1.4 t ha-1 or 2.8 t ha -1 dry weight of green pasture and set stocking at the average for the district. Grazing reduced numbers of redlegged earth mite, Halotydeus destructor, but increased numbers of lucerne flea, Sminthurus viridis. The most likely reason for the reverse effect on lucerne flea was the presence of an effective predator, the pasture snout mite, Bdellodes lapidaria …

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The Effect Of Stocking Rate On Herbage Utilization And Milk Production Under Time-Restricted Grazing By Lactating Dairy Cows, M Okubo, I Nonaka, K Furukawa, H Nakatsuji, S Kondo Jul 2024

The Effect Of Stocking Rate On Herbage Utilization And Milk Production Under Time-Restricted Grazing By Lactating Dairy Cows, M Okubo, I Nonaka, K Furukawa, H Nakatsuji, S Kondo

IGC Proceedings (1993-2023)

The effect of two stocking rates of 5 (L) and 7 (H) heads of lactating dairy cows per hectare on herbage utilization and milk production were determined under a time-restricted grazing during 2 years from 1993 to 1994. The annual herbage utilization and milk production from pasture in 1993 were lower in H than L (herbage, 7.9 vs. 9.1tDM/ ha; milk, 8.1 vs. 9.6t/ha) since the days of grazing cycle was considerably shorter in H than L (7.8 vs. 17.1days). As a result of changing the expected daily herbage intake per head of H seasonally in 1994, the annual herbage …

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The Relationship Of Grazing Conditions To Annual Changes Of Sward Characteristics And Herbage Utilization By Lactating Dairy Cows In The Snowy, Cold Region In Japan, H Nakatsuji, I Nonaka, S Kondo, M Okubo Jul 2024

The Relationship Of Grazing Conditions To Annual Changes Of Sward Characteristics And Herbage Utilization By Lactating Dairy Cows In The Snowy, Cold Region In Japan, H Nakatsuji, I Nonaka, S Kondo, M Okubo

IGC Proceedings (1993-2023)

In order to determine the relationship of grazing conditions to annual changes of sward characteristics and herbage utilization in the snowy, cold region in Japan, the data for pasture utilization of dairy cows under a time-restricted grazing on Experimental Farm, Hokkaido University, from 1984 to 1992 were used for analyses. An annual herbage utilization did not always decrease though legume crown coverage declined gradually with advancing years after swardestablishment. The annual herbage utilization (tDM/ha, Y) increased with increasing the stocking rate (cow-hr/ha, X) (Y=0.00136X-0.685, r=0.752**).

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