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Articles 571 - 600 of 12002
Full-Text Articles in Physical Sciences and Mathematics
Characteristics Of Grass Species In Pasture For High Producing Cows In Northern Japan, K Sudo, K Ochiai, T Ikeda
Characteristics Of Grass Species In Pasture For High Producing Cows In Northern Japan, K Sudo, K Ochiai, T Ikeda
IGC Proceedings (1993-2023)
The prupose of this research was to investigate characteristics of grass species under different conditions appropriate to the intensive grazing system for high producing cows (8000 kg for a 305-day lactation) in northern Japan. Meadow fescue (Festuca elatior L.), timothy (Phleum pratense L.) and perennial ryegrass (Lolium perene L.) white clover (Trifolium repens L.) pastures were established and divided into two plots by difference of regulated plant height (meadow fescue and timothy) or of stocking intensity (perennial ryegrass). Each plot was 60m2 and was grazed when plant height reached 20cm or 30cm. Meadow fescue and perennial …
Live-Weight Gain Of Steers Grazing African Star Grass Four Herbage Allowances, J Perez-Perez, J O. Hernandez-Velez, J G. Herrera-Haro, R Barcena-Gama
Live-Weight Gain Of Steers Grazing African Star Grass Four Herbage Allowances, J Perez-Perez, J O. Hernandez-Velez, J G. Herrera-Haro, R Barcena-Gama
IGC Proceedings (1993-2023)
The objective was to determine weight changes of steers grazing African star grass (Cynodon plectostachyus) at four herbage allowances (2.0, 2.5, 3.0 and 3.5 kg of dry matter/100 kg of live weight day-1). A rotational grazing system with 10 grazing days and 30 days rest was followed. A Split Plot Design with four replications was used. Response variables were: daily gain per steer (DGS) and per hectare (DGH), dry matter forage yield (FY), % of utilization (% U) and in vitro dry matter digestibility (DMIVD). DGS and DGH were not different (P >0.05) among allowances and grazing periods. …
Strategic Use Of Brachiaria Decumbens Pasture To Beef Heifers During Dry Season, E G. Cardoso, N F. Seiffert, J Marques Da Silva, V.P. B. Euclides, J M. Vieira
Strategic Use Of Brachiaria Decumbens Pasture To Beef Heifers During Dry Season, E G. Cardoso, N F. Seiffert, J Marques Da Silva, V.P. B. Euclides, J M. Vieira
IGC Proceedings (1993-2023)
The main objective of this study was to evaluate a Brachiaria decumbens pasture, instead of a common rangeland, for zebu beef heifers during the dry season of the year as a means of anticipating the first calving age from four to three years of age, and so improve the production rate of the herd. Daily liveweight gains (DLWG) were analyzed for the effects of year and three stocking rates during the dry season (SR1=1.5; SR2=2.0 and SR3=2.5 head/ha). The main effect on heifers DLWG was the year (P<0.01), but SR was also important (P<0.05), mainly during the last half of the dry season when pastures are under severe constraints such as soil moisture deficit and low temperatures. The lowest SR presented the highest DLWG (0.204a, 0.174ab and 0.145b kg/head, respectively for SR1, SR2 and SR3), during the dry season. If climatic conditions are not exceptionally bad, heifer first calving occurs at 37 months of age when reared on B. decumbens.
Quality Grassland For Dairy Production In North-West Spain, A Gonzalez-Rodriguez
Quality Grassland For Dairy Production In North-West Spain, A Gonzalez-Rodriguez
IGC Proceedings (1993-2023)
An experiment with two groups of 15 Friesian cows grazing independent areas, with no N and 240 kg N ha-1, was run during two years to see the levels of milk production based on a grass/white clover pasture, maintaining high levels of herbage quality. N application decrease clover content from 55% to 42%. The total DM response to N was low. Herbage utilization was maintained similar in both treatments. Moderate levels of milk production can be reached, more than 4000 litres cow-1 and 9000 litres ha-1, with low use of concentrates, only 400 kg cow-1. Crude protein levels were high …
Sward Height On The Performance Of Cow-Calf Units And Yearling Steers Grazing Cool Season Pasture, E C. Prigge, W B. Bryan, E L. Nestor
Sward Height On The Performance Of Cow-Calf Units And Yearling Steers Grazing Cool Season Pasture, E C. Prigge, W B. Bryan, E L. Nestor
IGC Proceedings (1993-2023)
Performance and grazing time of cow-calf units and yearling steers were determined over four years on naturalized cool season pastures maintained at a sward height of 4-6, 6-8, 8-10, or 10-12 cm. Daily gains of cows and steers responded quadratically (P<0.05) to increasing sward heights, with gains maximized at 8-10 cm. Milk production of the cows and gain of the calves were not affected (P>0.10) by sward height. Grazing days (cow-calf unit/hectare) decreased linearly (P<0.01) with increasing sward height. The proportion of the day spent grazing for cows and steers decreased in a linear manner (P<0.05) as pasture height increased. Cows spent less time grazing than steers (P<0.05) at all but the low pasture height.
Buffer Grazing For A Twelve Month Cow-Calf Production System, W B. Bryan, E C. Prigge, D J. Flaherty, G E. D'Souza
Buffer Grazing For A Twelve Month Cow-Calf Production System, W B. Bryan, E C. Prigge, D J. Flaherty, G E. D'Souza
IGC Proceedings (1993-2023)
Set stocking is a widely used grazing management for beef cow-calf production on Appalachian hill land pastures of the USA. A replicated study was conducted to compare a conventional (set stocking) and buffer grazing management. For the buffer system, grazing area was restricted in the spring and hay was harvested from the ungrazed area. In summer, a portion of this area (buffer) was grazed and a second cutting of hay removed from the remaining area. For the conventional treatment a fixed area was set stocked and hay was harvested on an area designated for hay only. Land areas and fertilizer …
Intensive Rotational Grazing Systems For Dairying In A Subtropical Environment: Animal, Plant, And Soil Responses, J H. Fike, C R. Staples, L E. Sollenberger, D A. Graetz
Intensive Rotational Grazing Systems For Dairying In A Subtropical Environment: Animal, Plant, And Soil Responses, J H. Fike, C R. Staples, L E. Sollenberger, D A. Graetz
IGC Proceedings (1993-2023)
Forage species, stocking rate, and supplementation rate effects upon performance of lactating dairy cows were studied. Forage mass and nutritive value and nutrient concentration in shallow groundwater also were measured. Cows (n = 44) grazed bermudagrass (Cynodon dactylon) or rhizoma peanut (Arachis glabrata), stocked at 4.9 or 7.4 cows ha-1, and 2.5 or 4.9 cows ha-1, respectively. Pelleted concentrate:whole cottonseed (80:20) was offered twice daily post milking at 1 kg per 2 or 3 kg of daily milk production. Cows grazing rhizoma peanut produced more (P = .076) milk per day but had greater (P = …
High Moisture Corn Supplementation Of Different Dry Matter Content To Cows Grazing Temperate Pasture, D H. Rearte, H Alvarez, F Santini
High Moisture Corn Supplementation Of Different Dry Matter Content To Cows Grazing Temperate Pasture, D H. Rearte, H Alvarez, F Santini
IGC Proceedings (1993-2023)
The objective of this study was to evaluate grazing dairy cows performance supplemented with high moisture corn of different dry matter content. Cows grazed fresh forage oat day and night and received 5 kg DM high moisture corn daily. Treatments 1 and 2 were high moisture corn of 30% and 18% moisture content respectively. Twenty Holstein cows were used for milk production and composition studies and six rumen fistulated cows were used for rumen digestion studies. Milk production and composition and body weight gain were not affected by the dry matter content of the supplemented high moisture corn. Related to …
Intake Of High Producing Holstein Cows Grazing Pasture Or Fed A Total Mixed Ration, E S. Kolver, L D. Muller
Intake Of High Producing Holstein Cows Grazing Pasture Or Fed A Total Mixed Ration, E S. Kolver, L D. Muller
IGC Proceedings (1993-2023)
The ability of a pasture diet to support a high dry matter intake without supplementary feed was determined using 16 high producing Holstein cows. Cows (n=8) were adapted to an all-pasture diet by incrementally reducing the amount of total mixed ration (TMR) fed over four weeks. A control group of cows (n=8) remained in confinement and were fed a TMR. Performance of grazing cows differed significantly (P < 0.001) from TMR fed cows by intake (19.0 vs. 23.4 kg DM/d), milk production (29.6 vs. 44.1 kg/d), milk protein content (2.61 vs. 2.80%), liveweight (562.1 vs. 597.3 kg), and condition score (2.02 vs. 2.50). Results indicate that intake of good quality pasture is higher than previously estimated for high producing Holstein cows in the USA, but that milk production is 15 kg/d less than when cows are fed a TMR.
Cattle Production And Botanical Composition In Continuously Stocked Grass-Clover Swards, A Elgersma, H Schlepers
Cattle Production And Botanical Composition In Continuously Stocked Grass-Clover Swards, A Elgersma, H Schlepers
IGC Proceedings (1993-2023)
The performance of grass-clover mixtures was evaluated under cattle grazing, and the relations between grass variety, clover content and animal production were studied during four years at three locations. The prostrate diploid perennial ryegrass variety formed a dense sward with less clover and less weeds than the tetraploid or the erect diploid ryegrass varieties, which contained about the same amount of clover in the mixture. The ryegrass tiller density was lowest in the tetraploid. These differences between mixtures were not reflected in differences in animal performance or net energy production.
Production Efficiency Benchmarks For Irrigated Dairying In South Eastern Australia, K E. Pritchard, O A. Gyles, D P. Armstrong, S L. Spiteri
Production Efficiency Benchmarks For Irrigated Dairying In South Eastern Australia, K E. Pritchard, O A. Gyles, D P. Armstrong, S L. Spiteri
IGC Proceedings (1993-2023)
Milk production from grazed irrigated pasture is an important industry in south eastern Australia. Irrigation water is essential for perennial pastures, but the efficiency with which the irrigation water is used to produce milk varies widely between farms. As irrigation water is a limiting resource, future productivity increases will depend on increasing the amount of milk produced per unit of water applied. This research project estimates metabolisable energy utilised from grazed pasture, using energy values for animal requirements, products and feedstuffs. Efficiency criteria, in terms of production per hectare of irrigated pasture, per megalitre of irrigation water, and per cow …
Grazing Management And Nitrogen Fertilizer Effects In Grazing Systems For Beef Cows, D G. Morrison, C C. Willis, D L. Castle, G J. Cuomo
Grazing Management And Nitrogen Fertilizer Effects In Grazing Systems For Beef Cows, D G. Morrison, C C. Willis, D L. Castle, G J. Cuomo
IGC Proceedings (1993-2023)
Four 8-ha areas, primarily Cynodon dactylon forage, were overseeded in autumn with annual ryegrass (Lolium multiflorum) and clover (Trifolium incarnatum and Trifolium repens). Two areas received no nitrogen (N) fertilizer and two received 168 kg N/ha annually. Within N level (2 x 2 factorial), one area was divided into 4 paddocks (pad) and the other into 16 pad for rotational grazing. Spring-calving beef cows were stocked (2.5/ha) year-round on each area with calves weaned in October. Annual dry matter forage accumulation was greater where N was applied (18.2 vs 14.2 Mg/ha, P=.02) but was unaffected by …
Sheep Production On An Annual And Perennial Pasture In Southwest Australia, P Sanford, J Gladman, L Cransberg
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 …
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
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 …
Intensive Grazing Management For Dairy Heifers, J R. Rodgers
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.
Pasture Production And Weaned Heifer Performance From Tropical Grasses, P Mislevy, F M. Pate, F G. Martin, L M. Rutter
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 …
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
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 …
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
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 …
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
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. …
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
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.
Influence Of Grazing Management Of Autumn Soil Water Deficit Below Perennial Grass Pastures, C A. Clifton, P M. Schroder, J F. Graham
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 …
The Effect Of Seasonal Deferred Grazing On Porto Cocksfoot, R P. Thompson, A Avery
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, …
The Effect Of Seasonal Deferred Grazing On Phalaris (Phalaris Aquatica) In Temperate Australia, A L. Avery, J F. Graham
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 …
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
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 …
Milk Production And Feed Intake At Different Stocking Rates In An Intensive Grazing System, Y Togamura, K Ochiai, S Shioya, K Otsuki
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 …
Pasture Heterogeneity Created By Grazing Of Cattle Biotypes With Different Body Size, M S. Cid, M A. Brizuela, M S. Aello, C Ferri
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 …
Forage Productivity And Animal Performance On Different Grass/Legume Pastures For Grazing Management, Sung Seo, Joung Kyong Lee, Dong Eun Shin
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 …
Effects Of Regrowth Interval In The Autumn On Growth Of Grass In The Autumn/Winter Period, Edward G. O'Riordan
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.
Beef Production From Grazed Grass And Grass/Clover Swards, Edward G. O'Riordan
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.
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
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 …