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Articles 571 - 600 of 302419

Full-Text Articles in Physical Sciences and Mathematics

Influence Of Ectoparasites On Ingestive And Meristic Behavior Of Grazing Beef Cattle, C T. Dougherty, F W. Knapp, P B. Burrus, N W. Bradley Aug 2024

Influence Of Ectoparasites On Ingestive And Meristic Behavior Of Grazing Beef Cattle, C T. Dougherty, F W. Knapp, P B. Burrus, N W. Bradley

IGC Proceedings (1993-2023)

Face flies (Musca autumnalis De Geer) and slable flies (Stomoxys calcitrans L.) were raised in the laboralory and released into 12 enclosures, each with I grazing cow (Bos taurus L.). Releases of 0, 400 and 800 face flies gave 3, 53 and 64 lighted flies/cow, respectively, with 30/head al the 400 and 800 levels, and eliciled head (2, 60 and 39/h), ears (8, 1337 and 859/h), tails (24, 191 and 606/h) movements and skin twitches (1 side) (15, 210 and 248/h) but did not induce leg movements or affect number of feeding stations visited (188/h), Face flies …

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Dung Bags To Prevent Dung Pat Formation In Pasture By Grazing Cattle, Sakurai Mosaku Aug 2024

Dung Bags To Prevent Dung Pat Formation In Pasture By Grazing Cattle, Sakurai Mosaku

IGC Proceedings (1993-2023)

In order to prevent dung pat formation on intensively grazed pasture in the humid temperate zone, a modified dung bag was made. Results from a preliminary study showed that smaller dung lumps dropped in the pasture resulted in the period of rejection being shorter and the rejected area being smaller or non existent. The dung bag was remodeled and fitted to the milking cows. After excretion the dung is held in the dung bag. From a hole in the bottom of the bag smaller dung lumps fall to the pasture. Therefore larger dung pat formation is prevented and the area …

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Vegetation Utilization And Dynamics In Hill Pastures Dominated By Calluna Or Agrostis-Festuca-Nardus And Grazed By Sheep Or Cattle, R Celaya, M Olivan, K Osoro Aug 2024

Vegetation Utilization And Dynamics In Hill Pastures Dominated By Calluna Or Agrostis-Festuca-Nardus And Grazed By Sheep Or Cattle, R Celaya, M Olivan, K Osoro

IGC Proceedings (1993-2023)

The dynamics of Agrostis-Festuca-Nardus. grasslands and Calluma heathlands with broom on plots with different ratio of area covered by each community type and grazed either by cattle or sheep were monitored during summers of 1990 and 1991. Significant differences were observed. Cattle grazed Nard11s more intensively than sheep and Cai tuna cover . was more, slrongly affected by cattle than sheep grazing. Brooms were grazed intensively by sheep but were rejected by cattle.

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Diet Selection, Diet Quality, Dry Matter Intake And Growth Rate Of Cattle Grazing Tropical Grass-Legume, D B. Coates, A J. Ash, R W. Mclean Aug 2024

Diet Selection, Diet Quality, Dry Matter Intake And Growth Rate Of Cattle Grazing Tropical Grass-Legume, D B. Coates, A J. Ash, R W. Mclean

IGC Proceedings (1993-2023)

Dietary attributes and growth of cattle grazing tropical grass-legume pastures were ex.amined in 2 experiments in northern Queensland. Pastures oversown with legume gave substantial improvements in dietary ,nitrogen, digestibility and dry mauer intake compared with native 1rass pasture. On phosphorus (P)-deficient soils, applying P fertiliser or supplementing with P, improved P jntake, feed intake and growth rate of .cattle. Once nitrogen and P deficiencies were overcome, it was com:luded that diet digestibility was the main factor limiting the growth. of cattle and that the severity of this limitation was determined primarily by seasonal conditions.

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Variation In Intake Rate And Mastication By Grazing Steers In The Spring, G P. Cosgrove, J C. Burns, D S. Fisher, K R. Pond, J P. Mueller Aug 2024

Variation In Intake Rate And Mastication By Grazing Steers In The Spring, G P. Cosgrove, J C. Burns, D S. Fisher, K R. Pond, J P. Mueller

IGC Proceedings (1993-2023)

Changes in intake ,ate (IR), bite mass (BM), and biting rate (BR) and ingestive mastication of tall fescue (Festuca arundinacea Schrcb; TF), orchardgrass (Dactylis glomerata L; OG) and ryegrass (Lolium perenne L: RG) were studied over 3 grazings between early spring and early summer of 2 consecutive years. Defoliation by steers started at 100 mm canopy height (Tl) and terminated at 50 mm (T2). At Tl, and again at T2, ocsophageal-fistulated steers were used to estimate IR, BM and BR and to provide extrusa samples for determination of 1nasticatc particle size after dry sieving. At Tl there …

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Varietal Differences In The Heifer Preference Of Orchardgrass, K Mizuno, S Shioya, F Fujimoto, M Kanbe Aug 2024

Varietal Differences In The Heifer Preference Of Orchardgrass, K Mizuno, S Shioya, F Fujimoto, M Kanbe

IGC Proceedings (1993-2023)

Heifer preferences of 14 varieties of orchardgrass (Dactylis glomerata L.) were studied using a tough cafeteria method throughout the growing season in 1991. Highly significant differences in heifer preferences between varieties were recognised through the 1st harvest in April to the 6th harvest in November. Several agronomic characters were negatively correlated with heifer preferences in each harvest: stage of maturity in the spring growth, occurrence of rhynchosporium scald (Rhynchosporium ortliosporum Caldwell) in the summer regrowth in July and of stem rust (Puccinia graminis Pers, f. sp. dactylitis Guyot and Massenot) in the autumn regrowth. However, leaf flexibility was …

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Comparison Of Bite Weight And Bite Dimensions Of Sheep And Goats Grazing A Range Of Grasses And Clovers, Y Gong, J Hodgson, M G. Lambert, A.C P. Chu, I L. Gordon Aug 2024

Comparison Of Bite Weight And Bite Dimensions Of Sheep And Goats Grazing A Range Of Grasses And Clovers, Y Gong, J Hodgson, M G. Lambert, A.C P. Chu, I L. Gordon

IGC Proceedings (1993-2023)

Response patterns in bite weight and bite dimensions of sheep and goats were evaluated using 3 grasses and 3 clovers sampled at 2 stages of maturity offered as prepared turves to animals confined in metabolism crates. Average bite weight across 12 sward types (6 forages x 2- stages) was similar for sheep and goats, but goats had greater bile weight per unit LW0•75 tlian sheep, Despite being shorter, the much denser clover swards resulted in larger bite weight than did grass swards. The taller reproductive swards enabled animals to harvest greater bite weights than did vegetative swards. Sheep obtained heavier …

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Influence Of Sward Characteristics On The Diet Selected By Grazing Sheep In Perennial Ryegrass Swards Maintained At Two Sward Heights, H Clark Aug 2024

Influence Of Sward Characteristics On The Diet Selected By Grazing Sheep In Perennial Ryegrass Swards Maintained At Two Sward Heights, H Clark

IGC Proceedings (1993-2023)

Perennial ryegrass (Lolium perenne L.) swards were continuously but variably stocked to maintain a sward surface height (SSH) of either 4 cm or 3cm for 2 grazing seasons (1983, 1984). The lower sward height resulted in less length of leaf per tiller but this was balanced by a higher tiller population such that there were only small differences between the swards in green leaf mass per ha. In 1984 the green tissue ai1d the green leaf mass increased on both swards despite there being no change in the average sward height. This was due to an increased length of material …

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Relationship Between Sward Structure And Dietary Quality And Intake, In Cattle Grazing Humid Sour Grassveld In South Africap, P J. O'Reagain, M Haller, P.J K. Zacharias Aug 2024

Relationship Between Sward Structure And Dietary Quality And Intake, In Cattle Grazing Humid Sour Grassveld In South Africap, P J. O'Reagain, M Haller, P.J K. Zacharias

IGC Proceedings (1993-2023)

The relationship between sward structure, and dietary quality and intake was investigated for cattle grazing humid sour grassveld in south Africa. A 2-ha site was divided into 6 equal-sized blocks with; each block being managed to achieve a different sward structure using rotation·a1 grazing of cattle at 3, 5, 8, 11, 16 or 20 week intervals. Before to grazing, sward structure was quantified in terms. of tuft height, leaf table height, stemminess and greenness of the 3 most abundant species as well as sward leaf density. Oesophageal i fistulates were used to estimate dietary quality, bite rate, bite size, and …

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Bite And Bolus Size Of Japanese Black Cattle Grazing Trays Of Perennial Ryegrass Of Different Heights, Shigeru Shioya, Kazuhiko Ochiai, Yasuko Togamura, K Betteridge Aug 2024

Bite And Bolus Size Of Japanese Black Cattle Grazing Trays Of Perennial Ryegrass Of Different Heights, Shigeru Shioya, Kazuhiko Ochiai, Yasuko Togamura, K Betteridge

IGC Proceedings (1993-2023)

To determine the influence of grass .height on ingestive behaviour of Japanese Black cattle, bite size and bolus size of a Japanese Black heifer (230 kg body weight) and a Japanese Black cow (450 kg body weight) were estimated on perennial ryegrass (Lolium pere,me L.) turfs. Turfs in trays (460x600xl00 mm) were fed to the cattle for up to 3 min and reductions in turf weight were measured. One high (25 cm), 2 medium (13 cm) and 2 low (6 cm) turfs were offered to each animal. Bite size (dry matter intake/bite) both for the heifer and cow was greatest …

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Comparison Of The Grazing Habits Of Japanese Black And Holstein Steers On Semi-Natural And Improved Pastures In Japan, Akihisa Yamada, Hiroshi Dohi, Shigeki Entsu Aug 2024

Comparison Of The Grazing Habits Of Japanese Black And Holstein Steers On Semi-Natural And Improved Pastures In Japan, Akihisa Yamada, Hiroshi Dohi, Shigeki Entsu

IGC Proceedings (1993-2023)

The grazing habit of 6 Japanese Black and 6 Holstein steers was compared on semi-natural pasture and improved perennial ryegrass­white clover (Lolium perenne-Trifolium repens pasture in Japan. Japanese Black steers spent less time eating than Holstein steers on improved pasture. The ratio of walking while eating to total walking distance was lower for Japanese Blacks than for Holsteins, On the semi-natural pasture, Japanese Blacks .spent more time grazing than Holsteins and Japanese Blacks walked faster than Holsteins. On semi­natural pasture, Japanese Blacks picked upper leaves always walking forward.

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Botanical Composition Dynamics And Herbage Mass In Pasture Mixtures In The Mountainous Regions Of Guizhou Province, China, W L. Jiang, A. C P. Chu, J Z. Ren Aug 2024

Botanical Composition Dynamics And Herbage Mass In Pasture Mixtures In The Mountainous Regions Of Guizhou Province, China, W L. Jiang, A. C P. Chu, J Z. Ren

IGC Proceedings (1993-2023)

Competition is a major cause of changes in the botanical composition and yield of pastures. Species that are compatible with each other do not utilise the same resources at the same time and therefore suffer less competition. Selecting compatible species in a mixture could thus enhance the yield and stability of the sward. The objective of this experiment was to compare the yield and botanical composition of a range of pasture species sown in simple or complex mixtures. Complex mixtures of more than 2 species tended lo outyield simple mixtures, and swards with perennial ryegrass (Lolium perenne) tended …

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Grazing Behavior Of Beef Cattle During First-Time Exposure To A Pearl Millet Pasture Treated With A Chemical Plant-Growth Regulator, J E. Arias, C T. Dougherty, M Collins Aug 2024

Grazing Behavior Of Beef Cattle During First-Time Exposure To A Pearl Millet Pasture Treated With A Chemical Plant-Growth Regulator, J E. Arias, C T. Dougherty, M Collins

IGC Proceedings (1993-2023)

Twelve tethered Angus cows were used to estimate 1he effect of structure and chemical composition of a pearl millet (Pennisetum americanum L. Leeke cv, Tifleaf-.2. hybrid) pasture.on grazing. behaviour. Cerone­ (ethephon (2-chloroethyl) phosphonic acid) plant growth retardant (fOR) was broadcast, establishing canopy heights of 0.855, 0.716 and 0,829 m;• neutral detergent fibr􀁋 (NDP) of 65,3, 63 .. 4 ·and 64.91/'; acid detergent • fibre (ADF) of 37.6, 36.2 and,37.5%: and in vitro organic .matter digestibility (lVOMD) of 66.4, 67 .9 and 66.9% (Treatment 1. (Tl), T2 and ·T3, respectively). ·Effective biting rate (BBR) averaged 24, 28 an!l 25 bites/min …

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Atmospheric Sulpher Inputs In Rainfall In Southern New Zealand, C C. Boswell, W H. Risk, R J. Littlejohn Aug 2024

Atmospheric Sulpher Inputs In Rainfall In Southern New Zealand, C C. Boswell, W H. Risk, R J. Littlejohn

IGC Proceedings (1993-2023)

Rainfall was collected from 53 sites, arranged in 5 transects across the southern lowlands of the South Island of New Zealand, over a 12-month period. Atmospheric sulphur (S) inputs· in rainfall ranged from l to 38 kg S/ha/annum, Close correlation of sulphate and chloride· showed most of the S was of marine origin. S inputs were highest at the coast and declined inland linearly with the log of distance from the coast, with different intercept parameters between transects. This reflected different amounts of protection from the prevailing south­westerly (SW) weather between transects. SW rainfall delivered most S and sites exposed …

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Improvement Of Grass-Dominated Swards By Sod-Seeding In Eastern Hokkaido, Japan, Yoshihiko Takeda Aug 2024

Improvement Of Grass-Dominated Swards By Sod-Seeding In Eastern Hokkaido, Japan, Yoshihiko Takeda

IGC Proceedings (1993-2023)

Introduction of forage legumes into grass-dominant swards by sod­seeding may greatly improve vegetation and herbage production. Two field experiments were carried out to introduce red clover (Trifolimn pratense L.) into timothy (Phleum pratense L.)-dominant swards by the cultivation of sward surface without chemical suppression of existing timothy: I) Cultivation of the whole grassland (A) with rotary-harrow or disc-harrow or the partial cultivation (B) with slot-seeder, using John Deere PowrTillseeder or Hunter Rotary strip seeder, provided satisfactory seed-bed forsod-seeded clover, 2) Suppression effects on existing timothy by cultivation treatments influenced the establishment of sod-seeded clover, and effects varied …

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Improvement Of Red Clover Persistence In Japan, Hidekazu Yamaguchi, Akira Sawai, Kazuhiro Uchiyama Aug 2024

Improvement Of Red Clover Persistence In Japan, Hidekazu Yamaguchi, Akira Sawai, Kazuhiro Uchiyama

IGC Proceedings (1993-2023)

Two new cultivars Hokuseki and Taisetsu of red clover (Trifolium pratense L.) were selected for disease tolerance and high vigour in the third year of growth to improve persistence. This· paper compares persistence of the cultivars with that of·Sapporo, a check cultivar, and elucidates what determines the persistence of the cultivars. Five-year tests showed that Hokuseki and Taisetsu yielded higher than Sapporo in later years. The cultivars were more tolerant than Sapporo, to Sclerotinia trifoliorum and some other diseases. These results suggest that selection for high vigour in the third year under snowy conditions was effective. in selecting for persistence …

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Rapid Wilting With A Large Scale Forage Mat Maker, P Savoie, D Tremblay, R Michaud Aug 2024

Rapid Wilting With A Large Scale Forage Mat Maker, P Savoie, D Tremblay, R Michaud

IGC Proceedings (1993-2023)

Forage mat making is a process that combines 4 operations in a single machine: mowing the fresh crop, maceration with grinding rolls, compression of the mashed forage into a thin mat and deposition on the stubble for natural air drying. A large-1cale forage mat maker was recently built by our research group in Canada. It incorporates a 2.1 m wide mower, 8 seraced rolls 1.5 m wide and a belt press system' producing a continuous mat 1.2 m wide. The prototype was used to · evaluate wilting of lucerne in field conditions. Matted lucerne initially at 81 % moisture reached …

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Performance Of Subterranean Clover Int He Central Andes Of Peru, Brigitte L. Maass, Custodio L. Bojorquez Aug 2024

Performance Of Subterranean Clover Int He Central Andes Of Peru, Brigitte L. Maass, Custodio L. Bojorquez

IGC Proceedings (1993-2023)

The central Andes of Peru are characterised by moderately acid soils, a pronounced dry season of 4-5 months and temperatures that decrease as night frosts increase with altitude. Above an altitude of 3200 m asl, the proportion of pastures in land use increases. However, native pastures lack sufficient quality and quantity to maintain· animal production, particularly in the dry season. Where irrigation is not available, introducing annual legumes may be an option to improve native pastures. In a trial to test adaptation of subterra.nean clover (Trifolium subterraneum L.), 5 Australian cultivars were sown at 4 different altitudes between 3300 …

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Breeding Italian Ryegrass For A Heavy Snowfall Area In Japan, Improving The Two Aspects Of Snow Endurance, Makoto Kobayashi, Kazuhiro Tase, Tomoyuki Yukawa, Katsuo Egara Aug 2024

Breeding Italian Ryegrass For A Heavy Snowfall Area In Japan, Improving The Two Aspects Of Snow Endurance, Makoto Kobayashi, Kazuhiro Tase, Tomoyuki Yukawa, Katsuo Egara

IGC Proceedings (1993-2023)

in parts of Japan, snow endurance is the most critical factor for winter crop production. To overcome the problem, a breeding , programme of Italian ryegrass (Lolium multiflorum Lam.) was started In 1962 and led to the release of the tetraploid variety Miyukiaoba, which has an extremely high level of snow endurance. It is shown· that snow, endurance has resulted from the resistance to snow mold; disease, especially Pythium paddicum and Typhula incarnata. Accumulation of fructan (fructose polymer) also plays an important role in survival under snow. This study demonstrates the relationship of the 2 aspects to snow …

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Early And Late Grazing Of Cocksfoot And Tall Fescue Hay Fields Overseeded With Red Clover, E C. Prigge, W B. Bryan, E S. Goldman, G E. D'Souza Aug 2024

Early And Late Grazing Of Cocksfoot And Tall Fescue Hay Fields Overseeded With Red Clover, E C. Prigge, W B. Bryan, E S. Goldman, G E. D'Souza

IGC Proceedings (1993-2023)

Grazing hay fields with beef cattle during portions of the year when hay is traditionally fed, was examined to yield, quality of forage and composition of the sward. Pour managements were compared: early spring, one hay cutting, and late autumn grazing (GHG), 2 hay cuttings (HH), early spring grazing and 2 hay cuttings (GHH), and 1 hay culling and late au1umn· grazing (HG). The managements were applied lo tall foscue (Festuca arundinacea Schreb.) (TP) and cocksfool (Dactylis glomerata L.) (Cfl) hay fields, overseeded with red clover (Trifolium pratense L.). Annual herbage dry mailer production from the plots …

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Co-Operative Evaluation Of Northern Hemisphere Grassland Germplasm In Inner Mongolia And The Western United States, Larry K. Holzworth, Gu Anlin, J Scheetz, J Carlson Aug 2024

Co-Operative Evaluation Of Northern Hemisphere Grassland Germplasm In Inner Mongolia And The Western United States, Larry K. Holzworth, Gu Anlin, J Scheetz, J Carlson

IGC Proceedings (1993-2023)

Inner Mongolia, Peoples Republic of China (PRC) and the western United States (USA) have deteriorated or altered grasslands needing revegetation and stabilisation for soil protection and sustained production. The semi-arid and arid grasslands of Inner Mongolia and the western USA are ecologically similar in structure and function. Bach can contribute elite germplasm for revegetation programs on both continents. Evaluation trials were established jointly in Inner Mongolia and in the northern intermountain west USA by Chinese and American scientists during 1991 and 1993. Entries included Asian and North American plant materials. Results of these co­operative trials show many species having high …

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Factors Affecting Winter Survival Of Dactylis Glomerata In Alberta, Canada, Jane R. King, G A. Van Esbroeck Aug 2024

Factors Affecting Winter Survival Of Dactylis Glomerata In Alberta, Canada, Jane R. King, G A. Van Esbroeck

IGC Proceedings (1993-2023)

Dactylis glomerata (orchardgrass) is not completely winter hardy under the extreme continental climate of the Canadian prairies. It grows vigorously in the autumn, but cutting or grazing at this time may affect its winter survival. Miniature snow fences (30 cm) were used to examine the interaction between autumn harvest date and stubble height effects on winter survival and subsequent yields. Plants cut in September and October had lower autumn carbohydrate storage levels and, in the absence of a snow fence, suffered more winter kill and had lower spring yields than plants cut in August. The presence of a snow fence …

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Selection For Improved Low Temperature Germination Of White Clover Seed, J R. Caradus Aug 2024

Selection For Improved Low Temperature Germination Of White Clover Seed, J R. Caradus

IGC Proceedings (1993-2023)

Selections were made within 10 cultivars of white clover (Trifolium repens L.) for rapid germination rale al 4°C. There were 2 selection cycles and progeny from crosses between genotypes selected from within cultivars were compared wilh the original unselected cultivar seed lines for ability to germinate at 4°C. There ·was significant variation among control cultivars and among selected lines for germination rate index at 4°C. Cultivars from northern Europe had a higher germination rate index than cultivars from New Zealand, Australia and Israel. Selection for increased germination rate index at 4°C was successful and the relationship between germination rate …

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Effects Of Grassland Burning During Early Spring In Korea, Sung Seo Aug 2024

Effects Of Grassland Burning During Early Spring In Korea, Sung Seo

IGC Proceedings (1993-2023)

A field experiment was carried out in 1989 and 1990 to determine the effects of dead material (length 15 cm and 30 cm), date of burning (21 February, 2 March, I I March and 20 March) and a non-burning control treatment during eacly spring on grass growth, yield, and nutritive value in existing pasture dominated by orchardgrass (Dactylis glomerata L.). On average burning treatments increased the soil surface temperature and the 10 cm soil depth temperature by S.5°C and 2.8°C respectively. A little burning damage was present after the burn on 20 March. However, burning, date of burning or …

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Factors Required To Sustain Pastoral Farming Systems And Forage Supply In Winter Cold Zones, H T. Kunelius, D A. Kim, H Hirota, T Zhu Aug 2024

Factors Required To Sustain Pastoral Farming Systems And Forage Supply In Winter Cold Zones, H T. Kunelius, D A. Kim, H Hirota, T Zhu

IGC Proceedings (1993-2023)

Forage grasses and legumes are a main component of livestock diets in winter cold zones, There are over 130 million ha of grassland in this zone and there is a large, undeveloped land base in fringe areas suitable for forage production. Regulations on land ownership and use hamper efficient development of forage-based farming systems in some regions. The short growing season Ii mils the grassland farming in the winter cold zones. The winter season is long and cold temperatures, freezing and thawing, and diseases' exert severe stress on overwintering forage plants. The development of persistent cultivars is essential for sustained …

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Rangeland Exploitation- The Global Need For Integrated Science, A H. Nordmeyer Aug 2024

Rangeland Exploitation- The Global Need For Integrated Science, A H. Nordmeyer

IGC Proceedings (1993-2023)

The global surge in human population growth is placing major pressures on winter cold rangelands. The need is urgent to develop an international science that comes to grips with local requirements for food and fuel, and combines these with the global requirements of maintaining and increasing stores of carbon. The critical problem for rangelands is that most systems do not generate incomes to allow replacement or enhancement of the nutrients removed by herded animals, by cut-and-carry forage harvesting, and by fuel extraction. Progress in rangeland science that is relevant to subsistence cultures requires a better understanding of the carbon and …

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Sustainable Clover-Dominant Swards For Lamb Production Under Low Temperatures, J E. Vipond, G Swift, T H. Mcclelland Aug 2024

Sustainable Clover-Dominant Swards For Lamb Production Under Low Temperatures, J E. Vipond, G Swift, T H. Mcclelland

IGC Proceedings (1993-2023)

ABSTRACT Upland pastures for sheep and beef cattle in the UK typically contain less than 5% clover in the grazed herbage, Use of fertiliser N, low P and K status, low pH and inappropriate choice of grass and clover varieties are implicated in this low pasture clover content, along with temperature constraints. In a 4-year study, swards of tecraploid perenn ial ryegrass (Lolium perenne, cv. Condesa) were compared with swards of a diploid perennial rye grass (cv. Contender) both being maintained at a constant grazing height of 4-6 cm and given 160 kg N/ha/year. Lamb output (kg/ ha) from …

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Effect Of Condensed-Tannins In Lotus Pedunculatus On The Digestion And Plasma Metabolism Of Methionine And Cystine In Sheep, W C. Mcnabb, G C. Waghorn, T N. Barry, I D. Shelton Aug 2024

Effect Of Condensed-Tannins In Lotus Pedunculatus On The Digestion And Plasma Metabolism Of Methionine And Cystine In Sheep, W C. Mcnabb, G C. Waghorn, T N. Barry, I D. Shelton

IGC Proceedings (1993-2023)

The effect of condensed tannins (CT) on the digestion and metabolism of methionine and cystine was studied in sheep housed indoors and fed Lotus pedunculatus hourly. The PBO sheep (no CT) lost 30% of ingested methionine and cystine across the rumen, whereas the control sheep (CT acting normally) lost no methionine and cystine across the rumen. The apparent absorption of methionine from the small intestine was 27% higher in control than PBO sheep, but both groups had a similar apparent absorption of cystine from the small intestine. CT had no effect upon plasma methionine irreversible loss rate (IRL), but markedly …

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Stockpiling Of Tropical Forage For The Dry Season In Martinique, I Gayalin Aug 2024

Stockpiling Of Tropical Forage For The Dry Season In Martinique, I Gayalin

IGC Proceedings (1993-2023)

In Martinique standing fodder crops were found to be an alternative way to improve dry season feeding to livestock. The stockpiling ability of 4 grasses (Tripsacum laxum, Pennisetum purpureum, • Brachiaria decumbens and Panicum maximum) has been tested for 2 years on 3 sites located in different pedoclimatic zones. Two deferment 1 dates were chosen (1 and: 2 months before the end of the rainy season). During the dry season, from February-June, dry matter (DM). yields and morphological composition (green leaves, stems and dead' materials) were estimated through sampling every fortnight. In the· drier site, accumulated DM yields and …

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Breeding Of Apomictic Brachiaria Through Interspecific Hybridisation, C B. Do Valle, C Gilenke, G.O C. Leguizamon Aug 2024

Breeding Of Apomictic Brachiaria Through Interspecific Hybridisation, C B. Do Valle, C Gilenke, G.O C. Leguizamon

IGC Proceedings (1993-2023)

Brachiaria is a tropical grass genus recently introduced on the American continent. Two species are widely sown as pastures in Brazil, n. decumbens (D) cv. Basilisk, and n. brizantha (B) cv. Marandu. These 2 cultivars behave as obligate apomicts (APO), therefore impairing direct hybridisation. A breeding programme was started al the National Center for Research in Beef Callie (CNPGC­EMBRAPA), Campo Grande, MS, Brazil in 1988, with the objeclive of obtaining apomictic hybrids with the growth habit and adaptation lo poor soils of D, resistance lo spilllebugs (Homoplera:Cercopidae) of B using sexual B. mzil:iensis (R) as mother plant. R has …

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