Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
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Showing 1 to 9 of 9 for “"fall-calving"”.
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Linear programming applied to a forage based cattle and sheep production system on a demonstration farm
… requirements during February and March. A fall calving cow-calf herd, with calves being marketed, at 634 pounds on September 30 was more profitable than marketing during July at lighter weights even though this system had higher forage requirements. Neither a spring calving cow herd or the …
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Impact of grazing stockpiled tall fescue of lactating beef cows
Two experiments are described, in which fall-calving cow-calf pairs grazed stockpiled tall fescue at three different endophyte infection levels (20, 51, and 89%) and four forage allowances (2.25, 3.00, 3.75, and 4.50% of BW). A hay feeding treatment was included as a standard for comparison. Each …
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Effects of supplementing methionine hydroxy analog on beef cow performance, milk production, and reproduction
… and calf performance until weaning in a fall-calving, coolseason grazing system. Cows were confirmed pregnant prior to experiment, stratified by BW, cow age and AI sire, and assigned to one of twelve pastures (17 or 18 cows·pasture-1). Pastures were randomly allotted to one of two …
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Effects of fescue cultivar on performance of beef cows grazed on summer stockpiled tall fescue pastures
… stockpiled (SS) pastures and the performance of fall-calving beef cow/calf pairs stocked on each cultivar. Fescue cultivars used were KY-31 and MaxQ for E+ and NE treatments, respectively. Pregnant Simmental x Angus cows (128 total, 64 each yr) were stratified by BW, BCS, and expected calving …
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The Virginia Beef Cattle Simulation Model: A bio-economic simulation program modeling the interactions among reproduction, forage availability, nutrition, growth, and marketing in beef cattle
… tested using a mathematical model with two calving seasons, three lengths of breeding season, four culling policies, and a year effect. Descriptive statistics suggest that the program code works in a consistent manner. However, several potential programming inconsistencies were discovered. …
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Influence of prepartum nutrition on cow performance and subsequent calf performance, glucose tolerance, carcass characteristics, efficiency, and gene expression
… cow nutrition within beef production systems. Fall-calving cows grazing endophyte-fescue experience a decline in forage quality during late gestation, when fetal growth occurs at a high rate. Fall-calving, mature cows and their progeny were used to evaluate the effects of late gestation dried …
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Effects of feeding supplemental fat to cows in late gestation on cold tolerance in newborn calves
… during short-term cold stress were examined in fall-born neonatal beef calves. Pregnant fall-calving heifers (n = 15) were randomly assigned to three dietary treatments: Control (CON, n=5), Safflower seed (SAF, n=5), or Cottonseed (COT, n=5) supplement. Hay-based isonitrogenous and isocaloric …
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Nutrition and management considerations for bulls and breeding females
… performance, and subsequent calf growth of fall-calving beef heifers. Angus × Simmental heifers [n = 399; 240 ± 20.0 kg initial BW; age = 252 ± 20 d] were stratified by BW and BCS and assigned to 1 of 12 groups in each of the two production years. Pens were randomly assigned to 4 treatments: …
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Effects of maternal supplementation of trace minerals and fatty acids on beef progeny
… to a greater extent from mid-supplementation to calving for PUFA compared with CON cows. Cow plasma C20:0, C20:5n-3, and C22:6n-3 were increased (P ≤ 0.01) in PUFA during supplementation period. At birth, PUFA steers had greater (P = 0.01) plasma C20:5n-3. No differences (P ≥ 0.33) were detected …