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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 20 of 31 for “"beef cow"”.
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Effects of Monensin and Synchronized Breeding on Beef Cow Production
Made available in DSpace on 2014-12-13T19:42:50Z (GMT). No. of bitstreams: 1 8004297.pdf: 4728381 bytes, checksum: ce4d3a736e7561315a29ab2a246b6534 (MD5) Previous issue date: 1979
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Effects of Supplemental Fat on Beef Cow and Heifer Performance, Lactation and Reproduction
… to evaluate the effects of supplemental fat on beef cow and heifer performance, lactation and reproduction. Supplemental fat sources, differing in fatty acid composition, were evaluated to determine the effects on performance, lactation and reproduction in Angus x Simmental cows (Exp. 1) or …
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Effects of supplementing methionine hydroxy analog on beef cow performance, milk production, and reproduction
Mature Simmental × Angus cows (214 cows; 635 ± 7.4 kg) were utilized to determine the effects of late gestation and early postpartum supplementation of methionine hydroxy analog (MFP; Novus International, Inc., St. Charles, MO, USA) on cow BW, BCS, milk production, milk composition, reproduction, …
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Economic analyses of the effects of calving season on beef cow-calf-forage systems
Important implications of the study are: beef cow-calf production is competitive over a wide range of beef prices and it may increase farm returns to feed small amounts of corn silage rather than grow additional pasture even when the weaned steer calf-corn ratio is quite low.
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The effects of winter feeding systems on beef cow performance, soil nutrients, crop yield and system economics
… intensive winter feeding system (drylot (DL)) on cow performance, soil nutrients, crop yield and system cost of production. Differences in BW (P
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An Economic Analysis of the Organization and Operation of a Sample of Southern Illinois Farms Which Maintain Beef Cow Herds
Made available in DSpace on 2014-12-04T21:48:00Z (GMT). No. of bitstreams: 1 0018213.pdf: 13315369 bytes, checksum: 1416261e99d0349081b0146ec429b25b (MD5) Previous issue date: 1956
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Prevalence of antibodies to Bovine Leukemia virus, Neospora caninum and risk factors, and biosecurity practices in beef cow-calf herds in Canada.
A total of 4,778 cows from 179 herds were tested for antibodies to N. caninum using a commercially available ELISA. Neospora caninum herd-level seroprevalence ranged from 25.0% to 75.9% (a herd was considered positive with ≥ 2 cows testing positive). The true cow prevalence was estimated as 5.2% …
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Effects of prepartum plane of nutrition during mid- or late gestation on beef cow BW, BCS, blood hormone concentrations, and preimplantation embryo
… of nutrition during mid- or late gestation on cow BW, BCS, blood hormone concentrations, and preimplantation embryos. In Exp. 1, multiparous Angus and Angus x Simmental cows (n = 33; BW = 664 ± 78 kg) were fed diets formulated to provide 3 planes of nutrition: 100% NRC energy and protein …
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Effects of housing beef cow-calf pairs on dry lot vs pasture on cow performance as well calf performance and behavior through feedlot receiving
… were to analyze the effects of housing cow-calf pairs in dry lots (DL) or pasture (PAST) on cow performance and reproduction and calf performance and behavior through the receiving phase. Simmental × Angus (n = 108; 87 ± 11.5 d postpartum) spring-calving cows were stratified by age, BW, …
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Evaluation of Swath Grazing Simple and Complex Polycrop Mixtures on Forage Biomass and Quality, Beef Cow Performance and Enteric Methane Emissions, System Economics and Soil Health Characteristics
… are of increasing interest to western Canadian beef producers as alternative forages for grazing as they may promote soil health, plant biodiversity and nutritive value. A 2-yr grazing study (2022 and 2023 for yr 1 and 2, respectively) was managed at the Livestock and Forage Center of Excellence …
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Profitability Analysis of Forage Based Beef Systems in Appalachia
… Virginia is livestock production, particularly beef cow calf operations. However; topography and land holding patterns have resulted in a majority of small farms operating part time on less than 150 acres. These farms, while abundant, are not necessarily profitable. Management intensive grazing …
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Factors That Enhance Pituitary and Ovarian Functions in Postpartum Beef Cows (Naloxane, Gn-Rh, Pgf(2), Indomethacin)
… years ahead of it becomes ideal that each beef cow should produce one calf every year in order to sustain an economically viable cow-calf operation. In actual farm settings, however, this ideal condition is seldom achieved because of a variety of factors that act singly or in combination …
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Effect of sward height and concentrate supplementation on forage dry matter intake, digestibility and grazing time of spring-calving beef cows
… of grazing cattle, twenty-four cross bred Angus beef cow-calves were randomly assigned to two SH treatments (4--8 or 8--11 cm) with three supplement levels: 6.24, 3.12 or 0 kg/d. The study was conducted in three periods (P): May (P1), June/July (P2) and August (P3) in 1996. There was no SH x …
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A polyperiod production-investment model of growth of large-size livestock farms in Southwest Virginia
… had a greater potential for expansion than the beef cow enterprise. A major proportion of investments were financed with capital generated within the firm. The greatest amount of investments were done during the last production period. This stresses the importance of time in the capital …
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Strategies to improve fertility of Bos taurus beef females enrolled in estrous synchronization protocols
… (ES) protocols enhances profitability of beef cow-calf operations by improving percentage of cows pregnant early in the breeding season and increasing kg of calf weaned per cow exposed. Many factors, however, influence the fertility of cattle enrolled to ES protocols. The overall goal of …
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Strategies for Improving Reproductive Efficiency of Beef Cattle with Assisted Reproductive Technologies
Reproductive efficiency in beef cattle can be improved with reproductive technologies at the herd, individual cow, and embryonic levels. Decreasing the bull:cow ratio for natural service after fixed time artificial insemination (FTAI) can alleviate economic burden associated with FTAI. In …
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Effects of fescue cultivar on performance of beef cows grazed on summer stockpiled tall fescue pastures
… 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 date and then …
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Nutrient Restriction Effects on Ovulatory Follicle and Corpus Luteum Development and Progesterone Production of Bos taurus Cows
… strongly impacts efficiency and profitability of beef cow-calf operations. The objective of this study was to determine if nutrient restriction impacts ovulatory follicle size and corpus luteum (CL) development and function of Bos taurus cows enrolled in estrous synchronization. A total of 26 …
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Changes in vaginal microbiome of beef cows enrolled in estrous synchronization protocols and its relation to fertility
… (ES) is a valuable technology that can help beef cow-calf producers to overcome infertility caused by prolonged anestrus. Protocols for ES that use progesterone (P4) supplementation are of particular value to cows with prolonged postpartum anestrus as P4 triggers them to begin cycling and …
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Estimating Bacterial Loadings to Surface Waters from Agricultural Watersheds
… soils to which dairy manure was applied, and 3) beef and dairy fecal deposits. The dairy manure storage ponds were sampled just under the pond surface. The FC and EC diminution (settling plus die-off) rates for dairy manure storage ponds were 0.00478 day⁻¹ and 0.00781 day⁻¹, respectively. The …
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