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 5 of 5 for “"Replacement heifer"”.
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Evaluating long term benefits of genomic selection programs in beef cattle breeding programs in Western Canada
… number of calves sired, calf performance, and replacement heifer performance over multiple years. To evaluate sire performance and account for the different numbers of cows and sires in each breeding group, bull prolificacy indexes (BPI) were calculated. BPI ranged from 0-4 and sires were …
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Comparison of relative net income with and without the application of opportunity cost
… forfeited that could have been generated by a replacement heifer, were calculated for 48 month, 60 month, 72 month, and all lactations herdlife period. Application of opportunity cost caused a decreased value for length of herdlife. Number of lactations initiated prior to the various herdlife …
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Influence of prepartum diet type on cow performance and subsequent calf performance
… d56 and d112. On d112, steers (n = 64) and non-replacement heifer calves (n = 23) were weaned and placed on a common feedlot diet with individual feed intake monitored using GrowSafe. Feedlot calves were harvested at a commercial facility when ultrasound 12th rib fat thickness (BF) reached 1.2 …
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Molecular phenotypes associated with heifer fertility
… practices put a heavy burden on producers. Replacement heifer development is the third largest cost incurred by producers, behind feed and labor. Consequently, the failure of a heifer to conceive in her first breeding season translates directly into financial loss for the producer and …
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METHANE MITIGATION, FEED EFFICIENCY, AND HEAT STRESSIN REPLACEMENT HEIFERS: NUTRITIONAL ANDMANAGEMENT APPROACHES FOR SUSTAINABLE DAIRYPRODUCTION
… effects of heat stress in Italian Holstein dairy heifers. The first study (Chapter 3) describes an in vivo trial evaluating the inclusion of increasing doses of lysozyme in the diet of dairy heifers to assess the effects of this antimicrobial enzyme on enteric methane production. The results …