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Showing 1 to 13 of 13 for “"Replacement heifers"”.
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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 …
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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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Growth, body composition and costs of feeding Holstein heifers
Growth and body composition of 121 Holstein heifers (4.6 to 18 mo and 129 to 407 kg) reared on pasture, drylot and pasture-drylot systems were evaluated in 6 experiments. Heifers were switched from drylot to pasture or the reverse to study carry-over effects from previous treatments; both systems …
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The Role of Nutrition and Administration of Estrogen in Holstein Calf Growth, Development, and Adenogenesis
Raising replacement heifers consumes a large portion of dairy and beef producers' income. An ultimate goal of producers is to decrease inputs and maximize outputs to produce fertile replacement heifers. Manipulating early postnatal growth and development through diet enables this practice to be …
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Influence of Prepubertal Dietary Protein and Age at First Calving on the Performance, Reproduction and Lactation of Replacement Beef Heifers
… the performance, reproduction and lactation of replacement beef heifers. Dietary protein levels ranging from 11.7% to 22.6% CP were tested in six experiments using several nutritional management systems. Heifers were managed to calve first at 18 or 24 months of age. The effects of prebreeding …
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Associations Among Beef Cattle Genotypes, Neospora Caninum Infection, and Reproductive Performance
… one of that study concluded that 6.9% of open, replacement heifers (n = 1306) tested seropositive. The second trial in that project found that 9.6% of the breeding age females (n = 500) tested were seropositive for Neospora caninum; and that state in which the cattle lived and age impacted (P < …
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Predicting topcrossing performance of inbred and selection lines of beef cattle
… put on postweaning performance tests, and the replacement heifers were fed growing rations. The topcross line means for postweaning weight of the males and females and the postweaning grade of the males were regressed on the means of the lines themselves. The line's own performance, adjusted …
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The use of carcass traits as indicators of heifer pregnancy in Angus cattle
… is heifer pregnancy, or the ability of heifers to conceive within the first breeding season. Heifers that fail to become pregnant in the first breeding season are often seen as an economic loss and culled from the herd. While these females may be fed out and marketed as feedlot cattle, …
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The effects of protein supplementation on performance of beef cattle grazing native mixedgrass range in western Kansas
… prepartum cow performance. The development of replacement heifers is a significant expense for cow-calf producers. Reducing the cost of heifer development programs while achieving high pregnancy rates is an industry-wide goal. Therefore, our objective in Study 2 was to determine if DDGS was a …
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Influence of dietary component manipulation and feed management strategies on growth and rumen development of weaned dairy heifers
<p>Well-developed replacement heifers provide a central foundation for the continued success of the dairy industry. Emphasis on improving pre-weaned calf nutrition has predominated in the industry, but opportunities exist to improve post-weaning heifer nutrition and management. We aimed to evaluate …
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Evaluation of Long-Acting Eprinomectin Compared to Conventional Anthelmintics in Cow/Calf Production
<p>Experiment 1, 83, newly weaned, fall-born crossbred heifer calves were allocated randomly to 1 of 3 anthelmintic treatments: 1) control (CON); 2) combination pour-on moxidectin and oxfendazole (MO); and 3) long-acting eprinomectin (LAE). Two preplanned orthogonal contrast statements were used: …
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Improving Nutrient Utilization and Growth in Dairy Heifers
… enterprise, one major cost is raising young heifers. Optimizing feeding programs of dairy heifers is imperative for the sustainability and profitability of dairy operations. Studies have shown that preweaned calves fed milk replacers (MR) with crude protein (CP) concentrations greater than …