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 10 of 10 for “"lactating cow"”.
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Holstein heifer behaviors and lactating cow nutritional management for improved reproductive performance on dairy farms
As the industry pushes for more productive cows, the reproductive performance on farms declines. Poor reproductive management on farms can be costly due to decreased milk production in late lactation, higher feed costs from a longer calving interval, and more labor and supplies from multiple …
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Investigation of the presence and activity of the innate immune component, Complement, in bovine milk
… appearing to be more active in milk samples from cows with a higher somatic cell counts (SCC). Inducing sub-clinical mastitis in the healthy quarter of a lactating cow confirmed that increased Complement activity effect was local to the affected quarter and not manifested systemically. Complement …
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Impact of Precision Feeding Strategies on Whole Farm Nutrient Balance and Feeding Management
… of Virginia. Herd sizes averaged 271 and 390 lactating cows for treatment and control farms while milk yield averaged 30 and 27 kg/d per lactating cow, respectively. Crop hectares grown averaged 309 and 310 ha for treatment and control farms, respectively. Treatment farms purchased and …
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Metabolic and endocrine adaptations to heat stress in lactating dairy cows
… intake. Previous studies comparing heat-stressed lactating cows with control group pair-fed (PF) to the intake of HS group but housed in thermoneutral conditions, in order to eliminate the confounding factors result from differentiated feed intakes, showed that HS increased circulating insulin and …
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The Impact of Parlor Equipment and Milking Procedures on Milk Quality in the Southeast US
… associated with lower BTSCS. Farms that housed cows exclusively on pasture had greater BTSCS than farms that keep lactating cows in confinement with no pasture access. Utilization of a freestall for lactating cow housing was associated with lower BTSCS. The likelihood of future dairy operation …
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Improving nitrogen efficiency and profitability of dairy cattle in the United States
… nutritionists' approaches toward balancing CP in lactating cow diets, and to leverage existing knowledge of postabsorptive AA metabolism through the application of a mathematical ration-balancing model to predict N efficiency through a more accurate postabsorptive amino acid (AA) delivery. In …
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Nutrition and management considerations for bulls and breeding females
… portion of the reproductive failures in cow-calf enterprises is due to the fertility of the herd bull. Thus, the objective of this dissertation was to evaluate nutritional and management strategies to optimize the development of bulls and breeding females. Research has been inconsistent …
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The effects of dietary forage, social hierarchy, and stocking density on stress in lactating cows during relocation
… hierarchy, and stocking density on stress in lactating cows during relocation to new dairy facilities. In experiment one, 23 lactating cows were fed a basal ration, or the basal ration plus grass or alfalfa hay at 10% of DM offered from 3 wk pre-move to 9 wk post-move. In experiment two, 17 …
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Some Observations Pertaining to the Effects of Relaxin Upon the Bovine
… material and bacteria. In the non-pregnant cow the opening is small. The cervix opening is constricted enough so that difficulty in inserting an artificial insemination tube sometimes occurs. If ova transfer can be perfected to the degree that artificial insemination is today, a …
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Manure and Nutrient Accretion, Partitioning, and Excretion in Holstein Heifers
… heifers were excreting as much urinary P as a lactating cow. Calves were purchased from a commercial dairy at 3 d old (± 1d) and transported to the VT Dairy Center. They remained on study until 63 d when they were harvested for body composition. Four treatment diets were fed; a control milk …