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Full-Text Articles in Dairy Science
Effects Of Bedding With Recycled Sand On Lying Behaviors, Udder Hygiene, And Preferences Of Lactating Holstein Dairy Cows, Heather Deanna Ingle
Effects Of Bedding With Recycled Sand On Lying Behaviors, Udder Hygiene, And Preferences Of Lactating Holstein Dairy Cows, Heather Deanna Ingle
Masters Theses
Effects of bedding with recycled sand and season on lying behaviors, stress, hygiene, and preferences of late-lactation Holstein cows were studied. Cows (n=64) were divided into 4 groups (n=8 per group) per season. In summer (Aug-Sept), cows were balanced by days in milk (268.1±11.9 d) and parity (2.0±0.2). In winter (Jan-Feb), mean DIM was 265.5±34.1 d. Cows were assigned to one of two treatments (trt) using a crossover design with each trt lasting 7-d (no-choice phase): bedding with recycled sand (RS; n=32) or control (CO; clean sand; n=32). Stocking density was maintained at 100%. Choice phase allowed a cow to …
Efficacy Of Extending The Voluntary Waiting Period In Lactating Dairy Cows To Improve Fertility Of Sex-Sorted Semen, Sarah E. Orr
Efficacy Of Extending The Voluntary Waiting Period In Lactating Dairy Cows To Improve Fertility Of Sex-Sorted Semen, Sarah E. Orr
Masters Theses
The objective of this study was to compare fertility of sex-sorted semen in lactating cows using a voluntary waiting period (VWP) of approximately 55 days (VWP55) or 85 days (VWP85). At 21 days in milk (DIM), cows were randomly assigned to begin estrus synchronization at 55 or 85 DIM. Only cows confirmed cyclic by 55 DIM were synchronized. At 55 or 85 DIM, cows [VWP55 (n=44); VWP85 (n=45)] having a corpus luteum (CL) were administered PGF2α [two alpha]. Estrus was monitored continuously by the HeatWatch® [registered sign] system ( …