Open Access. Powered by Scholars. Published by Universities.®
Articles 1 - 3 of 3
Full-Text Articles in Life Sciences
Transition Cow Metabolites And Physical Traits Influence Days To First Postpartum Ovulation In Dairy Cows, S. Banuelos, J. S. Stevenson
Transition Cow Metabolites And Physical Traits Influence Days To First Postpartum Ovulation In Dairy Cows, S. Banuelos, J. S. Stevenson
Kansas Agricultural Experiment Station Research Reports
The objective of this study was to assess key metabolites and patterns of prepartum and postpartum physical activity as they relate to the onset of first postpartum ovulation in lactating dairy cows. Close-up dry Holstein cows (n = 82) and late gestation heifers (n = 78) were enrolled beginning 3 weeks before expected calving date (day 0). Cows were fit with Cow SensOor ear tags to assess transitional changes in eating, resting, rumination, activity, and ear-surface temperatures. Rectal temperatures were assessed and blood samples were collected on days 0, 3, 7, and 14 to measure concentrations of glucose, free fatty …
Daily Activity Measures And Milk Yield Immediately Before And After A Fertile Estrus, J. S. Stevenson
Daily Activity Measures And Milk Yield Immediately Before And After A Fertile Estrus, J. S. Stevenson
Kansas Agricultural Experiment Station Research Reports
The objective was to characterize changes in milk yield and other physical measures during a 7-day periestrual period encompassing estrus (day 0) and insemination. Lactating dairy cows milked thrice daily were fitted with CowManager SensOor ear tags capable of assessing real time eating, rumination, resting, high activity (estrus), ear-surface temperature, and providing heat alerts. Daily milk was unchanged during the periestrual period. Daily ear-surface temperature was greater during days 1 to 3 compared with day 0. Daily rumination and resting times reached nadirs on day 0, with decreases occurring 48 hours before estrus. Both rumination and resting times increased by …
Heat Stress During The Transition Period Is Associated With Impaired Production, Reproduction, And Survival In Dairy Cows, P. R. Menta, V. S. Machado, J. M. Piñeiro, W. W. Thatcher, J. E. P. Santos, A. Vieira-Neto
Heat Stress During The Transition Period Is Associated With Impaired Production, Reproduction, And Survival In Dairy Cows, P. R. Menta, V. S. Machado, J. M. Piñeiro, W. W. Thatcher, J. E. P. Santos, A. Vieira-Neto
Kansas Agricultural Experiment Station Research Reports
The objectives of this retrospective cohort study were to determine the association of heat stress exposure during the transition period with production, health, reproduction, and survival during the first 90 days postpartum in dairy cows. A total of 5,722 Holstein cows (2,324 heifers and 3,397 cows) were categorized into environmental condition (EC) groups based on average temperature humidity index (THI) exposure as thermoneutral (TN) or heat stress (HS) during the pre (Pre) and early postpartum (Post) periods into TN-TN, TN-HS, HS-TN, and HS-HS. In heifers, exposure to HS during the Pre, Post, or Pre and Post was associated with a …