Journal Article10.1111/rda.14157
Progesterone supplementation to improve fertility of selected subgroups of lactating cows during the summer and fall.
TL;DR: In this paper , the insertion of a controlled intravaginal drug-releasing (CIDR) device containing progesterone after artificial insemination (AI) increases pregnancy per AI (P/AI) in cows with uterine disease and low body condition score after calving.
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Abstract: One major cause of low fertility of cows in the summer is progesterone deficiency. We found that insertion of a controlled intravaginal drug-releasing (CIDR) device containing progesterone after artificial insemination (AI) increases pregnancy per AI (P/AI) in cows with uterine disease and low body condition score after calving. Here we treated only these two subgroups, during the summer and autumn. Control (n = 191 AI) and treatment (n = 230 AI) cows were inseminated at estrus and the treated group received a CIDR device on day 5 post-AI, for 14 days. Overall analysis of data during the summer and autumn indicated no significant differences between treatment and control groups. Analysis of the summer data only indicated a significant effect of treatment: P/AI was higher in CIDR-treated vs. control groups (34.2 vs. 19.3%; P < 0.038). Results indicated a 15% increase in P/AI during the summer for CIDR-treated cows in subgroups that had responded positively to the progesterone treatment.
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References
Invited review: Body condition score and its association with dairy cow productivity, health, and welfare
TL;DR: There is relative consistency in the associations among calving and nadir BCS, and BCS change on milk production, postpartum anestrous, the likelihood of a successful pregnancy and days open, therisk of uterine infection, and the risk of metabolic disorders.
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Large Dairy Herd Management
C.J. Wilcox,H. H. van Horn,B. Harris,H.H. Head,S.P. Marshall,William W. Thatcher,D.W. Webb,J.M. Wing +7 more
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TL;DR: This website will be so easy for you to access the internet service, so you can really keep in mind that the book is the best book for you.
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Impact of heat stress on cow reproduction and fertility.
David Wolfenson,Zvi Roth +1 more
TL;DR: Even a small rise in air temperature, on the order of 1–2 °C, due, for instance, to global warming, may induce severe hyperthermia in dairy cows, as demonstrated in Figure 1.
Association between body condition score change during the dry period and postpartum health and performance
TL;DR: Cows that gained BCS during the dry period had greater yield of milk, fat, and protein and had reduced somatic cell linear score in the subsequent lactation.
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Progesterone supplementation postinsemination improves fertility of cooled dairy cows during the summer
TL;DR: Exogenous progesterone supplementation on d 5 post-AI for 13 d improves summer fertility of subpopulations of cows exhibiting low BCS and postpartum reproductive disorders and Reproductive management based on specific hormonal treatment of designated subgroups of cows known to derive beneficial effects from it might improve treatment efficiency and reduce expenses.
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