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- W3011201029 abstract "Objective To compare fixed‐time artificial insemination (FTAI) conception rates and serum progesterone concentrations at the time of FTAI for cows treated with the original Ovsynch program (OV) with those treated with a modified Ovsynch (MO) program. Design This was a randomised clinical trial. Methods The study used five split‐calving, pasture‐based dairy herds in Southwest Victoria, Australia. Controls (n = 851) received the OV program: day 0 gonadotropin‐releasing hormone, day 7 prostaglandin F 2α (PGF), day 9 gonadotropin‐releasing hormone and FTAI at day 10. The treatment group (n = 852) received a MO program with an additional prostaglandin injection on day 8. Subsets of cows from each group were sampled for blood progesterone at the time of FTAI. Results The treatment group demonstrated FTAI conception rates that were 7% (95% confidence interval 2%–12%) greater than the control group. After adjusting for the effect of age, days in milk at Mating Start Date and herd, the odds of conception using FTAI was 1.36 (95% confidence interval 1.12–1.66) times greater for treatment group cows compared with control group cows. The variability of serum progesterone concentrations at the time of FTAI was significantly less for treatment group cows compared with control group cows. Conclusion For Holstein‐Friesian and Holstein‐Friesian cross‐bred cows managed in pasture‐based dairy herds in southern Australia, a MO protocol, including a second injection of prostaglandin F 2α on day 8, increased FTAI conception rates compared with cows receiving the OV protocol." @default.
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- W3011201029 date "2020-03-18" @default.
- W3011201029 modified "2023-10-11" @default.
- W3011201029 title "Effect of a second treatment of prostaglandin F<sub>2α</sub> during the Ovsynch program on fixed‐time artificial insemination conception rates and luteolysis in split‐calving, pasture‐fed dairy cows" @default.
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- W3011201029 doi "https://doi.org/10.1111/avj.12918" @default.
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