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To assess the impact of a second PGF2α injection in the Ovsynch protocol on pregnancy rates in Simmental cows.

July 30, 2026Van veterinary journalOpen Access

The Effect of Second Prostaglandin F2α Application with the Presynchronization Protocol on Fertility in Simmental Cows

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To assess the impact of a second PGF2α injection in the Ovsynch protocol on pregnancy rates in Simmental cows.
Conducted on a commercial farm with 103 lactating Simmental cows.
Cows divided into two groups: PG-3-G (n=56) and PG-3-PG (n=47) with additional PGF2α administration.
Compared pregnancy rates, follicle size, parity, and milk yield between groups.
Pregnancy/artificial insemination rates were 51.78% in PG-3-G and 51.06% in PG-3-PG, p=0.942.
Mean preovulatory follicle diameter was 1.71 cm (PG-3-G) vs 1.79 cm (PG-3-PG), p=0.047.
Multiparous cows showed higher but not statistically significant pregnancy rates compared to primiparous cows.

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Randomized trial evaluates the effect of additional PGF2α on infertility rates in Simmental cows, suggesting potential benefits for multiparous cows.

Kara et al. (2026) studied this question.

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Randomized trial evaluates the effect of additional PGF2α on infertility rates in Simmental cows, suggesting potential benefits for multiparous cows.