Effect of insemination after estrous detection on pregnancy per artificial insemination and pregnancy loss in a Presynch-Ovsynch protocol: A meta-analysis

Journal of Dairy Science
S BorchardtW Heuwieser

Abstract

Presynchronization of cows with 2 injections of prostaglandin administered 14d apart (Presynch-Ovsynch) is a widely adopted procedure to increase pregnancy per artificial insemination (P/AI) for the first service. In a Presynch-Ovsynch protocol, 2 different management strategies can be observed. Either all cows receive timed artificial insemination (onlyTAI) or cows detected in estrus after the second PGF2α injection are inseminated and the remaining cows without signs of estrus will be subject to timed AI (EDAI+TAI). A systematic review of the literature was performed with the objective to evaluate the effect of insemination after estrous detection during a Presynch-Ovsynch protocol for the first service on fertility in lactating dairy cows. Two statistical approaches were conducted using either a fixed or a random effects meta-analysis based on the heterogeneity among the experimental groups. Reproductive outcomes of interest were P/AI measured on d32 (d 28 to 42) and pregnancy loss between d32 and 60 (d 42 to 74) of gestation. In approach 1, 3 randomized controlled studies including 1,689 cows with the primary objective to evaluate the effect of insemination after estrous detection in a Presynch-Ovsynch protocol were used. T...Continue Reading

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Nov 28, 2013·Theriogenology·Milo C Wiltbank, J Richard Pursley

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Citations

Nov 21, 2017·Journal of Dairy Science·J S Stevenson, J H Britt
May 30, 2020·Animals : an Open Access Journal From MDPI·Aitor Fernandez-NovoSusana Astiz
Jan 29, 2021·Animals : an Open Access Journal From MDPI·Carlos Eduardo Cardoso ConsentiniRoberto Sartori

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