Fertility in dairy cows following presynchronization and administering twice the luteolytic dose of prostaglandin F2α as one or two injections in the 5-day timed artificial insemination protocol

Theriogenology
E S RibeiroJ E P Santos

Abstract

The objectives were to evaluate pregnancy per AI (P/AI) of dairy cows subjected to the 5-day timed AI protocol under various synchronization and luteolytic treatments. Cows were either presynchronized or received supplemental progesterone during the synchronization protocol, and received a double luteolytic dose of PGF2α, either as one or two injections. In Experiment 1, dairy cows (n=737; Holstein=250, Jersey=80, and crossbred=407) in two seasonal grazing dairy farms were randomly assigned to one of four treatments in a 2×2 factorial arrangement. The day of AI was considered study Day 0. Half of the cows were presynchronized (G6G: PGF2α on Day -16 and GnRH on Day -14) and received the 5-day timed AI protocol using 1 mg of cloprostenol, either as a single injection (G6G-S: GnRH on Day -8, PGF2α on Day -3, and GnRH+AI on Day 0) or divided into two injections of 0.5 mg each (G6G-T: GnRH on Day -8, PGF2α on Day -3 and -2, and GnRH+AI on Day 0). The remaining cows were not presynchronized and received a controlled internal drug-release (CIDR) insert containing progesterone from GnRH to the first PGF2α injection of the 5-day timed AI protocol, and 1 mg of cloprostenol either as a single injection on Day -3 (CIDR-S) or divided into t...Continue Reading

References

Jan 1, 1996·Journal of Reproduction and Fertility·I Revah, W R Butler
May 7, 2004·Reproduction : the Official Journal of the Society for the Study of Fertility·Emma C L BleachPhilip G Knight
Feb 11, 2009·Reproduction : the Official Journal of the Society for the Study of Fertility·Ronaldo L A CerriJosé E P Santos
Mar 17, 2010·Journal of Cellular Physiology·Anima TripathiShail K Chaube

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Citations

Apr 8, 2014·Animal : an International Journal of Animal Bioscience·M C WiltbankM G Diskin
Apr 9, 2014·Animal : an International Journal of Animal Bioscience·R S BisinottoJ E P Santos
Nov 28, 2013·Theriogenology·Milo C Wiltbank, J Richard Pursley
Apr 5, 2016·The Veterinary Clinics of North America. Food Animal Practice·Jeffrey S Stevenson
Jan 13, 2015·Animal Reproduction Science·Eduardo TrevisolJoão Carlos Pinheiro Ferreira
Sep 1, 2014·Journal of Dairy Science·E S RibeiroJ E P Santos
May 22, 2020·The Journal of Veterinary Medical Science·Rumika YoshidaTakeshi Osawa
May 30, 2020·Animals : an Open Access Journal From MDPI·Aitor Fernandez-NovoSusana Astiz

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