Effect of reducing the period of follicle dominance in a timed artificial insemination protocol on reproduction of dairy cows

Journal of Dairy Science
J E P SantosR C Chebel

Abstract

Objectives were to determine the effect of reducing the period of follicle dominance in a timed artificial insemination (AI) protocol on pregnancy per AI (P/AI) in Holstein cows. In experiment 1, 165 cows received 2 injections of PGF(2alpha) at 36 and 50 d in milk (DIM). At 61 DIM, cows were assigned randomly to Cosynch 72 h (CoS72: d 61 GnRH, d 68 PGF(2alpha), d 71 GnRH) or to a 5-d Cosynch 72 h with 1 (5dCoS1: d 61 GnRH, d 66 PGF(2alpha), d 69 GnRH) or 2 injections of PGF(2alpha) (5dCoS2: d 61 GnRH, d 66 and 67 PGF(2alpha), d 69 GnRH). Blood was sampled at the first GnRH, first PGF(2alpha), and at the second GnRH of the protocols and assayed for progesterone. Ovulatory responses to GnRH were evaluated by ultrasonography. Cows were considered synchronized if they had concentrations of progesterone >or=1 ng/mL and <1 ng/mL on the days of the PGF(2alpha), and the second GnRH of the protocols, respectively, and if they ovulated within 48 h of the second GnRH injection. In experiment 2, 933 cows were assigned randomly to CoS72 or 5dCoS2. Blood was assayed for progesterone and ovaries were scanned as in experiment 1. Plasma on the days of the first PGF(2alpha) and final GnRH of the timed AI protocols was assayed for estradiol in 75...Continue Reading

References

Sep 1, 1994·Journal of Dairy Science·J D FergusonN Thomsen
May 15, 2002·Journal of Animal Science·D H TownsonJ L Pate
May 7, 2004·Reproduction : the Official Journal of the Society for the Study of Fertility·Emma C L BleachPhilip G Knight
May 13, 2005·Domestic Animal Endocrinology·A MiyamotoT J Acosta
Jan 16, 2009·Reproduction in Domestic Animals = Zuchthygiene·K N Galvão, J E P Santos
Feb 11, 2009·Reproduction : the Official Journal of the Society for the Study of Fertility·Ronaldo L A CerriJosé E P Santos

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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
Feb 8, 2016·Journal of Dairy Science·J S Stevenson, G C Lamb
Nov 28, 2013·Theriogenology·Milo C Wiltbank, J Richard Pursley
Aug 24, 2013·Reproduction in Domestic Animals = Zuchthygiene·D J SkarzynskiR Meidan
Sep 1, 2010·Reproduction in Domestic Animals = Zuchthygiene·W W ThatcherC R Staples
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
Apr 8, 2015·Reproduction in Domestic Animals = Zuchthygiene·M G Colazo, D J Ambrose
Oct 1, 2011·Theriogenology·M C WiltbankA Gumen
May 11, 2016·Theriogenology·J E P SantosE S Ribeiro

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