Resynchronization of ovulation and timed insemination in lactating dairy cows, II: Assigning protocols according to stages of the estrous cycle, or presence of ovarian cysts or anestrus

J. A. Bartolome; A. Sozzi; J. McHale; P. Melendez; A. C.M. Arteche; F. T. Silvestre; D. Kelbert; K. Swift; L. F. Archbald; W. W. Thatcher

doi:10.1016/j.theriogenology.2004.07.017

Resynchronization of ovulation and timed insemination in lactating dairy cows, II : Assigning protocols according to stages of the estrous cycle, or presence of ovarian cysts or anestrus

Research output: Journal Publications and Reviews › RGC 21 - Publication in refereed journal › peer-review

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Author(s)

J. A. Bartolome
A. Sozzi
J. McHale
A. C.M. Arteche
F. T. Silvestre
D. Kelbert
K. Swift
L. F. Archbald
W. W. Thatcher

Detail(s)

Original language	English
Pages (from-to)	1628-1642
Journal / Publication	Theriogenology
Volume	63
Issue number	6
Publication status	Published - 1 Apr 2005
Externally published	Yes

Link(s)

DOI	DOI https://doi.org/10.1016/j.theriogenology.2004.07.017 Final Published version
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Link to Scopus	https://www.scopus.com/record/display.uri?eid=2-s2.0-20044366166&origin=recordpage
Permanent Link	https://scholars.cityu.edu.hk/en/publications/publication(03c52ffe-ff8d-4bbc-a1b0-ff848175df5a).html

Abstract

Pregnancy rates were compared in lactating dairy cows (n = 1083) assigned to protocols for resynchronization of ovulation based on stages of the estrous cycle, or presence of ovarian cysts or anestrus. Cows were detected not pregnant by ultrasonography 30 d after a previous AI (study day 0) and classified as diestrus, metestrus, proestrus, with ovarian cysts or anestrus. Cows in diestrus (January-May) were assigned to either Ovsynch (GnRH day 0, PGF _2α day 7, GnRH day 9, and timed-AI [TAI] 16 h later; n = 96), or Quicksynch (PGF_2α day 0, estradiol cypionate [ECP] day 1, AI at detected estrus [AIDE] on day 2, or TAI on day 3; n = 96). Cows in diestrus (June-December) were assigned to either Ovsynch (n = 156) or Modified Quicksynch (PGF_2α day 0, ECP day 1, AIDE days 2 and 3, and to Ovsynch on day 4 if not detected in estrus; n = 142). Cows in metestrus were assigned either to Ovsynch (n = 68), Heatsynch (GnRH day 0, PGF_2α day 7, ECP day 8, AIDE day 9, or TAI day 10; n = 62), or GnRH + Ovsynch (GnRH on day 0, followed by Ovsynch on day 8; n = 64). Cows in proestrus, with ovarian cysts, or anestrus were assigned to either Ovsynch (proestrus n = 89, ovarian cysts n = 97, anestrus n = 8) or GnRH + Ovsynch (proestrus n = 87, ovarian cysts n = 109, anestrus n = 9). Pregnancy rate was evaluated 30, 55 and 90 d after resynchronized AI. For cows in diestrus (January-May), pregnancy rates were higher for Ovsynch (35.9, 29.2 and 26.0%) than for Quicksynch (21.7, 16.7 and 15.6%). For cows in diestrus (June-December), pregnancy rates were similar for Ovsynch (34.4, 24.0 and 23.6%) and Modified Quicksynch (27.1, 26.2 and 21.6%). For cows in metestrus, pregnancy rates were higher for GnRH + Ovsynch (33.3, 24.5 and 20.3%) than for Heatsynch (20.3, 12.9 and 9.8%). For cows with ovarian cysts, pregnancy rates were higher for GnRH + Ovsynch (30.3, 26.6 and 22.9%) than for Ovsynch (20.2, 18.5 and 14.7%). Assignment to resynchronization protocols based on the stages of the estrous cycle, or presence of ovarian cysts improved pregnancy rates. © 2004 Elsevier Inc. All rights reserved.

Research Area(s)

Dairy cows, Estrous cycle, Resynchronization, Timed-AI

Bibliographic Note

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