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Hardin DR, Warnick AC, Fields MJ. Artificial insemination of subtropical commercial beef cattle following synchronization with cloprostenol (ICI 80996): II. Estrous response. Theriogenology. 1980;14(4):259-68doi: 10.1016/0093-691x(80)90076-x.
Hardin, D. R., Warnick, A. C., & Fields, M. J. (1980). Artificial insemination of subtropical commercial beef cattle following synchronization with cloprostenol (ICI 80996): II. Estrous response. Theriogenology, 14(4), 259-68. https://doi.org/10.1016/0093-691x(80)90076-x
Hardin, D R, et al. "Artificial insemination of subtropical commercial beef cattle following synchronization with cloprostenol (ICI 80996): II. Estrous response." Theriogenology vol. 14,4 (1980): 259-68. doi: https://doi.org/10.1016/0093-691x(80)90076-x
Hardin DR, Warnick AC, Fields MJ. Artificial insemination of subtropical commercial beef cattle following synchronization with cloprostenol (ICI 80996): II. Estrous response. Theriogenology. 1980 Oct;14(4):259-68. doi: 10.1016/0093-691x(80)90076-x. PMID: 16725523.
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Theriogenology. 1980 Oct;14(4):259-68. doi: 10.1016/0093-691x(80)90076-x.

Artificial insemination of subtropical commercial beef cattle following synchronization with cloprostenol (ICI 80996): II. Estrous response.

Theriogenology

D R Hardin, A C Warnick, M J Fields

Affiliations

  1. University of Florida, Gainesville, FL 32611, USA.

PMID: 16725523 DOI: 10.1016/0093-691x(80)90076-x

Abstract

Data collected from two controlled breeding field trials involving 561 Bos indicusxBos taurus cows and heifers were analyzed for estrous and fertility response following a cloprostenol ICI-80, 996 (CLP) synchronization regime. Fertility data were discussed in a companion paper (1). In Trial 1, 128 animals were assigned to four treatments: 1) controls which were inseminated at the naturally occurring estrus; 2) Animals artificially inseminated at approximately 72 hr and 96 hr following a second CLP; 3) Animals artificially inseminated at approximately 72 hr following a second CLP; and 4) Animals artificially inseminated approximately 12 hr after detection of estrus post-second CLP. Trial II included 391 heifers distributed among six treatments: 1) Artificially inseminated between 70 and 90 hr post-second CLP; 2) Sham inseminated between 70 and 90 hr post-second CLP; 3) Processed with no manipulation of the genital tract between 70 and 90 hr post-second CLP; 4) Artificially inseminated approximately 12 hr after the detection of estrus following a second CLP; 5) Artificially inseminated at the naturally occurring estrus and 6) Non-treated heifers exposed to fertile bulls. Cloprostenol ICI-80996 was effective (P<.01) in synchronizing estrus in comparisons of treated vs non-treated controls in Trials I and II (82 vs 29%; 57 vs 19%, respectively). However, a significant reduction in the expression of estrus was observed following Timed AI when compared to heifers bred 12 hr after detection of CLP-induced estrus in Trial II (37 vs 54%, P<.05). The authors conclude that a single timed insemination of Brahman crossbred heifers suppresses the behavioral expression of estrus. Other evidence (1) indicates that the fertility during this period is similarly reduced.

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