Strategies to improve pregnancy per insemination using sex-sorted semen in dairy heifers detected in estrus.

Abstract

The objective was to improve pregnancy per artificial insemination (P/AI; 35-42 d after AI) in virgin Jersey heifers bred by AI of sex-sorted semen after being detected in estrus. Giving 100 μg of GnRH at first detection of estrus, with AI 12 h later, did not affect P/AI in Experiment I [GnRH = 47.2% (100/212) vs. No GnRH = 51.7% (104/201); P = 0.38] or… (More)
DOI: 10.1016/j.theriogenology.2010.06.036

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