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Fertility in dairy cows after artificial insemination using sex-sorted sperm or conventional semen

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Karakaya, Ebru Bilen
Yılmazbaş, Gülnaz Mecitoğlu
Kesin, Abdülkadir
Gümen, Ahmet

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Alkan, Ali
Taşdemir, Umut
Santos, José Eduardo P.

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Wiley

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Abstract

Contents The aim of this study was to compare pregnancy per artificial insemination (P/AI) after timed AI with sex-sorted sperm (SS) or conventional semen (CS) in lactating dairy cows. Cyclic cows (n=302) were synchronized by Ovsynch and randomly assigned into two groups at the time of AI. Cows with a follicle size between 12 and 18mm and clear vaginal discharge at the time of AI were inseminated with either frozen-thawed SS (n=148) or CS (n=154) of the same bull. A shallow uterine insemination was performed into the uterine horn ipsilateral to the side of probable impending ovulation. Pregnancy per AI on Day 31 tended (p=0.09) to be less for SS (31.8%) than CS (40.9%). Similarly, P/AI on Day 62 was less (p=0.01) for cows inseminated with SS (25.7%) compared with CS (39.0%). The increased difference in fertility between treatments from Days 31 to 62 was caused by the greater (p=0.02) pregnancy loss for cows receiving SS (19.2%) than CS (4.8%). Cow parity (p=0.02) and season (p<0.01) when AI was performed were additional factors affecting fertility. Primiparous cows had greater P/AI than multiparous cows both on Day 31 (41.7% vs 25.0% in SS and 53.0% vs 31.8% in CS groups) and on Day 62 (33.3% vs 20.5% in SS and 48.5% vs 31.8% in CS groups). During the hot season of the year, P/AI on Day 31 was reduced (p=0.01) in the SS group (19.6%) when compared with the rates during the cool season (38.1%). In conclusion, sex-sorted sperm produced lower fertility results compared to conventional semen even after using some selection criteria to select most fertile cows.

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Synchronization, Heifers, Rates, Agriculture, Reproductive biology, Veterinary sciences, Bos

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Karakaya, E. vd. (2014). "Fertility in dairy cows after artificial insemination using sex-sorted sperm or conventional semen". Reproduction in Domestic Animals, 49(2), 333-337.

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