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Journal of Dairy Science Vol. 80 No. 2 295-300
© 1997 by American Dairy Science Association ®
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Pregnancy Rates Per Artificial Insemination for Cows and Heifers Inseminated at a Synchronized Ovulation or Synchronized Estrus

J. R. Pursley 1, M. C. Wiltbank 1, J. S. Stevenson 2, J. S. Ottobre 3, H. A. Garverick 4, and L. L. Anderson 5

1 Department of Dairy Science, University of Wisconsin, Madison 53706
2 Department of Animal Sciences, Kansas State University, Manhattan 66506
3 Department of Animal Sciences, The Ohio State University, Columbus 43210
4 Department of Animal Science, University of Missouri, Columbia 65211
5 Department of Animal Science, Iowa State University, Ames 50011

Two synchronization protocols were tested for lactating dairy cows and heifers. Nulliparous dairy heifers (13 to 23 mo; n = 155) and primiparous and multiparous dairy cows (60 to 289 d postpartum; n = 310) were assigned randomly to two treatments. Controls received 25 mg of PGF2alpha and were artificially inseminated according to the a.m.–p.m. rule following detected estrus. All controls that were not detected in estrus were injected with 25 mg of PGF2alpha at 14-d intervals until artificial insemination (AI) at a detected estrus or until timed AI at 72 to 80 h after a third sequential injection of PGF2alpha. Treated cows and heifers received a protocol that used GnRH and PGF2alpha to synchronize ovulation (Ovsynch).Cows and heifers that were treated with Ovsynch were injected i.m. with 100 µg of GnRH at a random stage of the estrous cycle. Seven days later, cows and heifers in this group received 25 mg of PGF2alpha, followed by a second injection of 100 µg of GnRH 30 to 36 h later. Subsequently, the treated cows and heifers received AI 16 to 20 h after the second injection of GnRH. Pregnancy rates per AI were similar (38.9% vs. 37.8%) for control cows and cows treated with the Ovsynch protocol, respectively. However, pregnancy rate per AI was greater for control heifers (74.4%) than for heifers treated with Ovsynch (35.1%). Evaluation of serum progesterone concentrations at each hormonal injection indicated that the first injection of GnRH synchronized luteal function of lactating dairy cows but not of heifers. In summary, one fixed-time AI at a synchronized ovulation provided similar pregnancy rates per AI as did AI following the a.m.–p.m. rule after estrus had been induced by PGF2alpha in lactating cows, but the fixed-time AI was not effective for heifers because of the lack of synchronization.

Key Words: dairy cattle • synchronization of ovulation • gonadotropin-releasing hormone • prostaglandin F2alpha

Submitted on October 19, 1995
Accepted on June 27, 1996




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