J. Anim Sci.
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J. Anim Sci. 1972. 35:572-575.
© 1972 American Society of Animal Science
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Comparison between Natural Service and Artificial Insemination with Fresh or Frozen Sperm at an Appointed Time in the Ewe

P. J. Dziuk1, J. M. Lewis1, E. F. Graham2 and R. H. Moyer3

University of Illinois, Urbana 61801, University of Minnesota, St. Paul 55101 and Abbott Laboratories, North Chicago, Illinois 60064

Abstract

An experiment was conducted on 170 ewes to determine the differences in conception rate and lambing rate between ewes (1) inseminated naturally or (2) artificially (AI) with fresh or (3) frozen semen at an appointed time following control of ovulation during the breeding season. Of 58 ewes mated naturally, 69% lambed, of 56 inseminated artificially with fresh semen, 48% lambed and 13% of 56 ewes inseminated artificially with frozen semen produced lambs to the first service. These differences in conception rate between treatments were statistically different (P<.05). The number of lambs x 100/ewes lambing at first service was 177,159 and 128 for natural service, AI with fresh sperm and AI with frozen sperm, respectively. The lambs/ewe at first service for the ewes AI with frozen semen was significantly less (P<.05) than for the other two groups. With all groups combined and with first service and a second natural service to all groups combined, 95% of ewes lambed producing 1.69 lambs/ewe.

In the second experiment in the anestrous season, one group of 58 ewes was mated naturally as in the first experiment and a second group of 60 was inseminated artificially. Fifty-two percent of the naturally mated ewes produced lambs to first service, whereas 32% of AI ewes lambed. This difference between conception rate was significant (P<.01). The ewes produced 1.63 lambs/ewe at first service and 1.15 lambs/ewe from a service at the next estrus. This difference was statistically significant (P<.05).

Footnotes

1 Department of Animal Science, University of Illinois.

2 Department of Animal Sciences, University of Minnesota.

3 Agriculture and Veterinary Products Division, Abbott Laboratories.






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Copyright © 1972 by the American Society of Animal Science.