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Influence of age of donor ewe on MOET in Texel sheep

Published online by Cambridge University Press:  21 November 2017

B.T. Wolf
Affiliation:
Welsh Agricultural College, Llanbadarn Fawr, Aberystwyth SY23 3AL
M.J.A. Mylne
Affiliation:
Edinburgh Genetics, Scottish Agricultural College, VI Centre, Bush Estate, Penicuik, Midlothian EH26 0QE
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Extract

Smith (1986) identified the theoretical potential of multiple ovulation and embryo transfer (MOET) to increase the rate of genetic improvement within nucleus sheep breeding flocks by upto 100%. The likely genetic benefits of MOET arise from the potential to overcome limits to female reproduction thus allowing increased selection intensity and reduced generation intervals among females. The present study was conducted to evaluate the potential for MOET from 18 month-old maiden ewes (gimmers) in comparison with aged donor ewes.

In October 1991, a group of twenty 18-month old ewes and twenty aged ewes (3.5 year-old) were synchronised into oestrus using intravaginal pessaries containing 45 mg Cronolone (Chronogest, Intervet Laboratories Ltd.) inserted for 12 days. Superovulation was achieved using 20 i.u. of ovine follicle stimulating hormone (Ovagen, Immuno-Chemical Products N.Z. Ltd) given in eight equal doses at 12-hourly intervals starting 58 hours before progestagen pessary withdrawal.

Type
Sheep Production
Copyright
Copyright © The British Society of Animal Production 1994

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References

Dingwall, W.S.; McKelvey, W.A.C.; Mylne, M.J.A. and Simm, G. (1993). Animal Production 56:444 Abs..Google Scholar
McMillan, W.H. and McDonald, M.F. (1985). Animal Reproduction Science 8:235240.CrossRefGoogle Scholar
Smith, C. (1986). Animal Production 42: 8188.CrossRefGoogle Scholar
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