Multiple mating and siring success during natural oestrus in the ewe

Journal of Reproduction and Fertility
P A JewellM M Rosenberg

Abstract

Ewes were each mated on four separate occasions, at 3, 9, 15 and 21 h after the start of oestrus and at each time by a different ram. The progeny were assigned to sires by blood typing, supplemented by resemblance between lambs and rams. The paternity of 64 lambs, born to 41 ewes, was established: 2 were conceived at a 3-h mating, 27 at 9h, 23 at 15 h and 12 at 21 h. The optimum time for a ram to inseminate, when in competition with others, is therefore 9-15 h after onset of oestrus, and this finding accords with behavioural observations. Ewes tended to lamb during the same half of the day as that when they had come into oestrus.

Citations

Mar 1, 1989·Trends in Ecology & Evolution·J R Ginsberg, U W Huck
Oct 17, 2003·Proceedings. Biological Sciences·B T PrestonK Wilson
Mar 1, 2005·Proceedings. Biological Sciences·B T PrestonK Wilson
Jul 15, 2015·Zygote : the Biology of Gametes and Early Embryos·Ronald Henry Fraser Hunter, Joaquín Gadea

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