Abstract

This paper reports studies ot the rate and variability of embryonic development in the first 10 days of pregnancy in Meishan and Large White pigs, and the effects of reciprocal embryo transfer between the breeds on survival and fetal growth at day 30 of pregnancy. After adjustment for a breed difference in the time of ovulation, no evidence of differences in the rate of embryonic development between breeds was found. No overall difference between breeds in the amount of variability between embryos within females was observed, although there were hints of greater variation in between embryos from a few Large White females. After embryo transfer, no differences in survival between recipient breeds were observed, but lower survival in embryos from Meishan donors suggested that they were intolerant to the transfer procedures used. Fetal growth at day 30 was greater both in Large White embryos and in Large White gilts, but no significant interaction between breed of embryo and breed of gilt was observed.
 

I. Wilmut, Chris S Haley, C. J Ashworth, R. P Aitken, W. Ritchie

Proceedings of the World Congress on Genetics Applied to Livestock Production, Volume XVI. Poultry, fish and horse genetics and breeding, growth and reproduction, immune response and disease resistance., , 347–353, 1990
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