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Journal of Reproduction and Fertility (1980) 59 463-468
DOI: 10.1530/jrf.0.0590463
Copyright © 1980 Society for Reproduction and Fertility
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Fertilization and embryonic mortality rates in beef heifers after artificial insemination

M. G. Diskin and J. M. Sreenan

Summary. A total of 256 beef heifers, in 2 experiments, was used to establish fertilization rate and subsequent embryo survival rates. Fertilization rate following a single artificial insemination was 90%. Pooled estimates of embryo survival showed high survival rates up to Day 8 (93%) but markedly reduced (P < 0·001) survival at Days 12 (56%), 16 (66%) and 42 (58%). It is suggested that most embryonic mortality occurs between Days 8 and 16.




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