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By I. Gordon

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Extra resources for Controlled Reprod. in Farm Animals [Vol. 1 - Cattle, Buffaloes]

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1. Fertilizationand embryo survival rates on different days after artificial insemination in beef heifers. ) Days after insemination No. of heifers inseminated No. of heifers with embryos (“’0) Fertilization rate (%) No. 05). rates have varied from 83% to loo%, with an overall mean of 90%. In Ireland, workers recorded a fertilization rate of 90% in heifers, using AI with frozenthawed semen (Diskin and Sreenan, 1980). The same workers concluded that fertilization failure accounts for only about 10% of the overall reproductive failure in heifers whereas embryo deaths account for more than 30%.

At the blastocyst stage, true growth commences with rapid cell division and differentiation. , 1995). Even in normal healthy cattle, some proportion of embryos (25% or more) which have passed through the fallopian tubes into the uterus fail to continue development, generally during the first 3 weeks of pregnancy. Embryonic mortality has long been recognized as a major source ofloss in breeding cows and numerous studies have reported on it. As described by Sreenan and Diskin (1994) ,the fertilization rate after the cow has been bred can be taken at about 90% whereas the average calving rate to a single service may be only 55%.

T h e main protein involved was initially termed bovine trophoblast protein-1 , but is now known as bovine trophoblast interferon tau (bIFNT) which has high amino acid sequence homology with a-interferon. At the time of their discovery in 1957, the term interferon (IFN) was used in referring to certain molecules produced by cells in response to a viral infection. g. bIFNz) are involved in the regulation of pregnancy.

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