By I. Gordon

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

Sample text

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.

1990) revealed no increase in firstservice conception rate after administering G n M on days 11-1 3. In France, Lajili et al. (1991) found that treatment with Gn(10 pg Buserelin) 12-14 days after breeding only enhanced the conception rate in cows which had previously been treated with PGF,,. In non-pregnant cows, GnRH had a beneficial effect on heat detection and improved the pregnancy rate at subsequent breeding. There was no obvious explanation as to why only a select group (prostaglandin treated) cattle responded favourably to treatment.

Each of these possibilities has already been developed to the stage at which it can be applied to some extent in commercial practice; future developments and refinements in techniques should help to make all of them more valuable to the farmer. 3. Impact of artificial insemination technology For more than 50 years, artificial insemination (AI) has had a major impact on the breeding of cattle. Without doubt, AI’s greatest contributions have been in increasing the efficiency of milk and meat production, in reducing the incidence of disease and in facilitating the movement of good quality genetic material between herds and between countries.

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