Recent advances in the control of goat reproduction

Chemineau P., Baril G., Maurel M.C., Cognie Y., Leboeuf B.

The control of goat reproduction is interesting for technical reasons (synchronisation of kiddings, adjustment to forage availability or to economy), and for genetical reasons (identification and dissemination of improved genotypes). The use of short-light rhythms leads to dramatically improved production of AI doses per buck and the reduction of the period of production by preventing the appearance of a 'resting' season. Attempts to improve semen technology had been rare and unsuccessful until the establishment of the hamster oocyte test as a predictor of semen fertility. Light plus melatonin treatments allow the induction of out-of-season cyclicity of estrus and ovulation leading to improved fertility. Repeated use of PMSG provokes the production of antibodies, delays the timing of ovulation and causes a reduction in fertility after fixed-time artificial insemination. All steps of embryo production, freezing and transfer are now controlled and allow the attainment of satisfactory rates of kids born per donor female, which are compatible with the development of the technique for exchanging genotypes across countries. In vitro production of embryos is the field in which major progress has taken place in the recent years, allowing high development rates to be achieved after in vitro maturation and fertilisation of oocytes, and development of embryos.



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Chemineau P., Baril G., Maurel M.C., Cognie Y., Leboeuf B. Recent advances in the control of goat reproduction. In : Morand-Fehr P. (ed.). Recent advances in goat research. Zaragoza : CIHEAM, 1997. p. 29-37. (Cahiers Options Méditerranéennes; n. 25). 6. International Conference on Goats, 1996/05/06-11, Beijing (China).