Management of goat reproduction and insemination for genetic improvement in France.
Reproductive seasonality observed in all breeds of goats originating from temperate latitudes and in some breeds from subtropical latitudes can now be controlled by artificial changes in photoperiod. Short days stimulate sexual activity, while long days inhibit it. This knowledge has allowed the development of photoperiodic treatments to control sexual activity in goats, for both the buck and doe. In the French intensive milk production system, goat AI plays an important role to control reproduction and, in conjunction with progeny testing, to improve milk production. Most dairy goats are inseminated out of the breeding season with deep frozen semen, after induction of oestrus and ovulation by hormonal treatments. This protocol provides a kidding rate of approximately 65%. New breeding strategies have been developed, based on the buck effect associated with AI, to reduce the use of hormones. With the development of insemination with frozen semen, a classical selection programme was set up, including planned mating, progeny testing and the diffusion of proved sires by inseminations in herds. Functional traits have become important for efficient breeding schemes in the dairy goat industries. Based on knowledge gained over the past decade, the emphasis in selective breeding has been placed on functional traits related to udder morphology and health. New windows have been opened based on new molecular tools, allowing the detection and mapping of genes of economic importance.
Leboeuf
B
B
INRA-UEICP, Venours, Rouillé, France. leboeuf@lusignan.inra.fr
Delgadillo
J A
JA
Manfredi
E
E
Piacère
A
A
Clément
V
V
Martin
P
P
Pellicer
M
M
Boué
P
P
de Cremoux
R
R
D000818:Animals; D001947:Breeding / Q000379:methods*; D004973:Estrus Synchronization; D005260:Female; D005602:France; D006041:Goats / Q000235:genetics* / Q000502:physiology*; D007315:Insemination, Artificial / Q000662:veterinary*; D007774:Lactation; D008297:Male; D008892:Milk / Q000378:metabolism / Q000592:standards; D010062:Ovulation Induction / Q000662:veterinary; D017440:Photoperiod; D011247:Pregnancy; D018873:Pregnancy Rate; D012098:Reproduction / Q000502:physiology*; D012621:Seasons; D012641:Selection, Genetic