Heat Stress and Reproduction in Pigs: Its Role in Seasonal Infertility
نویسنده
چکیده
A seasonal infertility in pig breeding herds is observed in Australia and overseas. It is characterised before mating by an increase in the incidence of anoestrus, delayed puberty in gilts and prolonged wean-to-mate intervals, and after mating by reduced conception rates, delayed returns to service, an increase in sows not-in-pig when due to farrow and possibly by increased abortions. Litter size is generally not affected. Because the infertility occurs during summer and increases in the above symptoms have been associated with elevated ambient temperatures, heat stress has been generally regarded as the immediate cause of the reduced fertility. .
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