Abstract This study reviewed the protocols for ovulation induction in sows by human chorionic gonadotropin (hCG) and gonadotropin releasing hormone (GnRH). In pigs, it was documented that ovulation usually occurred about 70% of the way through oestrus. However, the duration of oestrus in sows highly varies, producing difficulty in performing artificial insemination (AI) in sows at optimal time. In practice, sows are usually inseminated for 2 to 4 times at 12 to 24 hours interval during oestrus, with an attempt to deposit sperm at the optimal time of ovulation. Many protocols have been developed to control time of ovulation, allowing fixed time insemination in gilts and sows. Hormones used for ovulation induction included hCG, GnRH and porcine luteinizing hormone (pLH). The purpose of treatment for weaned sows with hCG, GnRH or pLH performed after gonadotrophic treatment at weaning is to stimulate follicular growth. Such treatments at weaning period are associated with an increase in embryo mortality due to poorer oocyte quality. GnRH and hCG mechanisms of action on ovulation induction are different: GnRH induces ovulation by providing a pre-ovulatory peak of LH, while hCG

Ovulation Induction in Sows / Padet, Tummaruk; Atthaporn, Roongsitthichai; DE RENSIS, Fabio. - In: THE THAI JOURNAL OF VETERINARY MEDICINE. - ISSN 0125-6491. - 41(2011), pp. 29-33. ((Intervento presentato al convegno Proceeding of the 1th symposium of the Thai Society for Animal Reproduction nel 29-30 Settembre 2011.

Ovulation Induction in Sows

DE RENSIS, Fabio
2011

Abstract

Abstract This study reviewed the protocols for ovulation induction in sows by human chorionic gonadotropin (hCG) and gonadotropin releasing hormone (GnRH). In pigs, it was documented that ovulation usually occurred about 70% of the way through oestrus. However, the duration of oestrus in sows highly varies, producing difficulty in performing artificial insemination (AI) in sows at optimal time. In practice, sows are usually inseminated for 2 to 4 times at 12 to 24 hours interval during oestrus, with an attempt to deposit sperm at the optimal time of ovulation. Many protocols have been developed to control time of ovulation, allowing fixed time insemination in gilts and sows. Hormones used for ovulation induction included hCG, GnRH and porcine luteinizing hormone (pLH). The purpose of treatment for weaned sows with hCG, GnRH or pLH performed after gonadotrophic treatment at weaning is to stimulate follicular growth. Such treatments at weaning period are associated with an increase in embryo mortality due to poorer oocyte quality. GnRH and hCG mechanisms of action on ovulation induction are different: GnRH induces ovulation by providing a pre-ovulatory peak of LH, while hCG
Ovulation Induction in Sows / Padet, Tummaruk; Atthaporn, Roongsitthichai; DE RENSIS, Fabio. - In: THE THAI JOURNAL OF VETERINARY MEDICINE. - ISSN 0125-6491. - 41(2011), pp. 29-33. ((Intervento presentato al convegno Proceeding of the 1th symposium of the Thai Society for Animal Reproduction nel 29-30 Settembre 2011.
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Utilizza questo identificativo per citare o creare un link a questo documento: http://hdl.handle.net/11381/2481436
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