Follicle-stimulating hormone to substitute equine chorionic gonadotropin in the synchronization of ovulation in Santa Inês ewes

Revista Brasileira de Zootecnia

Leite, Meiby Carneiro de Paula¹  Aguiar, Cristiane da Silva¹  Dutra, Patrícia Alves¹  Santana, Ana Lúcia Almeida¹  Souza, Rosiléia Silva¹  Barbosa, Larissa Pires¹  Cardoso Neto, Bianor Matias¹  Mendes, Claudinéia Silva¹ 

[1] Universidade Federal do Recôncavo da Bahia

关键词: estrus;    follicular dynamics;    real-time ultrasound     Introduction The use of hormone treatments for estrus synchronizationand ovulation leads to not only maximization in the use of males in reproduction programs;    but also the concentration of births to a certain period of the year;   

DOI  :  10.1590/S1516-35982012000300018

学科分类：兽医学

来源: Universidade Federal de Vicosa

【 摘 要 】

The substitution of equine chorionic gonadotropin (eCG) by follicle-stimulating hormone (FSH) in protocols for synchronization of ovulation in Santa Inês ewes was assessed. Ten females were submitted to the insertion of intravaginal sponges containing 60 mg medroxyprogesterone acetate for 10 days; after this period sponges were withdrawn and the animals were randomly divided into two groups. Group 1 (n = 5): intramuscular injection of 0.5 mL d-cloprostenol and 300 UI eCG; Group 2 (n = 5): intramuscular injection of 0.5 mL d-cloprostenol and 20 mg FSH. Interval between sponge withdrawal and estrus beginning was 27.7 h and 35.9 h for eCG and FSH, respectively. Interval between sponge withdrawal and the end of estrus was 55.8 h for eCG treatment and 55.6 h for FSH treatment. Estrus length was 29.3 h and 19.6 h, for eCG and FSH treatments, respectively. The biggest follicle and the second in size measured 0.74 cm and 0.54 cm for eCG treatment, whereas for the FSH treatment they measured 0.73 and 0.50 cm. The interval between the beginning of estrus and ovulation was similar within all groups: 21.0 h for eCG treated ewes and 25.2 h for the ones treated with FSH. Ewes treated with eCG presented an interval of 47.5 h between sponge withdrawal and ovulation, while the ones treated with FSH presented a 61.1 h interval. Ovulation occurred 8.3 h before the end of estrus in the eCG group. On the other hand, ewes treated with FSH ovulated 5.5 h after the end of estrus. Estrus and ovulation were efficiently synchronized in Santa Inês ewes by using long-term progestogen protocol associated to the administration of 20 mg FSH, along with Prostaglandin F2α (PGF2α) at the moment of sponge withdrawal, thus substituting the use of eCG.

【 授权许可】

CC BY-NC