Effect of three methods of estrus synchronization on reproductive performance of Sanjabi ewes during breeding and nonbreeding seasons

• Main Author: Farasati , Syrus
• Format: Publication
• Language: Persian
• Published: Kermanshah (Iran) Kermanshah Agricultural and Natural Resources Research Center 2009
• Subjects: AMELIORATION GENETIQUE; BREBIS; BREEDING; DRY SEASON; ESTACION SECA; EWES; http://www.fao.org/aos/agrovoc#c_2400; http://www.fao.org/aos/agrovoc#c_2746; http://www.fao.org/aos/agrovoc#c_4788; http://www.fao.org/aos/agrovoc#c_49902; http://www.fao.org/aos/agrovoc#c_6510; http://www.fao.org/aos/agrovoc#c_7569; MEJORA; METHODE; METHODS; METODOS; OVEJA; PERFORMANCE DE REPRODUCTION; REPRODUCTIVE PERFORMANCE; REPRODUCTIVIDAD; SAISON SECHE; SINCRONIZACION; SYNCHRONISATION; SYNCHRONIZATION

Experiment I) The present study was achieved in out of breeding season in one of the sanjabi sheep herds under the sanjabi-sheep breeding project in kcrmanshah province of Iran.In this experiment three method of estrus synchronization (ES ) including intravaginal sponge impregnated with progeslagen, controlled internal drug release (CIDR) devices supplying natural progesterone and norgestomet implants for 14 days followed by eCG injection (400 i.u.; i.m.) , have been compared. All of sheep after removig treatments were mated naturaly . Percent of estrus response in sponge, CIDR and norgestomet groups were 78 , 65 , 71 and pregnancy rate in these groups were 17 , 18 and 10 respectively. Analysis of variance using the GLM of SAS did not show any significant difference between these groups. Experiment 11) The present study was achieved in breeding season in one of the sanjabi sheep herds under the sanjabi-sheep breeding project in kermanshah province of Iran. In this experiment three methods of ES and eCG injection were done like experiment I, also. All of ewes 54h after removig treatments were inseminated artificialy. Percent of estrus response in sponge, CIDR and norgestomet treated ewes were 95.65 , 92.86 , 86.05 respectively and there was no significant difference between them.Fertility and fecoundity rate were higher in ewes treated with sponge (52.49 and 82.00% respectively) compared with ewes treated with norgestomet (29.73 and 41.001% respectively, p0.05). There was no significant difference in fertility and fecoundity rate in ewes treated with CIDR (48.72 and 72.00% respectively) compared with other groups. In the present experiment, there was no signi ficant difference in the prolificacy and duration of pregnancy between treated ewes.