RESPONSIVENESS OF ANGLO-NUBIAN AND DAMASCUS DOES TO CIDR-eCG PROTOCOL DURING OUT OF BREEDING SEASON

Ramadan, Tamer Awad; Elmokadem, Marwan; Nour El-Din, Adel; Rashad, Amr

doi:10.21608/ejap.2022.127322.1038

RESPONSIVENESS OF ANGLO-NUBIAN AND DAMASCUS DOES TO CIDR-eCG PROTOCOL DURING OUT OF BREEDING SEASON

Document Type : Original Article

Authors

¹ Animal Production Research Institute, Agricultural Research Center, 4 Nadi El-Said, 12311 Dokki, Giza, Egypt

² Animal Production Department, Faculty of Agriculture (El-Shatby), Alexandria University, Alexandria 22545, Egypt

10.21608/ejap.2022.127322.1038

Abstract

The current study was conducted to assess the efficiency of controlled internal drug release (CIDR) device preceding equine chorionic gonadotrophin(eCG) protocol to induce synchronized fertile estrus and improve reproductive performance of Anglo-Nubian and Damascus does during out of breeding seasonwhich lasted from December to May. Forty-eight multiparous does, 24 Anglo-Nubian and 24 Damascusbreeds each wasfurther allocated into two sub-groups, 12 lactating and 12 dry does. Each doe was treated with vaginal inserted CIDR device for a period of 19 days in association with injectionof 500 international units of eCGon the day of removal of CIDR. Samples of Serum were takenfrom each doe at day zero (CIDR insertion), day 19 (CIDR-removal), day 21 (mating), day 39 and day 56 (day 18 and day 35 after mating, respectively). Anglo-Nubian does showed higher concentration of serum progesterone and lower estradiol: progesterone (E₂:P₄) ratio compared to Damascus does. Lactating does of both breeds, produced higher estradiol and lowertotal antioxidant capacity (TAC) concentrations compared to dryones. All does, achieved estrus after CIDR removal and eCG injection, but longer intervals to showestrus were recorded by lactating compared to dry goats. Anglo-Nubian does recorded higher prolificacy and fecundity compared to Damascus. In addition, the fecundity of lactating does was lower than that of dry goats. In conclusion, CIDR-eCG protocol induced successfully fertile estrus in both breeds. However, response of Anglo-Nubian does to CIDR-eCG protocol was superior to that of Damascus as evidenced by higher prolificacy and fecundity during non- breeding season.

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