1- Birjand University
2- Agricultural and Natural Resources Research and Education Center of Khorasan Razavi Province
2- Agricultural and Natural Resources Research and Education Center of Khorasan Razavi Province
Abstract: (14 Views)
Introduction and Objective: Goat farming, as one of the oldest livestock activities, plays a significant role in meeting human nutritional needs. Given population growth and increasing demand for animal products, enhancing reproductive efficiency in goats has become crucial. Improving reproductive rates - reflected in lifetime productivity - can be achieved through increased multiple births, higher numbers of live kids per parturition, or greater number of parturitions during a doe's productive life. This study aimed to evaluate the effects of CIDR-based and prostaglandin-based estrus synchronization methods on reproductive performance in native and non-native goat breeds.
Material and Methods: In this completely randomized design study, 90 healthy does were divided into six groups of 15 animals each. Experimental groups represented combinations of three goat breeds (Saanen, Murcia, and Mahabadi) and two synchronization methods (CIDR and prostaglandin). The CIDR method utilized intravaginal devices containing 300 mg progesterone for 10 days, while the prostaglandin method involved two injections administered 7 days apart. All does receive 400 IU PMSG intramuscularly at CIDR removal or after the second prostaglandin injection. Post-parturition reproductive parameters including pregnancy rate, kidding rate, twinning rate, and stillbirth rate were recorded. Additionally, kid weights at birth, weaning, and three months of age were measured.
Results: The results showed that the Both synchronization methods effectively induced estrus, but significant breed-specific differences were observed. Estrus response reached 100% across all groups, with CIDR-treated does showing significantly shorter estrus onset than prostaglandin-treated animals (P<0.05). Ovarian parameters revealed that Saanen breed under CIDR treatment demonstrated optimal performance with the highest numbers of Graafian follicles and corpora lutea. Regarding pregnancy rates, Saanen showed the highest values with both methods, while Mahabadi performed better with CIDR than prostaglandin. Notably, prostaglandin treatment reduced stillbirth rates to zero in Saanen and Murcia breeds. For kid characteristics, Mahabadi kids exhibited significantly higher birth weights than other breeds (P<0.05). Weaning and three-month weights were superior in Mahabadi and Saanen compared to Murcia.
Conclusion: The results of this study show that the CIDR method is more suitable for Saanen and Mahabadi breeds, while prostaglandin is more appropriate for the Murcia breed. CIDR shortened the estrus time and increased pregnancy rate, while prostaglandin reduced stillbirth. Breed differences play a key role in selecting the optimal protocol. These findings can help improve reproductive management in goat herds.
Material and Methods: In this completely randomized design study, 90 healthy does were divided into six groups of 15 animals each. Experimental groups represented combinations of three goat breeds (Saanen, Murcia, and Mahabadi) and two synchronization methods (CIDR and prostaglandin). The CIDR method utilized intravaginal devices containing 300 mg progesterone for 10 days, while the prostaglandin method involved two injections administered 7 days apart. All does receive 400 IU PMSG intramuscularly at CIDR removal or after the second prostaglandin injection. Post-parturition reproductive parameters including pregnancy rate, kidding rate, twinning rate, and stillbirth rate were recorded. Additionally, kid weights at birth, weaning, and three months of age were measured.
Results: The results showed that the Both synchronization methods effectively induced estrus, but significant breed-specific differences were observed. Estrus response reached 100% across all groups, with CIDR-treated does showing significantly shorter estrus onset than prostaglandin-treated animals (P<0.05). Ovarian parameters revealed that Saanen breed under CIDR treatment demonstrated optimal performance with the highest numbers of Graafian follicles and corpora lutea. Regarding pregnancy rates, Saanen showed the highest values with both methods, while Mahabadi performed better with CIDR than prostaglandin. Notably, prostaglandin treatment reduced stillbirth rates to zero in Saanen and Murcia breeds. For kid characteristics, Mahabadi kids exhibited significantly higher birth weights than other breeds (P<0.05). Weaning and three-month weights were superior in Mahabadi and Saanen compared to Murcia.
Conclusion: The results of this study show that the CIDR method is more suitable for Saanen and Mahabadi breeds, while prostaglandin is more appropriate for the Murcia breed. CIDR shortened the estrus time and increased pregnancy rate, while prostaglandin reduced stillbirth. Breed differences play a key role in selecting the optimal protocol. These findings can help improve reproductive management in goat herds.
Keywords: Breed-specific response, Reproductive indices, Pregnancy rate, Survival rate, Birth weight
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