Seasonal changes in serum progesterone levels in Caspian mares
سال انتشار: 1401
نوع سند: مقاله ژورنالی
زبان: انگلیسی
مشاهده: 177
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شناسه ملی سند علمی:
JR_IJVST-14-3_003
تاریخ نمایه سازی: 19 مهر 1401
چکیده مقاله:
The present study was conducted to assess the seasonal breeding of Caspian horses in ۱۰ mares during a year. Mares were divided into two age groups: ۳-۶ years (young) and ۷-۱۹ years (old). Blood samples (n=۵۳۰) were collected weekly. The ovarian activity was evaluated by the concentration of progesterone. Mares with serum progesterone concentrations consistently higher and lower than ۱ ng/ml were considered cyclic and non-cyclic, respectively. Results showed an interaction between time and age on the concentration of serum progesterone, ovarian activity, body weight, and body condition score (BCS) (p < ۰.۰۵). In March, the concentration of serum progesterone was higher in young mares (۷.۸۴ ± ۱.۱۴) than in old mares (۱.۲۶ ± ۱.۱۴, p < ۰.۰۵). The serum progesterone was higher in old mares than in young mares during July-November (p < ۰.۰۵). Ovarian activity was higher in young mares than in old mares during February-April (p < ۰.۰۵). Ovarian activity was higher in old mares than in young mares during July-November (p < ۰.۰۵). The length of the breeding season was higher in old mares than in young mares (p < ۰.۰۵). BCS was higher in young mares (۴.۴ ± ۰.۲۲) than in old mares (۳.۲ ± ۰.۲۲) in February (p < ۰.۰۵). Body weight was lowest in the young mares during September-January (p < ۰.۰۵). There was a significant correlation between ovarian activity and BCS of Caspian mares. Finally, seasonal breeding was shorter and earlier in young Caspian mares compared to old mares.
کلیدواژه ها:
نویسندگان
رضا حقدوست
Animal Science Department, Faculty of Agricultural Sciences, University of Guilan
- Roostaei-Ali Mehr
Unversity of Guilan
احمد قربانی
Animal Science Research Department, Guilan Agricultural and Natural Resources Research and Education Center, AREEO, Rasht, Iran
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