Seasonal changes in serum progesterone levels in Caspian mares

Iranian Journal of Veterinary Science and Technology

مقالات آماده انتشار، پذیرفته شده، انتشار آنلاین از تاریخ 04 مرداد 1401  

نوع مقاله: Research Article

شناسه دیجیتال (DOI): 10.22067/ijvst.2022.72327.1076

نویسندگان

Reza Haghdoost¹؛ Mohammad Roostaei-Ali Mehr ²؛ Ahamd Ghorbani³

¹Animal Science Department, Faculty of Agricultural Sciences, University of Guilan

²Unversity of Guilan

³Animal Science Research Department, Guilan Agricultural and Natural Resources Research and Education Center, AREEO, Rasht, Iran

چکیده

The experiment was conducted to determine the seasonal breeding of Caspian horses using 10 mares over the course of 1 year. Mares were divided into two age groups: 3-6 years (young) and 7-19 years (old). Blood samples (n=530) were collected weekly. The ovarian activity was evaluated via the concentration of progesterone. Mares with serum progesterone concentrations consistently higher and less than 1 ng/ml were considered cyclic and non-cyclic, respectively. Results showed that there was an interaction between time and age on the concentration of the serum progesterone, ovarian activity, body weight and body condition score (p< 0.05). In Mar, the concentration of the serum progesterone was higher in the young mares (7.84 ± 1.14) than in old mares (1.26 ± 1.14, p<0.05). The serum progesterone was higher in old mares than young mares from Jul to Nov (p<0.05). Ovary activity was higher in young mares than old mares from Feb to Apr (p<0.05). Ovary activity was higher in old mares than young mares from Jul to Nov (p<0.05). The length of the breeding season was higher in old mares than young mares (p<0.05). The body condition score was higher in young mares (4.4 ± 0.22) than old mares (3.2 ± 0.22) in Feb (p<0.05). Body weight was lowest in the young mare from Sep to Jan (p<0.05). There was a significant correlation between ovarian activity and body condition of Caspian mares. Finally, seasonal breeding was shorter and earlier in young Caspian mares compared with old mares.

کلیدواژه‌ها

Caspian horse؛ Season؛ Breeding؛ Progesterone