The effect of post-mating hCG or progesterone administration on reproductive performance of Afshari × Booroola-Merino crossbred ewes
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- 作者：Behnam Rostami ; Rahman Hajizadeh…
- 关键词：Post ; mating ; hCG ; CIDR ; Reproductive performance ; Ewe
- 刊名：Tropical Animal Health and Production
- 出版年：2017
- 出版时间：February 2017
- 年：2017
- 卷：49
- 期：2
- 页码：245-250
- 全文大小：
- 刊物类别：Medicine
- 刊物主题：Zoology; Veterinary Medicine/Veterinary Science;
- 出版者：Springer Netherlands
- ISSN：1573-7438
- 卷排序：49
文摘
To investigate the efficiency of hCG/CIDR after breeding to increase the reproductive performance, 35 synchronized ewes were mated with fertile rams and were assigned to three treatment groups. Ewes in hCG group (n = 12) received 400 IU hCG on day 11 post-mating, and ewes in CIDR group (n = 11) received CIDR from day 7 until day 19 post-mating. Ewes in the control group (n = 12) did not receive any treatment. Blood samples were collected on days 7, 12, 17, and 22 post-mating. Plasma P4 concentrations were higher on days 12 and 17 post-mating in hCG- and CIDR-treated groups (P < 0.05). However, the concentrations of P4 on day 22 post-mating in hCG and control groups were higher than that in CIDR group (P < 0.05). Ewes in hCG group produced more quadruplets (P < 0.05) and triplets, and as a result, they had a larger litter size (P < 0.05). The lamb mortality rate by weaning in hCG group (3.6%) was less than that in control (11.8%; P < 0.05) and CIDR (9.1%; P > 0.05) groups. Post-mating administration of hCG or CIDR did not affect the lamb birth weight in single and quadruplet births (P > 0.05), but the birth weight of twin lambs was higher in the hCG and CIDR groups (P < 0.05). Weaning weights of twin lambs were higher in the hCG and CIDR groups (P < 0.05). In conclusion, hCG/CIDR administration post-mating increased the maternal P4 concentrations and enhanced reproductive performance.