| 季节对放牧条件下安格斯和海福特肉牛超数排卵的影响 |
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| 作者姓名： | 张 立 刘俊平 曹鸿国 黄春华 韩锦龙 张 涌 |
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| 作者单位： | 西北农林科技大学生物工程研究所，西北农林科技大学生物工程研究所，西北农林科技大学生物工程研究所，内蒙古自治区家畜改良工作站，内蒙古自治区家畜改良工作站，西北农林科技大学生物工程研究所 杨凌712100，内蒙古自治区家畜改良工作站，呼和浩特010010，杨凌712100，内蒙古农业大学动物科技学院，呼和浩特010018，杨凌712100，呼和浩特010010，呼和浩特010010，杨凌712100 |
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| 基金项目： | 科技部“九五”攻关项目“应用胚胎生物技术建立良种肉牛繁育体系和生产体系”(96-C01-03-01)，国家发展与改革委员会高技术产业化示范工程“肉牛胚胎工程系列技术产业化”(2000063)。 |
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| 摘 要： | 采用放置CIDR和FSH-PG注射法,于2004年5至6月和8至9月间对进口的安格斯和海福特肉牛进行超数排卵研究,并对安格斯和海福特肉牛随机分组。通过对超排有效率、平均采胚数、平均可用胚数、胚胎可利用率和A、B级胚胎在可用胚胎中的比率进行统计,结果为草原放牧条件下,5至6月间安格斯肉牛平均采胚数为10.78枚,平均可用胚数为5.75枚,其中平均A级胚胎数为4.52枚,海福特肉牛的平均采胚数为12.18枚,平均可用胚数为7.86枚,其中平均A级胚胎数为6.5枚。在8至9月间安格斯肉牛平均采胚数为12.55枚,平均可用胚数为8.14枚,其中平均A级胚胎数为6.62枚,海福特肉牛平均采胚数为10.25枚,平均可用胚数为5.75枚,其中平均A级胚胎数为4.32枚。研究证实海福特肉牛的适宜超排季节为5至6月份安格斯肉牛适宜超排季节为8至9月份
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| 关 键 词： | 季节影响 放牧 安哥斯肉牛 海福特肉牛 超数排卵 |
Seasonal Effect on Superovulation of Angus and Hereford Beef Cows under Natural Grazing Conditions |
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| Authors: | Zhang Li Liu Junping Cao Hongguo Zhang Yong |
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| Institution: | (1Institute of Bio-engineering, Northwest A & F University, Yangling, 712100; 2Inner Mongolia livestock improvement station, Huhhot, 010010; 3College of animal science and animal medicine, Inner Mongolia Agricultural University, Huhhot, 010018) |
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| Abstract: | Angus beef cattles and Hereford beef cattles imported from Canada were superovulated by using CIDR and injecting FSH-PG in May to June and Augest to September 2004, which were grouped in random. Superovulation rate, average number of collected embryos, average available embryo number, available embryo rate, and A and B grade rate in available embryos were analyzed. The results indicated that under natural grazing conditions from May to June, the average number of collected embryos was 10.78, the average available embryo number was 5.75, and the average number of grade A embryos was 4.52 of Angus beef cattles after superovulated; Under the same conditions, the average number of collected embryos was 12.18, the average number of available embryos was 7.86, and the average number of grade A embryos was 6.5 of Hereford beef cattle. From Augest to September, the average number of collected embryos was 12.55, the average available embryo number was 8.14, and the number of grade A embryos was 6.62 of Angus beef cattles after superovulation. Meanwhile, the numbers of Hereford beef cattles were 10.25, 5.75, and 4.32, respectively. It is substantiated that suitable superovulation season to Hereford beef cattles is in Summer, and to Angus beef cattle is in Autumn. |
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| Keywords: | seasonal effect grazing Angos beef cattle Hereford beef cattle superovulation |
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