关键词: 湖羊, 多胎B超, 复配受胎率, 羔羊初生重

Abstract:

In this paper, based on the important link of ewe pregnancy identification in Hu sheep breeding, Ovi-Scan portable veterinary multi-fetal B-ultrasound produced by British BCF was introduced to assist breeders in timely, accurate and rapid detection of the pregnancy status of breeding ewes. Through the multi-fetal B-ultrasound pregnancy examination of 406 adult ewes, 223 young ewes and 184 mixed ewes, the pregnancy rate was 80.05%, 82.96% and 69.56%, respectively, and the average accuracy was 99.34%. The accuracy of B-ultrasound in pregnancy examination of ewes with 3 lambs or more was 95.39%. A total of 152 ewes with 3 lambs and above gave birth, and 463 lambs were born. The average birth weight of lambs was 3.27 kg, which was 4.81% higher than that of last year. Through the use of multi-fetal B-ultrasound, the detection rate of pregnancy of ewes was significantly improved, and the pregnant ewes were timely mated, and the pregnant ewes with 3 lambs or more were fed in separate groups, which effectively increased the birth weight of lambs and improved the breeding efficiency of Hu-sheep ewes.

Key words: Hu sheep, multi-fetal B-ultrasound, compound conception rate, lamb birth weight