年龄和阴囊周长对放牧羊繁殖性能检测的影响

Influence of age and scrotal circumference on breeding soundness examination of range rams.

作者信息

Ruttle J L, Southward G M

机构信息

Department of Animal and Range Sciences College of Agriculture and Home Economics New Mexico State University Las Cruces, NM 88003-0009 USA.

出版信息

Theriogenology. 1988 Apr;29(4):945-9. doi: 10.1016/0093-691x(88)90231-2.

DOI:10.1016/0093-691x(88)90231-2

PMID:16726415

Abstract

Breeding soundness examinations (BSE) were conducted on 3,167 range rams on New Mexico sheep ranches during 1982, 1983 and 1984. Age and scrotal circumference (SC) were recorded for each ram and based on SC, rams were further classified as small (<30.8 cm), medium (31-37 cm) or large (>37.8 cm). Scrotal circumference increased with age (P < 0.05) up to 7 yr of age. Rams rated as satisfactory by BSE had a large (P < 0.05) SC, averaging 34.4 cm for all ages combined. Most rams classed as small (P < 0.01) were also rated unsatisfactory. There was no difference (P > 0.10) in BSE rating of rams classified by SC as medium or large. Results of this study suggest that SC is influenced by age, and this trait should be considered within age groups. Rams with an SC of <30 cm are more likely (P < 0.05) to be rated unsatisfactory by BSE.

摘要

1982年、1983年和1984年期间，对新墨西哥州牧羊场的3167只草原公羊进行了繁殖性能检查（BSE）。记录了每只公羊的年龄和阴囊周长（SC），并根据阴囊周长，将公羊进一步分为小（<30.8厘米）、中（31 - 37厘米）或大（>37.8厘米）三类。阴囊周长随年龄增长（P < 0.05），直至7岁。经BSE评定为满意的公羊阴囊周长较大（P < 0.05），所有年龄组的平均阴囊周长为34.4厘米。大多数被归类为小的公羊（P < 0.01）也被评定为不满意。按阴囊周长分为中等或大的公羊，其BSE评定结果没有差异（P > 0.10）。本研究结果表明，阴囊周长受年龄影响，在各年龄组中应考虑这一特征。阴囊周长<30厘米的公羊更有可能（P < 0.05）被BSE评定为不满意。