小睾丸间性羊鉴别的研究——Ⅰ.哺乳期羔羊体型变化的特点

An Identification of Small-Testicle Intersexual Kids——I . Changing Characteristics in Body Conformation of Nursery Aged Kids

从214只公羔羊群中发现5例小睾丸羊,按体型分为体格发育正常、发育一般和发育较差的3种类型。其中2例小睾丸间性羊体格发育正常,具有介于公母羊之间的外貌特征,睾丸质地较硬,尤其缺乏弹性,阴囊围指数在75日龄以后,不仅显著小于正常公羊,而且明显小于体格发育一般和较差的小睾丸羊。用这些形态特征可作为奶山羊早期选种、鉴别、淘汰小睾丸间性羊的重要依据。该方法简单、准确,适于生产中应用。

In the population of 214 male kids,five of them were found to be small testicle kinds which were divided into three different types of normal,average and poor body conformation development in accordance with their body conformation. Two small - testicle intersexual kids had the normal conformation development. Their appearance characteristics were between that of normal male and female kids. Their testicles were haed and lack of elasticity in particular, and their scrotal circumference index after 75 days old were less than that of both normal buck kids and small-testicle buck kids with average or poor body conformation development. Therefore,it is recommended that these morphological charateristics be regarded as an important basis for selection, identification and culling of small-testicle intersexual kids at the early development stage. This method is simple,accurate and adaptable in practical production.