Perumal P
Animal Reproduction Laboratory, National Research Centre on Mithun (ICAR), Jharnapani, Nagaland 797 106, India.
Int Sch Res Notices. 2014 Oct 29;2014:249537. doi: 10.1155/2014/249537. eCollection 2014.
The present study was undertaken to assess the relationship between the scrotal circumference and testicular parameters with body weight and age in Tho Tho bulls (Bos indicus), which were maintained at around the villages of National Research Centre on Mithun (ICAR), Jharnapani, Nagaland, India. A total of 32 Tho Tho bulls were selected and divided into four groups according to their age and each group consisted of 8 bulls, namely, Group I: 18-24 months (n = 8), Group II: 25-36 months (n = 8), Group III: 37-48 months (n = 8), and Group IV: 49 months and above (n = 8). The scrotal circumference and testicular parameters were measured with caliper and tape and age of animals was calculated with dental formula. The body weight of bulls was estimated with Shaeffer's formula. Result revealed that the scrotal circumference was highly correlated with testicular parameters and body weight compared to age. Compared to exotic cattle (Bos taurus), Tho Tho bull's testicular parameters and scrotal circumference were lower. The results of the present study in Tho Tho bulls revealed that scrotal circumference is a useful indicator and is an important selection criterion to determine the testicular development and breeding soundness in young bulls as it is highly correlated with tesicular parameters.
本研究旨在评估印度那加兰邦贾尔纳帕尼米通国家研究中心（印度农业研究委员会）周边村庄饲养的托托公牛（印度瘤牛）阴囊周长和睾丸参数与体重及年龄之间的关系。共挑选了32头托托公牛，并根据年龄将其分为四组，每组8头，即：第一组：18 - 24个月（n = 8），第二组：25 - 36个月（n = 8），第三组：37 - 48个月（n = 8），第四组：49个月及以上（n = 8）。用卡尺和卷尺测量阴囊周长和睾丸参数，通过牙齿公式计算动物年龄。用谢弗公式估算公牛体重。结果显示，与年龄相比，阴囊周长与睾丸参数和体重高度相关。与外来牛（普通牛）相比，托托公牛的睾丸参数和阴囊周长较低。本研究对托托公牛的结果表明，阴囊周长是一个有用的指标，并且是确定年轻公牛睾丸发育和繁殖健全性的重要选择标准，因为它与睾丸参数高度相关。
