加拿大肉牛公牛平均睾丸大小增加。
Increase in average testis size of Canadian beef bulls.
作者信息
García Guerra Alvaro, Hendrick Steve, Barth Albert D
机构信息
Department of Large Animal Clinical Sciences, Western College of Veterinary Medicine, University of Saskatchewan, Saskatoon, Saskatchewan, Canada S7N 5B4.
出版信息
Can Vet J. 2013 May;54(5):485-90.
Selection for adequate testis size in beef bulls is an important part of bull breeding soundness evaluation. Scrotal circumference (SC) is highly correlated with paired testis weight and is a practical method for estimating testis weight in the live animal. Most bulls presented for sale in Canada have SC included in the presale information. Scrotal circumference varies by age and breed, and may change over time due to selection for larger testis size. Therefore, it is important to periodically review the mean SC of various cattle breeds to provide valid bull selection criteria. Scrotal circumference data were obtained from bulls sold in western Canada from 2008 to 2011 and in Quebec from 2006 to 2010. Average scrotal circumferences for the most common beef breeds in Canada have increased significantly in the last 25 years. Differences between breeds have remained unchanged and Simmental bulls still have the largest SC at 1 year of age. Data provided here could aid in the establishment of new suggested minimum SC measurements for beef bulls.
选择具有适当睾丸大小的肉用公牛是公牛繁殖健全性评估的重要组成部分。阴囊周长（SC）与双侧睾丸重量高度相关，是一种在活体动物中估算睾丸重量的实用方法。在加拿大出售的大多数公牛在售前信息中都包含阴囊周长。阴囊周长因年龄和品种而异，并且由于选择更大的睾丸大小，其可能随时间变化。因此，定期审查各种牛品种的平均阴囊周长以提供有效的公牛选择标准非常重要。阴囊周长数据来自2008年至2011年在加拿大西部以及2006年至2010年在魁北克出售的公牛。在过去25年中，加拿大最常见的肉用品种的平均阴囊周长显著增加。品种之间的差异保持不变，西门塔尔公牛在1岁时的阴囊周长仍然最大。此处提供的数据有助于确定肉用公牛新的建议最小阴囊周长测量值。
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