Hopkins F M, Spitzer J C
Department of Large Animal Clinical Science, University of Tennessee, Knoxville, USA.
Vet Clin North Am Food Anim Pract. 1997 Jul;13(2):283-93. doi: 10.1016/s0749-0720(15)30341-8.
In 1993, The Society for Theriogenology published revised standards for breeding soundness evaluation of bulls. These revised standards replaced the old semen score format with minimum acceptable scores for scrotal circumference (varies with age), motility (30% or fair), and morphology (70%).
1993年，繁殖兽医学学会发布了种公牛繁殖健全性评估的修订标准。这些修订标准取代了旧的精液评分格式，采用了阴囊周长（随年龄而异）、活力（30%或良好）和形态（70%）的最低可接受分数。
