Godfrey R W, Lunstra D D
U. S. Department of Agriculture, Clay Center, NE 68933.
J Anim Sci. 1989 Nov;67(11):2897-903. doi: 10.2527/jas1989.67112897x.
A study was conducted to determine the effect of serving capacity (SC) on sexual behavior of yearling bulls during single- and double-sire pasture matings. Approximately 60 crossbred virgin bulls were subjected to 3 SC tests, and 20 bulls were selected that were similar in age, BW, testes size and semen quality. Ten bulls were high SC (greater than or equal to 3 services/test) and 10 bulls were low SC (less than or equal to 2 services/test). Competitive order among the 20 bulls also was determined. Single-sire tests were conducted with 15 intact estrual heifers and 1 bull in a pasture for 6 h. Double-sire tests were conducted with 30 estrus-induced, ovariectomized heifers and 1 high SC and 1 low SC bull of approximately equal competitive order for 6 h. Bulls in double-sire tests had more (P less than .007) mounts than those in single-sire tests. High SC bulls in double-sire tests served more heifers (P less than .04) and had more services (P less than .04) than any other SC group and test type. There was no difference (P greater than .10) in the number of mounts or services between high and low SC bulls in single-sire tests. High SC bulls had a greater (P less than .002) percentage of mounts that culminated in a service that did low SC bulls. Conception rate was not different (P greater than .10) between SC groups in single-sire tests.(ABSTRACT TRUNCATED AT 250 WORDS)
开展了一项研究，以确定配种能力（SC）对周岁公牛在单公牛和双公牛牧场配种期间性行为的影响。约60头杂交处男公牛接受了3次配种能力测试，从中挑选出20头年龄、体重、睾丸大小和精液质量相似的公牛。10头公牛配种能力高（每次测试大于或等于3次配种），10头公牛配种能力低（每次测试小于或等于2次配种）。还确定了这20头公牛之间的竞争顺序。单公牛测试在牧场上让15头处于发情期的未阉割小母牛和1头公牛共处6小时。双公牛测试让30头经诱导发情的去势小母牛与1头配种能力高和1头配种能力低且竞争顺序大致相同的公牛共处6小时。双公牛测试中的公牛比单公牛测试中的公牛有更多（P<0.007）爬跨行为。双公牛测试中配种能力高的公牛比其他任何配种能力组和测试类型的公牛配种的小母牛更多（P<0.04）且配种次数更多（P<0.04）。在单公牛测试中，配种能力高和低的公牛之间的爬跨或配种次数没有差异（P>0.10）。配种能力高的公牛最终完成配种的爬跨百分比高于配种能力低的公牛（P<0.002）。在单公牛测试中，配种能力组之间的受孕率没有差异（P>0.10）。（摘要截选至250字）
