Stubbings L A, Maund B A
Vet Rec. 1988 Nov 5;123(19):489-92. doi: 10.1136/vr.123.19.489.
Fecundin, which actively immunises sheep against androstenedione, has now been commercially available to British farmers for three seasons. By its use an average increase of 20 to 25 per cent in the number of lambs reared can be expected, although the results on individual farms have been variable. During 1984-85 and 1985-86 ADAS carried out trials involving over 2000 ewes on 13 commercial farms. The responses to the treatment were statistically significant in both years (+23 per cent in 1984-85 and +27 per cent in 1985-86). However, the ranges in response were from -2 per cent to +49 per cent and +9 per cent to +42 per cent in 1984-85 and 1985-86, respectively. Similar results have been reported by other workers and commercial farmers using the technique. From these data it is clear that there are interactions between the treatment and animal factors including breed, body condition, nutrition, season and management. These factors are discussed with regard to the implications for the use of the product in commercial flocks.
“孕力素”能使绵羊主动免疫雄烯二酮，目前已在英国农场商业化销售三个季节了。使用该药有望使饲养的羔羊数量平均增加20%至25%，不过各个农场的效果有所不同。1984 - 1985年和1985 - 1986年期间，农业发展与咨询服务处（ADAS）在13个商业农场对2000多只母羊进行了试验。两年的试验结果在统计学上均具有显著意义（1984 - 1985年增加23%，1985 - 1986年增加27%）。然而，1984 - 1985年和1985 - 1986年的反应范围分别为 - 2%至 + 49%和 + 9%至 + 42%。其他研究人员和使用该技术的商业农场主也报告了类似结果。从这些数据可以清楚地看出，该治疗方法与动物因素（包括品种、身体状况、营养、季节和管理）之间存在相互作用。本文将讨论这些因素对该产品在商业羊群中使用的影响。
