White A J, Dobson H
Department of Veterinary Clinical Science, University of Liverpool, Leahurst, Neston, South Wirral.
Vet Rec. 1990 Dec 15;127(24):588-92.
Three hundred and thirty-one dairy cows in six herds were used to study the effect of a single injection of 25 mg dinoprost, a prostaglandin F2 alpha derivative, administered eight days after calving on several indices of fertility. A detailed comparison was made between 113 treated cows and 113 control cows of the same parity, which had calved within seven days of each other on the same farm and had experienced the same degree of dystocia. In cows which had calved without assistance, the treatment reduced the mean interval between calving and first heat from 40 days to 37 days but increased the mean interval between calving and conception from 83 days to 85 days. In cows which had required assistance at calving, the treatment reduced the mean interval between calving and first heat from 44 days to 34 days and reduced the mean calving to conception interval from 86 days to 68 days. The cows which benefited most were those which had required assistance during their second, third or fourth calvings; their calving to conception intervals were shortened by 22.5 days. An average of 1.39 services was required to establish conception in the treated cows which calved unaided, with 70 per cent conceiving to the first service, compared with an average of 1.34 services per conception and a 72 per cent conception rate to first service for their untreated herdmates.(ABSTRACT TRUNCATED AT 250 WORDS)
选取六个牛群中的331头奶牛，研究产后八天单次注射25毫克地诺前列素（一种前列腺素F2α衍生物）对多项繁殖指标的影响。对113头接受治疗的奶牛和113头相同胎次的对照奶牛进行了详细比较，这些对照奶牛在同一农场彼此间隔七天内产犊，且难产程度相同。在无需助产的奶牛中，治疗使产犊至首次发情的平均间隔从40天缩短至37天，但使产犊至受孕的平均间隔从83天增加至85天。在产犊时需要助产的奶牛中，治疗使产犊至首次发情的平均间隔从44天缩短至34天，并使产犊至受孕的平均间隔从86天缩短至68天。受益最大的奶牛是那些在第二、第三或第四次产犊时需要助产的奶牛；它们的产犊至受孕间隔缩短了22.5天。在无需助产的经治疗奶牛中，平均需要1.39次配种才能受孕，其中70%的奶牛第一次配种即受孕，而未治疗的同群奶牛受孕平均每次需要1.34次配种，第一次配种的受孕率为72%。（摘要截选至250词）
