King G J, Burnside E B, Curtis R A
Can Vet J. 1983 Apr;24(4):105-7.
The percentage of dairy cows that were mated and became pregnant during a 42 day breeding period was not significantly different when animals were routinely observed for estrus and mated when detected (71%, n = 56), inseminated at estrus following a single injection of cloprostenol (72%, n = 29), or inseminated at a fixed time after two cloprostenol treatments 11 days apart (69%, n = 28). However, 11 cows in the control group were not detected and mated during the breeding period and inclusion of these animals reduced the actual pregnancy rate to 60%. Results indicated that a controlled breeding program could have practical application in dairy herds but should be used with caution. Practitioners must evaluate management programs and decide, in consultation with the herdsman, if the introduction of controlled breeding technology might be advantageous.
在42天的繁殖期内，通过常规观察发情并在发情被检测到时进行配种的奶牛，其受孕的百分比（71%，n = 56），与单次注射氯前列醇后在发情期进行人工授精的奶牛（72%，n = 29），或在间隔11天进行两次氯前列醇治疗后在固定时间进行人工授精的奶牛（69%，n = 28）相比，并无显著差异。然而，对照组中有11头奶牛在繁殖期内未被检测到且未进行配种，将这些奶牛纳入计算后，实际受孕率降至60%。结果表明，可控繁殖计划在奶牛群中具有实际应用价值，但应谨慎使用。从业者必须评估管理计划，并与牧民协商后决定引入可控繁殖技术是否可能具有优势。
