de Kruif A, Zikken A, Kommerij R, de Bois C H
Tijdschr Diergeneeskd. 1976 Nov 15;101(22):1257-62.
Twenty-five mg. of PGF2 alpha were injected in forty-three lactating cows and eighteen young heifers at ten-day intervals to produce synchronisation of oestrus. Only twenty-four lactating cows (58 per cent) and fifteen young heifers (83 per cent) came on oestrus with two, three or four days after the second injection of prostaglandin. Within eighty hours after the second injection, all animals were inseminated with semen of good quality. This resulted in pregnancy in eight (19 per cent) dairy cows and ten (56 per cent) young heifers. Rectal examination at the time of the second injection revealed a number of changes in the lactating cows. There was undue follicular activity, follicular cysts were observed in several cases and a corpus luteum measuring more than 15 mm. in diameter was not present in 25 per cent of the animals. In addition, twenty-seven cows were synchronised by injection of 0.5 mg. of Estrumate (a synthetic prostaglandin analogue) during the puerperium. Injections were made twenty and thirty days post partum. Eighteen cows (67 per cent) came on oestrus within two, three or four days after the second injection. Insemination which was carried out during oestrus, resulted in pregnancy in five cows. Rectal examination did not reveal any abnormalities in these animals.
对43头泌乳奶牛和18头青年母牛每隔10天注射25毫克前列腺素F2α，以促使发情同步。第二次注射前列腺素后，只有24头泌乳奶牛（58%）和15头青年母牛（83%）在2至4天内发情。第二次注射后80小时内，所有动物均用优质精液输精。这使得8头（19%）奶牛和10头（56%）青年母牛怀孕。第二次注射时的直肠检查发现泌乳奶牛有一些变化。卵泡活动异常，在一些病例中观察到卵泡囊肿，25%的动物未出现直径超过15毫米的黄体。此外，27头奶牛在产褥期注射0.5毫克氯前列醇（一种合成前列腺素类似物）实现了发情同步。在产后20天和30天进行注射。18头奶牛（67%）在第二次注射后2至4天内发情。发情期进行输精，使5头奶牛怀孕。直肠检查未发现这些动物有任何异常。
