@conference {40723,
	title = {Some effects of using progesterone and oestradiol benzoate to stimulate oestrus and ovulation in dairy cows with anovulatory anoestrus},
	booktitle = {Proceedings of the New Zealand Society of Animal Production},
	volume = {55},
	year = {1995},
	month = {Jan},
	pages = {239-241},
	publisher = {New Zealand Society of Animal Production},
	organization = {New Zealand Society of Animal Production},
	abstract = {Anovulatory anoestrus (AA) is a major form of infertility in pasture-  fed dairy cows in New Zealand and is most frequently treated by injecting  equine chorionic gonadotrophin (eCF) after pre-treatment with progesterone  (P4). The effectiveness of this treatment varies between herds. Injecting  oestradiol benzoate (ODB) from 24 h to 48 h following PA4 and ODB  priming can also induce oestrus and ovulation in AA cows. Two field trials  compared responses in 572 cows with AA treated with P4 alone, P4 + eCG  and P4 + ODB. The P4 was administered per vaginum for 5 or 7 days using  a CIDR device.   An injection of 1 mg ODB at 48 h after device removal in Trial 1 increased  the insemination submission rate during the following 4 days from 55\%  among cows treated with P4, or P4 + eCG to 75\%, and reduced the incidence  of non-responding cows from 21\% to 3\%. In Trial 2, the comparable results  to ODB treatments were 86\% inseminated and 3\% not responding.   The increased submission rates were not due to the ODB producing oestrus  without ovulation. Consequently, 42\% of anoestrous cows treated with ODB  conceived during the first week of AB, 75\% conceived after 6 weeks of AB  and only 5.5\% were finally not pregnant. Comparable figures for herdmates  treated with P4 but not injected with ODB were 29\%, 66\% and 12\%  respectively.   Injecting a low dose of ODB from 24 to 48 h after P4 pre-treatment can be  used to successfully treat AA in dairy cows.  },
	issn = {1176-5283},
	author = {Macmillan KL and Taufa VK and Day AM and McDougall S}
}
