@conference {40854,
	title = {Varying the form of oestradiol administration in anoestrous cows previously treated with progesterone},
	booktitle = {Proceedings of the New Zealand Society of Animal Production},
	volume = {56},
	year = {1996},
	month = {Jan},
	pages = {350-352},
	publisher = {New Zealand Society of Animal Production},
	organization = {New Zealand Society of Animal Production},
	abstract = {The hypothesis tested in this field trial was that 1 mg oestradiol  benzoate (ODB) could be equally effective where administered to  anoestrous animals either by intramuscular injection or in a gelatin capsule  per vaginum. The ODB treatment was administered to 412 cows in 8 dairy  herds 24 h after the end of a 6-day priming treatment with progesterone, also  administered per vaginum. By 48 h after ODB administration, 87\% of injected animals had been  detected in oestrus and inseminated compared to only 44\% of herdmates  receiving the gelatin capsule (P<0.01). Re-examination of those animals not  detected in oestrus by 13 days after ODB treatment showed that 30\% of  capsule-treated animals were still anoestrus and another 10\% had ovulated  without being detected in oestrus. Comparable percentages for the injected  animals were 3\% and 2\% respectively (P<0.01). The vaginal treatment was  also associated with a reduced pregnancy rate to first insemination (31.7\%  vs 47.7\%; P<0.05). The reduced efficacy associated with the vaginal administration of ODB to  anoestrous animals most probably involved a prolonged rate of absorption  which did not stimulate behavioural oestrus or an ovulatory surge of LH but  did reduce fertility in those animals which were inseminated.},
	issn = {1176-5283},
	author = {Macmillan KL and Taufa VK and Day AM}
}
