@conference {40394,
	title = {A terminal sire breeding programme based on screening for hogget liveweight},
	booktitle = {Proceedings of the New Zealand Society of Animal Production},
	volume = {52},
	year = {1992},
	month = {Jan},
	pages = {125-128},
	publisher = {New Zealand Society of Animal Production},
	organization = {New Zealand Society of Animal Production},
	abstract = {Eighty mature fallow deer does were allocated to four treatment  groups (n+20) for which oestrous synchronization treatment consisted of  intravaginal insertion of single CIDR devices for 14 days and  prostaglandin administration on days 0 and 10 of device insertion.  Treatment groups were staggered successively by 7-day intervals from  early March to late May, the period spanning the natural mating season  (rut). Observations to determine the onset of oestrus were performed  24-72 hours after CIDR device withdrawal and blood samples were  collected four times during insertion and then every 2 days, for 14  days, from CIDR device withdrawal. Plasma samples were analysed for  progesterone concentration to determine luteal development. A group of  untreated contemporary control does were allowed to mate naturally to  crayon-harnessed bucks to determine the period of the 1990 natural rut.  Oestrus and ovulation were detected on 69\% and 80\% of occasions  respectively following CIDR device withdrawal, with ovulation following  oestrus on 98\% of occasions. Ovulation not preceded by observed  oestrus, probably representing silent ovulations, occurred early in the  breeding season. There was complete failure of response, in terms of  does exhibiting oestrus increased from 0-10\% to 89-100\% with the  greatest coinciding with the onset of the natural rut. In addition, the  mean interval from CIDR device withdrawal to onset of oestrus tended to  decrease from between 71-88h to 47-63h and oestrous synchrony improved  progressively during the trial. The efficacy of CIDR devices in  synchronizing oestrus and ovulation in fallow deer does is clearly  influenced by timing of treatment relative to the natural breeding  season of the herd.  },
	issn = {1176-5283},
	author = {Nicoll GB and Alderton MJ and Annandale DD and Coleman ID and Grimwood TJ and Thomson JA}
}
