@conference {40245,
	title = {Animal industries into the 21st century: a wool perspective},
	booktitle = {Proceedings of the New Zealand Society of Animal Production},
	volume = {50},
	year = {1990},
	month = {Jan},
	pages = {387-392},
	publisher = {New Zealand Society of Animal Production},
	organization = {New Zealand Society of Animal Production},
	abstract = {The MAFTech Sire Referencing Scheme is a national programme to   evaluate rams, via progeny testing, throughout New Zealand. Phenotypic   effects are reduced by using "Link sires" to make comparisons between   properties valid. To enable link sires to be used over large numbers of   animals in diverse locations, extensive use is made of Artificial   Insemination (AI).     Data from over 3,000 ewes mated by AI during the 1989 breeding season   are presented. Various factors and their interactions were examined by   fitting a generalised linear model with binomial distribution. The   model showed that: the non-return rate from cervical insemination with   chilled semen was 61\% for ewes which had been treated with CIDRs and 62\%   (SED 3.4) for naturally cycling ewes; for frozen/thawed semen inseminate   by the intrauterine route the corresponding rates were 70\% and 40\%   (SED 7.0). In ewes treated with CIDRs the non-return rate was lower for   cervical compared to intrauterine in semination (61\% vs 70\% SED 4.0).   Ewes which were in oestrus more than 24 hours before insemination had a   non-return rate of 58\% compared to 63\% (SED 2.6) for ewes which were in   oestrus between 24 and 17 hours before AI and 71\% (SED 3.1) when oestrus   occurred less than 17 hours before AI. There was no evidence of an   interaction between inseminated increased. (Coefficient for logit   regression 0.14 se 0.064). Technicians success rate ranged from 51\% to   76\% non returns, when adjusted for other factors. Although differences   among the 31 sires did not contribute significantly to this model,   predicted non-return rates when sire was added to the model ranged from   39\% to 86\%. There was no evidence that ewe breed influenced non-return   rate.    },
	issn = {1176-5283},
	author = {Wiggins LK}
}
