@conference {40314,
	title = {Lactation in transgenic mice expressing the ovine Beta-lactoglobulin gene},
	booktitle = {Proceedings of the New Zealand Society of Animal Production},
	volume = {51},
	year = {1991},
	month = {Jan},
	pages = {225-226},
	publisher = {New Zealand Society of Animal Production},
	organization = {New Zealand Society of Animal Production},
	abstract = {The efficiency of winter feed use for weaner calf production was  compared in a yearling heifer mating system compared to a 2 year old  first mating system in traditional and dairy x beef cows. These  computer modelling analyses illustrated, with yearling heifer mating  compared to 2 year old first mating, that the total weight of calf  weaned per unit of winter feed required is increased by only 2\% (Angus  dams) and 6\% (Hereford x Friesian dams, HxF). With HxF dams compared to  Angus dams, the total weight of calf weaned per unit of winter feed  required was increased by 8\% (2 year old first mating) and 13\% (yearling  heifer mating).   Yearling heifer mating rather than 2 year old first mating within a  traditional beef cow breed is questioned, when compared at the same  winter feed requirement. The superiority of dairy x beef breeding cows  on the basis of calf production from winter feed is confirmed by this  analysis.  Furthermore, this superiority is maximum when yearling  heifer mating is also adopted.  },
	issn = {1176-5283},
	author = {Wilde CJ and Clark AJ and Kerr M and Knight CH and McClenaghan M and Simons JP}
}
