@conference {40347,
	title = {A modelling study of once-bred heifer beef production},
	booktitle = {Proceedings of the New Zealand Society of Animal Production},
	volume = {51},
	year = {1991},
	month = {Jan},
	pages = {389-394},
	publisher = {New Zealand Society of Animal Production},
	organization = {New Zealand Society of Animal Production},
	abstract = {Sixteen cows were randomly allocated tot he two treatment  groups; one was given high digestibility hay (57\% DMD and the other low  digestibility hay (52\% DMD). Hay was available to appetite during the  daytime, while the cows grazed on a common pasture allowance (12 kg DM  per cow) at night.   Cows offered high digestibility hay ate more hay (P<0.01) but less  pasture (P<0.05) than those on the low digestibility hay. Pasture  intake was reduced by 0.2kg DM for each increase of 1 kg DM eaten as  high digestibility hay.   Cows offered the high digestibility hay ate more hay (P<0.01) but less  pasture (P<0.05) than those on the low digestibility hay. Pasture  intake was reduced by 0.2 kg DM for each increase of 1 kg DM eaten as  high digestibility hay.   Cows offered the high digestibility hay produced slightly more milk than  those on the low digestibility hay. This difference average 1.3 L per  cow daily, but was significant only in week 1. The composition of milk  did not differ between the two groups. The cows offered the high  digestibility hay also gained significantly more liveweight.   The data show that the quality of supplementary hay has an effect on  milk production, but that the effect is smaller than might have been  predicted because of the increased substitution of hay eaten instead of  pasture by cows given the higher quality hay and because of increased  liveweight gain by these cows. The probable economic value of high  digestibility supplement is discussed briefly.  },
	issn = {1176-5283},
	author = {Keeling PCB and Morris ST and Gray DI and Parker WJ}
}
