@conference {40865,
	title = {Winter feeding of twinning beef cows},
	booktitle = {Proceedings of the New Zealand Society of Animal Production},
	volume = {56},
	year = {1996},
	month = {Jan},
	pages = {382-385},
	publisher = {New Zealand Society of Animal Production},
	organization = {New Zealand Society of Animal Production},
	abstract = {A grazing trial was conducted in southern North Island hill country  during 1994, to determine the influence of pasture allowance during winter  on cow/calf performance of 40 twin- (T) and 40 single-calf (S) bearing  Friesian-cross beef cows. Groups of T and S cows were grazed at low (L),  medium (M) and high (H) pasture allowances for the last 4 months of  gestation. Average LW in late autumn was 467 kg, and change up to 4 weeks pre- calving was LS -7.8\%, MS -2.4\%, HS +1.5\%, LT -8.1\%, MT -3.0\%, HT - 3.5\%, suggesting S cows responded to a increased pasture allowance in late  gestation, but T only to M and no further to H. Blood serum bOH  concentration, which was used as a measure of energy status, was not  influenced by allowance treatment, but T (2.2 mmol/l) had higher  concentrations than S (0.9). Twinning cows had a shorter gestation length  than S cows (277 vs 284 d). Twin calves were lighter at birth (30.9 vs 44.2  kg), had lower perinatal survival (73 vs 96\%), and grew more slowly to 4  months of age than single calves (0.76 vs 1.11 kg/d). Our results suggest that },
	issn = {1176-5283},
	author = {Lambert MG and Devantier BP and Betteridge K and McMillan WH and Pugh PA}
}
