@conference {40358,
	title = {Factors affecting beef finishing efficiency on pasture},
	booktitle = {Proceedings of the New Zealand Society of Animal Production},
	volume = {51},
	year = {1991},
	month = {Jan},
	pages = {453-458},
	publisher = {New Zealand Society of Animal Production},
	organization = {New Zealand Society of Animal Production},
	abstract = {Nineteen cows, diagnosed 30 to 50 days after insemination as  conceiving to a double ovulation and ranging in age from 2 to 8 years,  were compared for possible signs of pregnancy toxaemia with a sample  group of 18 single-ovulating single-pregnant controls, balanced for age.  Blood samples were obtained on four occasions, between 2 and 10 weeks  before the date when the first cow was due to calve. Blood samples were  analysed for ferroxidase, albumin (A), globulin, total protein, the  ratio of albumin to globulin, magnesium, beta-hydroxybutyrate (BOH),  gamma-glutamyltransferase and serum or whole blood selenium (Se). There  were significant differences between single-pregnant and twin-pregnant  cows in the concentrations of A, BOH and whole blood Se. Least-squares  means were as follows: A, 33.7 and 32.3 g/l; BOH, 0.46 and 1.62 mmol/l;  and whole blood Se 887 and 737 nmol/l. The BOH data in particular were  useful in identifying cows possible requiring extra veterinary  supervision.  },
	issn = {1176-5283},
	author = {McCall DG and Marshall PR}
}
