@conference {89258,
	title = {Efficiency of beef breeding cows that vary in live weight and milking potential},
	booktitle = {Proceedings of the New Zealand Society of Animal Production},
	volume = {73},
	year = {2013},
	month = {Jan},
	pages = {11-16},
	publisher = {New Zealand Society of Animal Production},
	organization = {New Zealand Society of Animal Production},
	address = {Hamilton},
	abstract = {<p>Size and milking potential of beef breeding cows affect their productivity and efficiency. This experiment compared the productivity and efficiency of straightbred Angus (AA) (high live weight, low-milk potential), Angus-cross-Holstein Friesian (AF) (high live weight, high-milk potential), Angus-crossKiwicross (AK) (moderate live weight, high-milk potential) and Angus-cross-Jersey (AJ) cows (low live weight, high-milk potential). High-milk lines produced heavier calves at weaning than the low-milkproducing AA. AF and AK cows weaned the heaviest calves at 225 {\textpm} 3 kg and 224 {\textpm} 4 kg respectively. These calves were heavier than those weaned by AJcows (212 {\textpm} 3 kg). All of these three genotypes weaned heavier calves than AA cows (197 {\textpm} 3 kg). In turn, all three high-milk lines had greater weaning efficiency ((weaning weight of calf/weight of cow at calf weaning) x100) than AA cows which had an efficiency of 36.7 {\textpm} 0.7\%. AJ and AK cows were the most efficient at 46.7 {\textpm} 0.7\% and 46.0 {\textpm} 1.0\%, respectively. AJ cows were also more efficient than the AF cows (44.0 {\textpm} 0.8\%). Increased milking potential and decreased live weight of breeding cows increased their efficiency of production.</p>
},
	issn = {1176-5283},
	author = {Law NL and Hickson RE and Lopez-Villalobos N and Kenyon PR and Morris ST}
}
