Efficiency of beef breeding cows that vary in live weight and milking potential

TitleEfficiency of beef breeding cows that vary in live weight and milking potential
Publication TypeConference Paper
Year of Publication2013
AuthorsNL, Law, Hickson R E., N Lopez-villalobos, PR Kenyon, and ST Morris
Conference NameProceedings of the New Zealand Society of Animal Production
Date PublishedJan
PublisherNew Zealand Society of Animal Production
Conference LocationHamilton
KeywordsCow efficiency project

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 ± 3 kg and 224 ± 4 kg respectively. These calves were heavier than those weaned by AJcows (212 ± 3 kg). All of these three genotypes weaned heavier calves than AA cows (197 ± 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 ± 0.7%. AJ and AK cows were the most efficient at 46.7 ± 0.7% and 46.0 ± 1.0%, respectively. AJ cows were also more efficient than the AF cows (44.0 ± 0.8%). Increased milking potential and decreased live weight of breeding cows increased their efficiency of production.

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