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Post-weaning feed efficiency decreased in progeny of higher milk yielding beef cows

Published online by Cambridge University Press:  10 July 2017

J. T. Mulliniks ,
S. R. Edwards ,
J. D. Hobbs ,
Z. D. McFarlane  and
E. R. Cope
J. T. Mulliniks*
Affiliation:
Department of Animal Science, University of Tennessee, Knoxville, TN 38571, USA
S. R. Edwards
Affiliation:
Department of Animal Science, University of Tennessee, Knoxville, TN 38571, USA
J. D. Hobbs
Affiliation:
Department of Animal Science, University of Tennessee, Knoxville, TN 38571, USA
Z. D. McFarlane
Affiliation:
Department of Animal Science, University of Tennessee, Knoxville, TN 38571, USA
E. R. Cope
Affiliation:
Department of Animal Science, University of Tennessee, Knoxville, TN 38571, USA
*
†E-mail: jmulli@utk.edu
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Abstract

Current trends in the beef industry focus on selecting production traits with the purpose of maximizing calf weaning weight; however, such traits may ultimately decrease overall post-weaning productivity. Therefore, the objective of this study was to evaluate the effects of actual milk yield in mature beef cows on their offspring’s dry matter intake (DMI), BW, average daily gain, feed conversion ratio (FCR) and residual feed intake (RFI) during a ~75-day backgrounding feeding trial. A period of 24-h milk production was measured with a modified weigh-suckle-weigh technique using a milking machine. After milking, cows were retrospectively classified as one of three milk yield groups: Lower (6.57±1.21 kg), Moderate (9.02±0.60 kg) or Higher (11.97±1.46 kg). Calves from Moderate and Higher milk yielding dams had greater (P<0.01) BW from day 0 until day 75 at the end of the backgrounding feeding phase; however, day 75 BW were not different (P=0.36) between Lower and Moderate calves. Body weight gain was greater (P=0.05) for Lower and Moderate calves from the day 0 BW to day 35 BW compared with Higher calves. Overall DMI was lower (P=0.03) in offspring from Lower and Moderate cows compared with their Higher milking counterparts. With the decreased DMI, FCR was lower (P=0.03) from day 0 to day 35 in calves from Lower and Moderate milk yielding dams. In addition, overall FCR was lower (P=0.02) in calves from Lower and Moderate milk yielding dams compared with calves from Higher milk yielding dams. However, calving of Lower milk yielding dams had an increased (P=0.04) efficiency from a negative RFI value compared with calves from Moderate and Higher milking dams. Results from this study suggest that increased milk production in beef cows decreases feed efficiency during a 75-day post-weaning, backgrounding period of progeny.

Keywords

beef cattlefeed efficiencyfeed intakemilk productionpost-weaning growth
Type
Research Article
Information
animal , Volume 12 , Issue 2 , February 2018 , pp. 275 - 279
Copyright
© The Animal Consortium 2017 

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