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Analysis of feed intake and energy balance of high-yielding first lactating Holstein cows with fixed and random regression models

Published online by Cambridge University Press:  16 October 2008

H. Hüttmann ,
E. Stamer ,
W. Junge ,
G. Thaller  and
E. Kalm
H. Hüttmann
Affiliation:
Institute of Animal Breeding and Husbandry, Christian-Albrechts-University, 24098 Kiel, Germany
E. Stamer
Affiliation:
TiDa Tier und Daten GmbH, 24259 Westensee/Brux, Germany
W. Junge*
Affiliation:
Institute of Animal Breeding and Husbandry, Christian-Albrechts-University, 24098 Kiel, Germany
G. Thaller
Affiliation:
Institute of Animal Breeding and Husbandry, Christian-Albrechts-University, 24098 Kiel, Germany
E. Kalm
Affiliation:
Institute of Animal Breeding and Husbandry, Christian-Albrechts-University, 24098 Kiel, Germany
*
E-mail: wjunge@tierzucht.uni-kiel.de
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Abstract

At the dairy research farm Karkendamm, the individual roughage intake was measured since 1 September 2005 using a computerised scale system to estimate daily energy balances as the difference between energy intake and calculated energy requirements for lactation and maintenance. Data of 289 heifers with observations between the 11th and 180th day of lactation over a period of 487 days were analysed. Average energy-corrected milk yield, feed intake, live weight and energy balance were 31.8kg, 20.6kg, 584 kg and 13.6 MJ NEL (net energy lactation), respectively, per day. Fixed and random regression models were used to estimate repeatabilities, correlations between cow effects and genetic parameters. The resulting genetic correlations in different lactation stages demonstrate that feed intake and energy balance at the beginning and the middle of lactation are genetically different traits. Heritability of feed intake is low with h2=0.06 during the first days after parturition and increases in the middle of lactation, whereas the energy balance shows the highest heritability with h2=0.34 in the first 30 days of lactation. Genetic correlations between energy balance and feed intake and milk yield, respectively, illustrate that energy balance depends more on feed intake than on milk yield. Genetic correlation between body condition score and energy balance decreases rapidly within the first 100 days of lactation. Hence, to avoid negative effects on health and reproduction as consequences of strong energy deficits at the beginning of lactation, the energy balance itself should be measured and used as a selection criterion in this lactation stage. Since the number of animals is rather small for a genetic analysis, the genetic parameters have to be evaluated on a more comprehensive dataset.

Keywords

dairy cowsenergy balancefeed intakerandom regression
Type
Full Paper
Information
animal , Volume 3 , Issue 2 , February 2009 , pp. 181 - 188
Copyright
Copyright © The Animal Consortium 2008

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