Article (Scientific journals)
Genetic variability of the mid-infrared prediction of lactoferrin content in milk for Walloon Holstein first-parity cows
Leclercq, Gil; Gengler, Nicolas; Soyeurt, Hélène et al.
2013In Livestock Science, 151 (2-3), p. 158-162
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Keywords :
Bovine milk; Genetic variability; Mid-infrared prediction; Lactoferrin
Abstract :
[en] The objective of this study was to assess the genetic variability of the mid-infrared prediction of lactoferrin content in milk (pLF) in Holstein first-parity cows. Variance components were estimated by Average Information Restricted Maximum Likelihood using a single-trait test-day random regression animal model. The dataset included 395,287 test-day records from 67,178 cows in 1190 herds from the Walloon Region of Belgium. Average pLF was 164.89. mg/L and the standard deviation was 76.07. mg/L. Frequency distribution for pLF was slightly asymmetrical, and pLF seemed to increase almost linearly all along the first lactation after a sharp decrease in early lactation. Genetic variance of pLF increased with days in milk within lactation while the permanent environmental variance was the highest in early lactation, then decreased to become lower than genetic variance at 50 days in milk, and finally increased in the last lactation stages. The pLF was a moderately heritable trait. Daily heritability of pLF was the lowest at 5 days in milk (0.19), then increased to reach a maximum at 260 days in milk (0.44), and finally decreased for the last stages of lactation (0.35 at 365 days in milk). Results from this study indicated that pLF is variable and heritable over the lactation and therefore it could be changed by genetic selection. © 2012 Elsevier B.V.
Disciplines :
Genetics & genetic processes
Animal production & animal husbandry
Author, co-author :
Leclercq, Gil ;  Université de Liège - ULiège > Sciences agronomiques > Entomologie fonctionnelle et évolutive
Gengler, Nicolas  ;  Université de Liège - ULiège > Sciences agronomiques > Zootechnie
Soyeurt, Hélène  ;  Université de Liège - ULiège > Sciences agronomiques > Zootechnie
Bastin, Catherine ;  Université de Liège - ULiège > Sciences agronomiques > Zootechnie
Language :
English
Title :
Genetic variability of the mid-infrared prediction of lactoferrin content in milk for Walloon Holstein first-parity cows
Publication date :
2013
Journal title :
Livestock Science
ISSN :
1871-1413
eISSN :
1878-0490
Publisher :
Elsevier Science, Amsterdam, Netherlands
Volume :
151
Issue :
2-3
Pages :
158-162
Peer reviewed :
Peer Reviewed verified by ORBi
European Projects :
FP7 - 211708 - ROBUSTMILK - Innovative and Practical Breeding Tools for Improved Dairy Products from More Robust Dairy Cattle
Funders :
CE - Commission Européenne [BE]
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since 17 March 2013

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