Genetic background in partitioning of metabolizable energy efficiency in dairy cows

Journal of Dairy Science
T MehtiöM H Lidauer

Abstract

The main objective of this study was to assess the genetic differences in metabolizable energy efficiency and efficiency in partitioning metabolizable energy in different pathways: maintenance, milk production, and growth in primiparous dairy cows. Repeatability models for residual energy intake (REI) and metabolizable energy intake (MEI) were compared and the genetic and permanent environmental variations in MEI were partitioned into its energy sinks using random regression models. We proposed 2 new feed efficiency traits: metabolizable energy efficiency (MEE), which is formed by modeling MEI fitting regressions on energy sinks [metabolic body weight (BW0.75), energy-corrected milk, body weight gain, and body weight loss] directly; and partial MEE (pMEE), where the model for MEE is extended with regressions on energy sinks nested within additive genetic and permanent environmental effects. The data used were collected from Luke's experimental farms Rehtijärvi and Minkiö between 1998 and 2014. There were altogether 12,350 weekly MEI records on 495 primiparous Nordic Red dairy cows from wk 2 to 40 of lactation. Heritability estimates for REI and MEE were moderate, 0.33 and 0.26, respectively. The estimate of the residual varianc...Continue Reading

References

Aug 1, 1990·Journal of Experimental Child Psychology·M Bruck, R Treiman
Oct 3, 2009·FASEB Journal : Official Publication of the Federation of American Societies for Experimental Biology· Luke
Oct 17, 2013·Animal : an International Journal of Animal Bioscience·J E PryceB J Hayes
Aug 10, 2015·Journal of Dairy Science·P Mäntysaari, E A Mäntysaari

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