A structural equation model to analyze energy utilization in lactating dairy cows

L.E. Moraes, A.B. Strathe, E. Kebreab, D.P. Casper, J. Dijkstra, J. France, J.G. Fadel

Research output: Chapter in Book/Report/Conference proceedingConference paperAcademicpeer-review

Abstract

Energy balance trials from lactating cows have traditionally been analyzed using the regression approach. However, univariate analysis of mutually interacting animal traits can provide biased parameter estimates if one trait is used as an explanatory variable to model a second trait and the sub-model of the first trait is ignored (Gianola and Sorensen, 2004). Moreover, multivariate methods should be preferred because animal responses are correlated and relationships among responses can be quantified through the use of structural equations. Furthermore, the US current energy evaluation system of dairy cattle (NRC, 2001) relies on energetic parameters from the 1960’s but over the past decades genetic improvement of dairy cattle has substantially increased the ability of cows to produce milk. The objective of the present study was to analyze energy utilization in lactating cows using structural equations.
Original languageEnglish
Title of host publicationProceedings of the 4th International Symposium on Energy and Protein Metabolism and Nutrition, 9-12 September 2013, Sacramento, California, USA
EditorsJ.W. Oltjen, E. Kebreab, H. Lapierre
Place of PublicationWageningen
PublisherWageningen Academic Publishers
Pages327-328
Volume134
ISBN (Print)9789086862276
DOIs
Publication statusPublished - 2013
Event4th International Symposium on Energy and Protein Metabolism and Nutrition, Sacramento, California, USA -
Duration: 9 Sep 201312 Sep 2013

Conference

Conference4th International Symposium on Energy and Protein Metabolism and Nutrition, Sacramento, California, USA
Period9/09/1312/09/13

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