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Use of a partial least-squares regression model to predict test day of milk, fat and protein yields in dairy goats

Published online by Cambridge University Press:  09 March 2007

N.P.P. Macciotta ,
C. Dimauro ,
N. Bacciu ,
P. Fresi  and
A. Cappio-Borlino
N.P.P. Macciotta*
Affiliation:
Dipartimento di Scienze Zootecniche, Universita di Sassari, Via De Nicola 9, 07100 Sassaru, Italy
C. Dimauro
Affiliation:
Dipartimento di Scienze Zootecniche, Universita di Sassari, Via De Nicola 9, 07100 Sassaru, Italy
N. Bacciu
Affiliation:
Dipartimento di Scienze Zootecniche, Universita di Sassari, Via De Nicola 9, 07100 Sassaru, Italy
P. Fresi
Affiliation:
Associazione Nazionale della Pastorizia, Via Togliatti 1587, 00155, Rome, Italy
A. Cappio-Borlino
Affiliation:
Dipartimento di Scienze Zootecniche, Universita di Sassari, Via De Nicola 9, 07100 Sassaru, Italy
*
† E-mail: wolf@tzv.fal.de
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Abstract

A model able to predict missing test day data for milk, fat and protein yields on the basis of few recorded tests was proposed, based on the partial least squares (PLS) regression technique, a multivariate method that is able to solve problems related to high collinearity among predictors. A data set of 1731 lactations of Sarda breed dairy Goats was split into two data sets, one for model estimation and the other for the evaluation of PLS prediction capability. Eight scenarios of simplified recording schemes for fat and protein yields were simulated. Correlations among predicted and observed test day yields were quite high (from 0·50 to 0·88 and from 0·53 to 0·96 for fat and protein yields, respectively, in the different scenarios). Results highlight great flexibility and accuracy of this multivariate technique.

Keywords

goatsmilk fatmilk proteinpredictionregression analysis
Type
Research Article
Information
Animal Science , Volume 82 , Issue 4 , August 2006 , pp. 463 - 468
Copyright
Copyright © British Society of Animal Science 2006

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