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Relationship between lactation curve function and phenotypic variance in random regression Test Day models

Macciotta, Nicolò Pietro Paolo and Vicario, Daniele and Cappio Borlino, Aldo (2005) Relationship between lactation curve function and phenotypic variance in random regression Test Day models. Italian Journal of Animal Science, Vol. 4 (Suppl. 2), p. 19-21. eISSN 1828-051X. Article.

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Abstract

In Random Regression models (RRM), the most updated version of Test Day (TD) models, the lactation curve is split into a fixed average curve and a random animal specific part (deviation from the average curve) (Schaeffer, 2004). The variance component of the RR coefficients determines the (co) variance function of each pair of days in milk (DIM) (Pool and Meuwissen, 2000). Very different patterns of variance functions have been reported in literature, and several authors pointed out a possible rule of the type of function chosen as RR sub-model and data structure (Kettunen et al., 2000; Meyer, 1998). Aim of this work is to investigate some possible reasons for such results, in particular the effects of the mathematical function and of the possible occurrence of different shapes of lactation curve (regular and atypical).

Item Type:Article
ID Code:978
Status:Published
Refereed:Yes
Uncontrolled Keywords:Phenotypic variance, random regression models, lactation curve
Subjects:Area 07 - Scienze agrarie e veterinarie > AGR/17 Zootecnica generale e miglioramento genetico
Divisions:001 Università di Sassari > 01 Dipartimenti > Scienze zootecniche
Publisher:Avenue media on behalf of Scientific Association of Animal Production (ASPA)
eISSN:1828-051X
Publisher Policy:Depositato per gentile concessione dell'ASPA
Additional Information:Relazione al 16. Congresso nazionale ASPA, Torino, 28-30 giugno 2005.
Deposited On:18 Aug 2009 10:03

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