Abstract

The heritability estimation of the shape of the lactation curve is quite complex. However, it now seems to be resolvable thanks to a combination of two mathematical methods which up to now have been developed indipendently. One method is a multitrait analysis of variance components which enables us to estimate the genetic components of phenotypic variance and the trait correlation. The other method is the mathematical modelling of biological phenomena which, when applicable, provides a mathematical description of the relationship between the fundamental quantities under consideration. Multitrait analysis, when applied to lactation curve parameters, enables us to estimate not only the heritability but also the genetic and phenotipic correlations of the essential elements of the lactation curve.

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