Comparison of Different Lactation Curve Models to Describe Lactation Curve in Moroccan Holstein-Friesian Dairy Cows

Subject Areas : Camel

I. Boujenane ¹ ( Department of Animal Production and Biotechnology, Institut Agronomique et Veterinaire Hassan II,P.O. Box 6202 Rabat-Instituts, 10101 Rabat, Morocco )

Received: 2013-02-08 Accepted : 2013-04-16 Published : 2013-12-01

Keywords: lactation curve, Morocco, dairy cattle, coefficient of determination, Wood model,

Abstract :

In this study, the incomplete gamma function, an exponential function, a mixed-log function and a polynomial function were evaluated to describe the lactation curve in Moroccan Holstein-Friesian dairy cows. Data from 1990 to 1999, comprising 77130 monthly milk yields of 6029 dairy cows in 280 dairy herds, were used. Edits were carried out by considering the lactation length (5 d and

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