ORIGINAL PAPER
Modeling lactation curves of Polish Holstein-Friesian cows. Part I: The accuracy of five lactation curve models
A. Otwinowska-Mindur 1  
,   E. Ptak 1,   W. Jagusiak 1,   A. Satoła 1
 
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University of Agriculture in Krakow, Department of Genetics and Animal Breeding, al. Mickiewicza 24/28, 30-059 Kraków, Poland
CORRESPONDING AUTHOR
A. Otwinowska-Mindur   

University of Agriculture in Krakow, Department of Genetics and Animal Breeding, al. Mickiewicza 24/28, 30-059 Kraków, Poland
Publication date: 2013-02-18
 
J. Anim. Feed Sci. 2013;22(1):19–25
 
KEYWORDS
ABSTRACT
The objective of this study was to compare five mathematical functions used for modeling lactation curves and to choose the most suitable one for Polish Holstein-Friesian cows. The data used were 1,944,818; 1,548,700; and 1,081,107 test-day milk yields from 220,487 first, 181,165 second, and 128,774 third lactations. Five models were fitted to the test-day data: the Ali and Schaeffer (ALI), Guo (GUO), and Wilmink (WIL) functions, and thirdorder (LEG3), and fourth-order (LEG4) Legendre polynomials. The milk lactation curves were fitted using a multiple-trait prediction method. Several criteria based on the analysis of residuals were used to compare the models. Of the five models, five-parameter functions (ALI and LEG4) gave the best goodness of fit for standard lactations (305-d), whereas three-parameter functions (GUO and WIL) were the worst. For extended lactations (400-d), the ALI function ensured the most correct prediction.
 
CITATIONS (2):
1.
Comparison of Five Different Lactation Curve Models to Estimate Milk Yield of Friesian Holstein Cows at BBPTU HPT Baturraden
E Nanda, L Salman, H Indrijani, D Tasripin, A Anang
IOP Conference Series: Earth and Environmental Science
 
2.
Modelling Extended Lactations in Polish Holstein–Friesian Cows
Agnieszka Otwinowska-Mindur, Ewa Ptak, Joanna Makulska, Olga Jarnecka
Animals
 
ISSN:1230-1388