Modeling lactation curves of Polish Holstein-Friesian cows. Part I: The accuracy of five lactation curve models

Agnieszka Otwinowska-Mindur , Ewa Ptak , Wojciech Jagusiak , Alicja Satoła

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.
Author Agnieszka Otwinowska-Mindur (DoAS / DoGaAIM)
Agnieszka Otwinowska-Mindur,,
- Department of Genetics and Animal Improvement Methods
, Ewa Ptak (DoAS / DoGaAIM)
Ewa Ptak,,
- Department of Genetics and Animal Improvement Methods
, Wojciech Jagusiak (DoAS / DoGaAIM)
Wojciech Jagusiak,,
- Department of Genetics and Animal Improvement Methods
, Alicja Satoła (DoAS / DoGaAIM)
Alicja Satoła,,
- Department of Genetics and Animal Improvement Methods
Journal seriesJournal of Animal and Feed Sciences, ISSN 1230-1388, (A 20 pkt)
Issue year2013
Vol22
No1
Pages19-25
Publication size in sheets0.5
Keywords in Englishdairy cow, lactation curve, multiple-trait prediction method, goodness of fit
ASJC Classification1103 Animal Science and Zoology; 1106 Food Science
URL http://www.jafs.com.pl/Modeling-lactation-curves-of-Polish-Holstein-Friesian-cows-Part-I-The-accuracy-of-five-lactation-curve-models,66012,0,2.html
Internal identifierWHiBZ/2013/53
Languageen angielski
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Modeling lactation curves of Polish Holstein-Friesian cows. Part I: The accuracy of five lactation curve models 455,29 KB
Score (nominal)20
Score sourcejournalList
Publication indicators WoS Citations = 4; Scopus SNIP (Source Normalised Impact per Paper): 2014 = 0.681; WoS Impact Factor: 2013 = 0.591 (2) - 2013=0.639 (5)
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