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Estimation of lactation curve parameters for Iranian Holstein dairy cows using non-linear models

Published online by Cambridge University Press:  20 November 2017

H. Farhangfar ,
P. Rowlinson  and
M.B. Willis
H. Farhangfar
Affiliation:
Agriculture Department, Faculty of Agriculture and Biological Sciences, University of Newcastle upon Tyne, NE1 7RU, U.K.
P. Rowlinson
Affiliation:
Agriculture Department, Faculty of Agriculture and Biological Sciences, University of Newcastle upon Tyne, NE1 7RU, U.K.
M.B. Willis
Affiliation:
Agriculture Department, Faculty of Agriculture and Biological Sciences, University of Newcastle upon Tyne, NE1 7RU, U.K.
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Extract

In dairy cattle breeding programmes the knowledge of cow's lactation curve could be an effective tool to make selection decisions. In order to obtain an accurate shape of lactation curve a variety of mathematical models have been used in which parameters of production peak, inclining and declining phases of milk production over the course of lactation have been estimated by linear or non-linear techniques. The main purpose of this research was to compare four non-linear functions for the estimation of first lactation curve of Iranian Holstein dairy cows.

Type
Poster Presentations
Information
Proceedings of the British Society of Animal Science , Volume 2000 , 2000 , pp. 109
Copyright
Copyright © The British Society of Animal Science 2000

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References

Olori, V.E., Brotherstone, S., Hill, W.G. and McGuirk, B. 1999. Fit of Standard models of the lactation curve to weekly records of milk production of cows in a single herd. Livestock Production Science 58: 55–63.Google Scholar
Draper, N.R. and Smith, H. 1998. Applied regression analysis, 3rd Ed., John Wiley and Sons, New York.Google Scholar