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An extension of Wood's model to describe the lactation performance of dairy animals

Indian Agricultural Research Journals

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Title An extension of Wood's model to describe the lactation performance of dairy animals
 
Creator PRASAD, SHIV
SINGH, RAM KARAN
SINGH, RAJENDRA
 
Subject Error, Goodness - of-fit, Lactation curve model, Lactation performance, Peak period, Peak yield
 
Description A new lactati on model Y1 = A tbe- tct + d) which is an extension of Wood's model (Y1 = A tb e-ct) is proposed. The curve has its muximun at rime t = {b+∑-{b2 + 4cd)}/2c. Wood's model, Morant and Gnanasakthy model, Mitscherlich x Exponential model and proposed model were fitted to the average weekly milk yields of crossbred cows. The errors generated by the proposed and Mitscherlich x Exponential models followed first order autocorrelation scheme, whereas, the errors generated by the Morant and Gnanasakthy and Wood models followed second and third order autocorrelation scheme respectively. The proposed and Mitscherlich x Exponential odels showed better performance than the Wood and Morant and Gnanasakthy models in deseribing the lactation curve and provided autocorrelated errors of first order only.
 
Publisher Directorate of Knowledge Management in Agriculture
 
Contributor —
 
Date 2014-03-02
 
Type info:eu-repo/semantics/article
info:eu-repo/semantics/publishedVersion
—
 
Format application/pdf
 
Identifier http://epubs.icar.org.in/ejournal/index.php/IJAnS/article/view/38485
 
Source The Indian Journal of Animal Sciences; Vol 74, No 4 (2004)
0367-8318
 
Language eng
 
Relation http://epubs.icar.org.in/ejournal/index.php/IJAnS/article/view/38485/17305
 
Rights Copyright (c) 2014 The Indian Journal of Animal Sciences