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Algebraic models of the lactation curve in Sahiwal, Frieswal and other grades of Friesian cattle*

Indian Agricultural Research Journals

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Title Algebraic models of the lactation curve in Sahiwal, Frieswal and other grades of Friesian cattle*
 
Creator SINGH, DEVENDRA
SINGH, BALBIR
VINAYAK, A K
YADAV, A S
KUMAR, SANJEEV
KUMAR, K G
 
Subject Algebraic models, Cattle, Frieswal, Lactation, Inverse polynomial, Gamma type function
 
Description Comparative efficiency of inverse polynomial and gamma type algebraic models of the lactation curve were studied to estimate milk production trends during a lactation on 487 records ofSahiwal, Frieswal and other grades of Friesian cattle extending over 14 years (1980-1993). Principles of least squares analysis were used to solve the equations. The slope of ascending phase was steeper than the descending phase indicating high rate of increase in milk yield in ascending phase in all the genetic groups. The inverse polynomial and gamma type models estimated an initial ascending phase followed by a peak and then a descending phase with the advancement of the lactation. The inverse polynomial was marginally superior to gamma type and considered as model of choice for individual lactation curve (R2>98%) in all the genetic groups. The gamma type function estimated the lactation curves most efficiently in Sahiwal and crossbred.
 
Publisher Directorate of Knowledge Management in Agriculture
 
Contributor —
 
Date 2014-02-18
 
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/37633
 
Source The Indian Journal of Animal Sciences; Vol 72, No 6 (2002)
0367-8318
 
Language eng
 
Relation http://epubs.icar.org.in/ejournal/index.php/IJAnS/article/view/37633/16867
 
Rights Copyright (c) 2014 The Indian Journal of Animal Sciences