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Journal of Entomology and Zoology Studies
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P-ISSN: 2349-6800, E-ISSN: 2320-7078

Journal of Entomology and Zoology Studies

2019, Vol. 7, Issue 4
Comparison of five different lactation curve models for prediction of monthly test day milk yields and first lacatation milk yield in crossbred cattle of Kerala

Prakash G, Anilkumar K and V Jamuna

A study was undertaken for modeling of best fit lactation curve in crossbred cattle of Kerala by using monthly test day milk yields (MTDMYs). For developing lactation curve models, data of 936 crossbred cattle sired by 188 bulls spread over a period of 16 years (2002-2017) in seven different field centers of ICAR-Field Progeny Testing Scheme, Kerala were used. Lactation curves using different MTDMY were modeled with Inverse Polynomial Function (IPF), Mixed Log Function (MLF), Parabolic Exponential Function (PEF), Wilmink function (WIF) and Woods function (WOF). Among these, Wilmink Function showed best fitness of good criteria. WIF had maximum R2 (86.45%), low RMSE (0.009949 kg), minimum AIC (-58059.79) and minimum BIC (-9656.57) values. Stepwise backward multiple regression method was used to predict FLMY using different combination of MTDMYs. Wilmink function is adjudged as the most effective function in predicting MTDMYs and FLMY of crossbred cattle of Kerala. The lactation curve based on Wilmink function had 82.67% desired type showing that the management systems adopted for crossbred cattle of Kerala is good.
Pages : 116-120 | 593 Views | 120 Downloads


Journal of Entomology and Zoology Studies Journal of Entomology and Zoology Studies
How to cite this article:
Prakash G, Anilkumar K, V Jamuna. Comparison of five different lactation curve models for prediction of monthly test day milk yields and first lacatation milk yield in crossbred cattle of Kerala. J Entomol Zool Stud 2019;7(4):116-120.

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