Using mathematical models for lactation curve of milk and fat  production in Iranian Holstein cows

M H Jahandar; M Elahi Torshizi; H Farahangfar; M Mohammadi Gohari

doi:10.56093/ijans.v82i9.23658

Authors

M H Jahandar Islamic Azad University, Bam Branch of Kerman, Iran
M Elahi Torshizi Islamic Azad University, Bam Branch of Kerman, Iran
H Farahangfar Islamic Azad University, Bam Branch of Kerman, Iran
M Mohammadi Gohari Islamic Azad University, Bam Branch of Kerman, Iran

https://doi.org/10.56093/ijans.v82i9.23658

Keywords:

Environmental factors, Fat concentration, Lactation curve, Mathematical function

Abstract

An appropriate mathematical model is required to fit into lactation curves to study the environmental and biological variables that affect milk production. This study examined the suitability of 5 mathematical models (linear and nonlinear form of Wood, Wilmink, Guo and Swalve and inverse polynomial function of Nelder) for lactation curve traits (milk, fat yield and fat content) of 305-d milk yield of Iranian Holsteins. Models were compared based on R2, RMSE, and MSPE criteria by using NLIN and REG procedures in SAS. Using GLM procedure in SAS, factors of herd, calving year, calving season, season of production, age at calving, age at test and days in milk were significant on daily milk yield and the fat content during production period (P < 0.01). The study revealed that the linear form of Wood model and Wilmink function were the best for describing milk, fat yield and fat content during 305-d of lactation.

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