Development and evaluation of equations for prediction of feed intake for lactating Holstein dairy cows

Journal of Dairy Science
D K RoselerW C Stone

Abstract

Improved prediction equations for dry matter intake (DMI) of Holstein cows that consume high energy diets were developed using regression techniques applied to a comprehensive database. The equations for predicting DMI, which were dependent on parity, accounted for the effects of milk yield, milk protein, body weight (BW), BW change, days pregnant, ambient temperature, relative humidity, and night cooling. A simplified prediction equation of DMI for farm application was developed and based on milk protein yield and BW at calving. An ambient temperature and a lag adjustment factor for early lactation were developed to improve accuracy of prediction of DMI of dairy cows in early lactation. The developed equations for DMI were evaluated against six independent data files. These equations accounted for 55 to 98% of the variation of the weekly group DMI of the independent validation data. The remainder of the variation in intake was attributed to diet, management, and undescribed animal factors. The equations developed in this study had a mean proportional bias of 5.6% and a mean square prediction error of 5.45 kg2/d. Predicted intake using the new equations was within 3 to 8% of actual intake. The new equations must be applied to s...Continue Reading

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Citations

Mar 24, 2012·Animal : an International Journal of Animal Bioscience·P HuhtanenJ Nousiainen
Oct 4, 2012·Animal : an International Journal of Animal Bioscience·H Khelil-ArfaP Faverdin
Jun 19, 2002·The Proceedings of the Nutrition Society·C H Knight
Sep 22, 2015·Animal : an International Journal of Animal Bioscience·I HalachmiE Maltz
Apr 17, 2018·Animal : an International Journal of Animal Bioscience·A L SilvaM I Marcondes
Oct 26, 2000·Journal of Dairy Science·O P Vazquez, T R Smith
May 16, 2001·Journal of Dairy Science·O P Vazquez, T R Smith
Sep 13, 2000·Journal of Dairy Science·T F DunlapR A Erdman
Jul 25, 2000·Journal of Dairy Science·K L Ingvartsen, J B Andersen
Mar 5, 2003·Journal of Dairy Science·J Fuentes-PilaD K Beede
Aug 26, 2004·Journal of Dairy Science·I HalachmiE Maltz
Apr 16, 2014·Journal of Dairy Science·M C SouzaD C Moura
Jul 22, 2019·Journal of Dairy Science·R A de SouzaM J VandeHaar
Oct 4, 2007·Journal of Animal Science·J B GaughanA Lisle

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