e-Cow: an animal model that predicts herbage intake, milk yield and live weight change in dairy cows grazing temperate pastures, with and without supplementary feeding

Animal : an International Journal of Animal Bioscience
J BaudraccoN C Friggens

Abstract

This animal simulation model, named e-Cow, represents a single dairy cow at grazing. The model integrates algorithms from three previously published models: a model that predicts herbage dry matter (DM) intake by grazing dairy cows, a mammary gland model that predicts potential milk yield and a body lipid model that predicts genetically driven live weight (LW) and body condition score (BCS). Both nutritional and genetic drives are accounted for in the prediction of energy intake and its partitioning. The main inputs are herbage allowance (HA; kg DM offered/cow per day), metabolisable energy and NDF concentrations in herbage and supplements, supplements offered (kg DM/cow per day), type of pasture (ryegrass or lucerne), days in milk, days pregnant, lactation number, BCS and LW at calving, breed or strain of cow and genetic merit, that is, potential yields of milk, fat and protein. Separate equations are used to predict herbage intake, depending on the cutting heights at which HA is expressed. The e-Cow model is written in Visual Basic programming language within Microsoft Excel®. The model predicts whole-lactation performance of dairy cows on a daily basis, and the main outputs are the daily and annual DM intake, milk yield and ...Continue Reading

References

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Feb 1, 2007·Animal : an International Journal of Animal Bioscience·N C Friggens, J R Newbold

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Citations

Dec 22, 2012·Animal : an International Journal of Animal Bioscience·J BaudraccoT N Barry
Jan 13, 2012·Proceedings. Biological Sciences·Kim JensenStephen J Simpson
Mar 7, 2014·Proceedings. Biological Sciences·Christina G HalpinCandy Rowe
Apr 16, 2014·Journal of Dairy Science·M D MurphyJ Upton
May 24, 2016·Animal : an International Journal of Animal Bioscience·E RuelleL Shalloo
Apr 4, 2019·Translational Animal Science·Luis O TedeschiMozart A Fonseca
Dec 23, 2020·Animals : an Open Access Journal From MDPI·Sotiria VourakiGeorgios Arsenos

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