Predicting nitrogen excretion from cattle

Journal of Dairy Science
K F ReedE Kebreab

Abstract

Manure nitrogen (N) from cattle production facilities can lead to negative environmental effects, such as contribution to greenhouse gas emissions, leaching and runoff to aqueous ecosystems leading to eutrophication, and acid rain. To mitigate these effects and to improve the efficiency of N use, accurate prediction of N excretion and secretions are required. A genetic algorithm was implemented to select models to predict fecal, urinary, and total manure N excretions, and milk N secretions from 3 classes of animals: lactating dairy cows, heifers and dry cows, and steers. Two tiers of model classes were developed for each category of animals based on model input requirements. A total of 6 models for heifers and dry cows and steers and an additional 2 models for lactating dairy cattle were developed. Evaluation of the models using K-fold cross validation based on all data and using the most recent 6 yr of data showed better prediction for total manure N and fecal N compared with urinary N excretion, which was the most variable response in the database. Compared with extant models from the literature, the models developed in this study resulted in a significant improvement in prediction error for fecal and urinary N excretions fro...Continue Reading

References

Dec 1, 1996·Journal of Animal Science·S Tamminga
Jan 22, 1998·Journal of Dairy Science·V A WilkersonD P Casper
Apr 12, 2002·Environmental Science & Technology·Donald R McCubbinFrank Divita
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Jun 14, 2013·Animal : an International Journal of Animal Bioscience·J DijkstraA Bannink

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Citations

Jun 21, 2016·Journal of Dairy Science·A C B JohnsonE Kebreab
Feb 22, 2017·Journal of Dairy Science·Alex Bach, Victor Cabrera
Feb 7, 2021·Environmental Research·Mphethe I Tongwane, Mokhele E Moeletsi
Apr 4, 2021·Animals : an Open Access Journal From MDPI·Hewa Bahithige Pavithra Chathurangi AriyarathneNicolas Lopez-Villalobos
Apr 12, 2021·Journal of Dairy Science·M Spanghero, Z M Kowalski
Nov 12, 2021·Tropical Animal Health and Production·Dixan Pozo-LeyvaCarlos Manuel Arriaga-Jordán

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