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Diet formulation as an effective tool for mitigating nitrogen excretion in dairy systems

Published online by Cambridge University Press:  27 September 2013

A. N. Hristov
A. N. Hristov*
Affiliation:
Department of Animal Science, The Pennsylvania State University, University Park, PA 16802, USA
*
†E-mail: anh13@psu.edu
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Abstract

Nitrogen (N) losses and ammonia emissions from livestock operations represent a significant water and air pollutant. It has been repeatedly demonstrated that reduction in dietary protein input results in improved N utilization efficiency and reduced N losses with manure in dairy cows. Reducing dietary protein can also benefit the producer by reducing feed cost. These interventions, however, have to be balanced with the risk of decreased productivity. If animal requirements for metabolizable protein (MP) are not met, productivity cannot be sustained. Supplementation with rumen-protected (RP) amino acids (AA) limiting milk production and milk protein synthesis may compensate for the lack of MP in dairy cow diets. Long-term experiments at Penn State University demonstrated reduced urinary N losses, blood urea, milk urea N, and ammonia emissions from manure with MP-deficient v. MP-adequate diets. In some trials, however, milk production and milk protein yield were decreased with the MP-deficient diets. Supplementation of these diets with RPAA (Lys, Met and His) increased dry matter intake and milk yield of the cows to levels comparable with MP-adequate diets and can be a successful strategy for reducing N losses and maintaining productivity in lactating dairy cows fed low-protein diets.

Keywords

NitrogenAmino AcidDairy Cow
Type
Full Paper
Information
Advances in Animal Biosciences , Volume 4 , Special Issue s1: Proceedings of the Dairy Solutions Symposium, 20th – 21st June 2012, University College Dublin, Dublin, Ireland , September 2013 , pp. 15 - 18
Copyright
Copyright © The Animal Consortium 2013 

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