Effects of slow-release urea and rumen-protected methionine and histidine on performance of dairy cows

Journal of Dairy Science
F GiallongoC Parys

Abstract

This experiment was conducted with the objective to investigate the effects of slow-release urea and rumen-protected (RP) Met and His supplementation of a metabolizable protein (MP)-deficient diet (according to NRC, 2001) on lactation performance of dairy cows. Sixty lactating Holstein cows were used in a 10-wk randomized complete block-design trial. Cows were fed a covariate diet for 2 wk and then assigned to one of the following treatments for an 8-wk experimental period: (1) MP-adequate diet [AMP; 107% of MP requirements, based on the National Research Council (NRC, 2001)]; (2) MP-deficient diet (DMP; 95% of MP requirements); (3) DMP supplemented with slow-release urea (DMPU); (4) DMPU supplemented with RPMet (DMPUM); and (5) DMPUM supplemented with RPHis (DMPUMH). Total-tract apparent digestibility of dry matter, organic matter, neutral detergent fiber, and crude protein, and urinary N and urea-N excretions were decreased by DMP, compared with AMP. Addition of slow-release urea to the DMP diet increased urinary urea-N excretion. Dry matter intake (DMI) and milk yield (on average 44.0±0.9kg/d) were not affected by treatments, except DMPUMH increased DMI and numerically increased milk yield, compared with DMPUM. Milk true pro...Continue Reading

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Citations

Apr 10, 2015·Tropical Animal Health and Production·Hugo ImaizumiFlávio Augusto Portela Santos
Jul 21, 2015·Journal of Dairy Science·F GiallongoA N Hristov
Jan 31, 2017·Journal of Dairy Science·F GiallongoA N Hristov
Nov 21, 2017·Journal of Dairy Science·Charles G Schwab, Glen A Broderick
Aug 9, 2017·Tropical Animal Health and Production·Abdelfatah Abdelsalam MustafaJawid Sediqi
Sep 4, 2017·Journal of Dairy Science·J R R DóreaL E Armentano
Nov 6, 2018·Journal of Dairy Science·T Amirabadi FarahaniM Kazemi-Bonchenari
Apr 30, 2019·Journal of Dairy Science·A N HristovZ Yu
Apr 2, 2018·Journal of Dairy Science·C LeeW P Weiss
Feb 13, 2021·PloS One·Saheed A SalamiJules Taylor-Pickard
Jan 18, 2021·Journal of Dairy Science·H LapierreD R Ouellet
Jun 3, 2021·Animals : an Open Access Journal From MDPI·Jungeun Kim, Hong-Gu Lee
Aug 8, 2021·Animals : an Open Access Journal From MDPI·Jung-Eun Kim, Hong-Gu Lee

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