Nitrate improves ammonia incorporation into rumen microbial protein in lactating dairy cows fed a low-protein diet

Journal of Dairy Science
Rong WangZhi Liang Tan

Abstract

Generation of ammonia from nitrate reduction is slower compared with urea hydrolysis and may be more efficiently incorporated into ruminal microbial protein. We hypothesized that nitrate supplementation could increase ammonia incorporation into microbial protein in the rumen compared with urea supplementation of a low-protein diet fed to lactating dairy cows. Eight multiparous Chinese Holstein dairy cows were used in a crossover design to investigate the effect of nitrate or an isonitrogenous urea inclusion in the basal low-protein diet on rumen fermentation, milk yield, and ruminal microbial community in dairy cows fed a low-protein diet in comparison with an isonitrogenous urea control. Eight lactating cows were blocked in 4 pairs according to days in milk, parity, and milk yield and allocated to urea (7.0 g urea/kg of dry matter of basal diet) or nitrate (14.6 g of NO3-/kg of dry matter of basal diet, supplemented as sodium nitrate) treatments, which were formulated on 75% of metabolizable protein requirements. Nitrate supplementation decreased ammonia concentration in the rumen liquids (-33.1%) and plasma (-30.6%) as well as methane emissions (-15.0%) and increased dissolved hydrogen concentration (102%), microbial N (22.8%...Continue Reading

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Citations

Apr 26, 2020·Journal of Animal Physiology and Animal Nutrition·María Laura VillarJohn Vivian Nolan
Jan 30, 2019·Journal of Dairy Science·Rong WangZhi Liang Tan
Aug 17, 2019·Journal of Animal Physiology and Animal Nutrition·Maria L VillarJohn V Nolan
Sep 29, 2020·Journal of Dairy Science·X Y FengE Kebreab

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