Effect of dietary concentrate on rumen fermentation, digestibility, and nitrogen losses in dairy cows

M. Agle, Alexander Nikolov Hristov, S. Zaman, C. Schneider, P. M. Ndegwa, V. K. Vaddella

Research output: Contribution to journalArticle

72 Citations (Scopus)

Abstract

The objective of this experiment was to investigate the effect of level of dietary concentrate on rumen fermentation, digestibility, and N losses in lactating dairy cows. The experiment was a replicated 3 × 3 Latin square design with 6 cows and 16-d adaptation periods. Ruminal contents were exchanged between cows at the beginning of each adaptation period. Data for 2 of the diets tested in this experiment are presented here. The diets contained (dry matter basis): 52% (LowC; control) and 72% (HighC) concentrate feeds. Crude protein contents of the diets were 16.5 and 16.4%, respectively. The HighC diet decreased ruminal pH and ammonia concentration and increased propionate concentration compared with LowC. Acetate:propionate ratio was greater for LowC than for HighC. Rumen methane production and microbial protein synthesis were unaffected by diet. Dry matter intake was similar among diets, but milk yield was increased by HighC compared with LowC (36.0 and 33.2. kg/d, respectively). Milk fat percentage and yield and total-tract apparent NDF digestibility were decreased by HighC compared with LowC. More ruminal ammonia N was transferred into milk protein with HighC than with LowC. Urinary N excretion, plasma urea N, and milk urea N concentration were not affected by diet. The ammonia emitting potential of manure was similar between LowC and HighC diets. Increased concentrate proportion in the diet of dairy cows resulted in reduced ruminal ammonia concentration and enhanced ammonia utilization for milk protein synthesis. These effects, however, did not result in reduced urinary N losses and only marginally improved milk N efficiency. Increasing dietary concentrate was not a successful strategy to mitigate enteric methane production and ammonia emissions from manure.

Original languageEnglish (US)
Pages (from-to)4211-4222
Number of pages12
JournalJournal of dairy science
Volume93
Issue number9
DOIs
StatePublished - Sep 1 2010

Fingerprint

Rumen
rumen fermentation
Fermentation
Nitrogen
dairy cows
concentrates
digestibility
Diet
Ammonia
nitrogen
ammonia
diet
Milk
Manure
Milk Proteins
Methane
Propionates
methane production
dairy protein
propionates

All Science Journal Classification (ASJC) codes

  • Food Science
  • Animal Science and Zoology
  • Genetics

Cite this

Agle, M. ; Hristov, Alexander Nikolov ; Zaman, S. ; Schneider, C. ; Ndegwa, P. M. ; Vaddella, V. K. / Effect of dietary concentrate on rumen fermentation, digestibility, and nitrogen losses in dairy cows. In: Journal of dairy science. 2010 ; Vol. 93, No. 9. pp. 4211-4222.
@article{dcd5f5b3b10c441e81eb0a73da3b039b,
title = "Effect of dietary concentrate on rumen fermentation, digestibility, and nitrogen losses in dairy cows",
abstract = "The objective of this experiment was to investigate the effect of level of dietary concentrate on rumen fermentation, digestibility, and N losses in lactating dairy cows. The experiment was a replicated 3 × 3 Latin square design with 6 cows and 16-d adaptation periods. Ruminal contents were exchanged between cows at the beginning of each adaptation period. Data for 2 of the diets tested in this experiment are presented here. The diets contained (dry matter basis): 52{\%} (LowC; control) and 72{\%} (HighC) concentrate feeds. Crude protein contents of the diets were 16.5 and 16.4{\%}, respectively. The HighC diet decreased ruminal pH and ammonia concentration and increased propionate concentration compared with LowC. Acetate:propionate ratio was greater for LowC than for HighC. Rumen methane production and microbial protein synthesis were unaffected by diet. Dry matter intake was similar among diets, but milk yield was increased by HighC compared with LowC (36.0 and 33.2. kg/d, respectively). Milk fat percentage and yield and total-tract apparent NDF digestibility were decreased by HighC compared with LowC. More ruminal ammonia N was transferred into milk protein with HighC than with LowC. Urinary N excretion, plasma urea N, and milk urea N concentration were not affected by diet. The ammonia emitting potential of manure was similar between LowC and HighC diets. Increased concentrate proportion in the diet of dairy cows resulted in reduced ruminal ammonia concentration and enhanced ammonia utilization for milk protein synthesis. These effects, however, did not result in reduced urinary N losses and only marginally improved milk N efficiency. Increasing dietary concentrate was not a successful strategy to mitigate enteric methane production and ammonia emissions from manure.",
author = "M. Agle and Hristov, {Alexander Nikolov} and S. Zaman and C. Schneider and Ndegwa, {P. M.} and Vaddella, {V. K.}",
year = "2010",
month = "9",
day = "1",
doi = "10.3168/jds.2009-2977",
language = "English (US)",
volume = "93",
pages = "4211--4222",
journal = "Journal of Dairy Science",
issn = "0022-0302",
publisher = "Elsevier Limited",
number = "9",

}

Effect of dietary concentrate on rumen fermentation, digestibility, and nitrogen losses in dairy cows. / Agle, M.; Hristov, Alexander Nikolov; Zaman, S.; Schneider, C.; Ndegwa, P. M.; Vaddella, V. K.

In: Journal of dairy science, Vol. 93, No. 9, 01.09.2010, p. 4211-4222.

Research output: Contribution to journalArticle

TY - JOUR

T1 - Effect of dietary concentrate on rumen fermentation, digestibility, and nitrogen losses in dairy cows

AU - Agle, M.

AU - Hristov, Alexander Nikolov

AU - Zaman, S.

AU - Schneider, C.

AU - Ndegwa, P. M.

AU - Vaddella, V. K.

PY - 2010/9/1

Y1 - 2010/9/1

N2 - The objective of this experiment was to investigate the effect of level of dietary concentrate on rumen fermentation, digestibility, and N losses in lactating dairy cows. The experiment was a replicated 3 × 3 Latin square design with 6 cows and 16-d adaptation periods. Ruminal contents were exchanged between cows at the beginning of each adaptation period. Data for 2 of the diets tested in this experiment are presented here. The diets contained (dry matter basis): 52% (LowC; control) and 72% (HighC) concentrate feeds. Crude protein contents of the diets were 16.5 and 16.4%, respectively. The HighC diet decreased ruminal pH and ammonia concentration and increased propionate concentration compared with LowC. Acetate:propionate ratio was greater for LowC than for HighC. Rumen methane production and microbial protein synthesis were unaffected by diet. Dry matter intake was similar among diets, but milk yield was increased by HighC compared with LowC (36.0 and 33.2. kg/d, respectively). Milk fat percentage and yield and total-tract apparent NDF digestibility were decreased by HighC compared with LowC. More ruminal ammonia N was transferred into milk protein with HighC than with LowC. Urinary N excretion, plasma urea N, and milk urea N concentration were not affected by diet. The ammonia emitting potential of manure was similar between LowC and HighC diets. Increased concentrate proportion in the diet of dairy cows resulted in reduced ruminal ammonia concentration and enhanced ammonia utilization for milk protein synthesis. These effects, however, did not result in reduced urinary N losses and only marginally improved milk N efficiency. Increasing dietary concentrate was not a successful strategy to mitigate enteric methane production and ammonia emissions from manure.

AB - The objective of this experiment was to investigate the effect of level of dietary concentrate on rumen fermentation, digestibility, and N losses in lactating dairy cows. The experiment was a replicated 3 × 3 Latin square design with 6 cows and 16-d adaptation periods. Ruminal contents were exchanged between cows at the beginning of each adaptation period. Data for 2 of the diets tested in this experiment are presented here. The diets contained (dry matter basis): 52% (LowC; control) and 72% (HighC) concentrate feeds. Crude protein contents of the diets were 16.5 and 16.4%, respectively. The HighC diet decreased ruminal pH and ammonia concentration and increased propionate concentration compared with LowC. Acetate:propionate ratio was greater for LowC than for HighC. Rumen methane production and microbial protein synthesis were unaffected by diet. Dry matter intake was similar among diets, but milk yield was increased by HighC compared with LowC (36.0 and 33.2. kg/d, respectively). Milk fat percentage and yield and total-tract apparent NDF digestibility were decreased by HighC compared with LowC. More ruminal ammonia N was transferred into milk protein with HighC than with LowC. Urinary N excretion, plasma urea N, and milk urea N concentration were not affected by diet. The ammonia emitting potential of manure was similar between LowC and HighC diets. Increased concentrate proportion in the diet of dairy cows resulted in reduced ruminal ammonia concentration and enhanced ammonia utilization for milk protein synthesis. These effects, however, did not result in reduced urinary N losses and only marginally improved milk N efficiency. Increasing dietary concentrate was not a successful strategy to mitigate enteric methane production and ammonia emissions from manure.

UR - http://www.scopus.com/inward/record.url?scp=77955606642&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=77955606642&partnerID=8YFLogxK

U2 - 10.3168/jds.2009-2977

DO - 10.3168/jds.2009-2977

M3 - Article

C2 - 20723695

AN - SCOPUS:77955606642

VL - 93

SP - 4211

EP - 4222

JO - Journal of Dairy Science

JF - Journal of Dairy Science

SN - 0022-0302

IS - 9

ER -