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Citation
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HERO ID
1003062
Reference Type
Journal Article
Title
The effects of high levels of rumen degradable protein on rumen pH and histamine concentrations in dairy cows
Author(s)
Pilachai, R; Schonewille, JT; Thamrongyoswittayakul, C; Aiumlamai, S; Wachirapakorn, C; Everts, H; Hendriks, WH
Year
2012
Is Peer Reviewed?
1
Journal
Journal of Animal Physiology and Animal Nutrition
ISSN:
0931-2439
EISSN:
1439-0396
Volume
96
Issue
2
Page Numbers
206-213
Language
English
PMID
21366715
DOI
10.1111/j.1439-0396.2011.01139.x
URL
https://onlinelibrary.wiley.com/doi/10.1111/j.1439-0396.2011.01139.x
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Abstract
An experiment was conducted to test the hypothesis that the supplementation of crude protein (CP) results in rumen acidosis and increased histamine concentrations in dairy cows. Six ruminally fistulated, non-pregnant dry cows were fed three experimental rations in a replicated 3 × 3 Latin square design. The CP contents in the low-CP, the high rumen undegradable protein (high-RUP) and the high rumen degradable protein (high-RDP) rations were 112, 259 and 266 g/kg dry matter (DM) respectively. The cows were fed 7.7 kg DM of the concentrates and 2.7 kg DM of rice straw. High levels of RDP in the ration significantly increased the ammonia, total volatile fatty acid (VFA) and histamine concentrations in the rumen fluid. However, supplemental CP, whether degradable or undegradable, did not significantly affect the pH of rumen fluid. Plasma urea nitrogen concentration was higher in both high-RDP and high-RUP in relation to cows fed the low-CP ration. The rise in ruminal histamine concentrations was physiologically non-relevant, most likely because rumen pH was not affected by supplemental CP at the installed level of DM intake. Therefore, it can be concluded that the issue of supplemental CP, rumen pH and ruminal histamine concentrations has not yet been settled. Further research is warranted to understand these relationships.
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IRIS
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Ammonia
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