Effects of Different Dietary NFC/NDF and Thiamine on Rumen Metabolism in Dairy Cows

CAI Jingjing; WANG Hongrong; FU Cong; LI Zhiteng; ZHU Jingjing

doi:10.3969/j.issn.1006-267x.2013.09.013

Chinese Journal of Animal Nutrition >

2013 , Vol. 25 >Issue 9: 2012 - 2020

DOI: https://doi.org/10.3969/j.issn.1006-267x.2013.09.013

Ruminant Nutrition

Effects of Different Dietary NFC/NDF and Thiamine on Rumen Metabolism in Dairy Cows

CAI Jingjing ,
WANG Hongrong ,
FU Cong ,
LI Zhiteng ,
ZHU Jingjing

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College of Animal Science and Technology, Yangzhou University, Yangzhou 225009, China

Received date: 2012-03-12

Online published: 2013-08-18

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Abstract

This experiment was conducted to study the effects of different dietary non-fiber carbohydrates to neutral detergent fiber ratios (NFC/NDF) and thiamine on rumen metabolism in Holstein dairy cows. Three healthy Holstein dairy cows equipped with rumen fistulous were used in a 3?3 Latin square design experiment. The experiment was carried out for 3 periods with 23 days (20-day pre-trial period and 3-day trial period) per period. The cows were fed three different diets, which were NFC/NDF=1.41 (concentrate to forage 5:5), NFC/NDF=2.01 (concentrate to forage 7:3) and NFC/NDF=2.01 (concentrate to forage 7:3)+180 mg/kg thiamine, respectively. The results showed as follows: with the increase of dietary NFC/NDF, rumen fluid pH was significantly decreased (P<0.05), the NH₃-N concentration of rumen fluid was significantly increased (P<0.05 or P<0.01), and the lactic acid concentration of rumen fluid was also significantly increased (P<0.05 or P<0.01), while the acetic acid proportion (P<0.05) and acetic acid/propionic acid (P<0.05 or P<0.01) of rumen fluid were significantly decreased, and the proportions of propionic acid proportion and butyric acid of rumen fluid were significantly increased (P<0.05 or P<0.01). The dietary supplementation of thiamine tended to increase rumen fluid pH (P>0.05), while rumen fluid NH₃-N concentration was significantly decreased (P<0.05), lactic acid concentration was decreased significantly (P<0.05 or P<0.01), and acetic acid proportion and acetic acid/propionic acid of rumen fluid were significantly decreased (P<0.05), while propionic acid proportion was significantly increased (P<0.05 or P<0.01). These results indicate that the increase of dietary NFC/NDF can induce subactue ruminal acidosis, and the alterative dietary supplementation of thiamine at 180 mg/kg can release the rumen acidosis.

Key words： NFC/NDF; thiamin; subactue ruminal acidosis; rumen fermentation

Cite this article

CAI Jingjing , WANG Hongrong , FU Cong , LI Zhiteng , ZHU Jingjing . Effects of Different Dietary NFC/NDF and Thiamine on Rumen Metabolism in Dairy Cows[J]. Chinese Journal of Animal Nutrition, 2013 , 25(9) : 2012 -2020 . DOI: 10.3969/j.issn.1006-267x.2013.09.013

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