This experiment was performed to investigate rumen microbial degradation of phytate phosphorus (PP) in rice, maize, and wheat bran feeds by in vitro ruminal batch culture method. Ruminal fluid was collected from 3 rumen-cannulated Holstein cows at the lactation stage, and PP disappearance rate of those grain bran feeds were determined after 3, 12, 24, 48 and 72 h anaerobic incubation with the rumen fluid. The results showed as follows: 1) PP disappearance rate of those grain bran feeds depended on the incubation time. The longer incubation time was, the more PP was hydrolyzed. When the incubation lasted up to 24 h, nearly 90% of PP in the grain bran feeds was hydrolyzed. 2) Within the same grain bran, differences in the potential degradability and degradation rate of PP were also observed between different sources. 3) Consequently, the potential degradability of PP was up to 100% in wheat bran (P<0.000 1), and no significant difference occurred between maize bran (95.58%) and rice bran (96.82%) (P>0.05). The degradation rate of PP in the grain bran feeds was ranked as: rice>maize>wheat. In summary, mixed rumen microorganisms have high ability to hydrolyze PP in grain bran feeds, though there is a difference in degradation of different grain bran feeds.
SHEN Shasha
,
YANG Hongjian
,
ZHANG Zhihui
,
WEN Ya
,
REN Qingchang
,
ZHANG Xiaoming
. A Comparison Study of in Vitro Degradation Characteristic of Phytate Phosphorus in Rice, Maize and Wheat Bran Feeds by Mixed Rumen Microorganisms[J]. Chinese Journal of Animal Nutrition, 2012
, 24(9)
: 1707
-1712
.
DOI: 10.3969/j.issn.1006-267x.2012.09.013
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