[Evaluation of the correlation between ration physically effective fiber and rumen pH in dairy cattle]

ABSTRACT

The current definition of subacute ruminal acidosis [SARA] is based on the pH of the ruminal fluid in dairy cattle and ration physically effective fiber could be used as a non-invasive method for prediction of ruminal pH. The purpose of this study was to evaluate the correlation between ration physically effective fiber, measured using old and modified Penn-state particle separator and ruminal pH. The physically effective fiber measured in the ration of 17 rational group [7 fresh and 10 mid lactation cow groups]. Ruminal fluid obtiained by rumenocentesis and SARA affected cows were detected. The physically effective fiber measured by modifed Penn-state particle separator had a correlation with mean ruminal pH of cows [r= 0.595, p= 0.012] and the ratio of subacute ruminal acidosis affected cows in rational groups [r= -0.533, p= 0.027]. The ration of SARA affected mid lactation groups had less physically effective fiber than non affected groups [p= 0.041]. According to our results, the physically effective fiber measured by modifed Penn-state particle separator had more correlation with ruminal pH in dairy cattle and can be used as a predictive index for ruminal pH