Association between Ruminal pH and Rumen Fatty Acids Concentrations of Holstein Cows during the First Half of Lactation

Ruminal pH in dairy cows follows a diurnal fluctuation; low values are indicative of subacute ruminal acidosis and associated with alterations rumen fatty acids concentrations. The objective the present study was to prospectively associations between fluid concentrations short, medium, long chain acids, under field conditions during first half lactation 53 Holstein farm. obtained by rumenocentesis, which performed at 30, 90, 150 days milk (DIM). measured immediately after collection portable meter, whereas gas chromatography used for determination acid Mixed linear regression models were data analysis. prevalence (≤5.5) 45.3%, 54.7%, 66.0% DIM, respectively. acetic, propionic, butyric, valeric, isovaleric, caproic linoleic negatively values, acetic propionic ratio positively pH. Under naturally occurring cases, most related