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Acetic Acid Treatment of Reconstituted Sorghum Grain for Dairy Cos¹

Department of Animal Science, Texas A&M University, College Station, 77843

ABSTRACT

Rations containing air-dry (90% dry matter), water reconstituted (70% dry matter) or acetic acid reconstituted (70% dry matter, 2% acetic acid) sorghum grain were compared in digestion and production trials. Coefficients of apparent digestibility for all chemical components were highest for the water reconstituted grain ration and lowest for the dry grain ration; however, only soluble sugars, starch and ash differences were statistically significant. Lactating cows fed a 40:60 hay: concentrate ration consumed equal quantities of total dry matter, but cows fed the two reconstituted rations consumed more hay and less concentrate dry matter than cows fed the dry grain ration. Fat-corrected milk production was not affected by grain treatment, but actual milk production was higher by cows fed the water reconstituted grain ration than cows fed dry grain ration. Milk fat percent and yield were decreased by water recon-stitution, yet no difference occurred between acetic acid reconstitution and dry grain rations. Milk protein percent was higher for cows fed the acetic acid reconstituted grain ration than those fed the dry grain ration. Molar percentage of ruminal acetic acid from cows fed the water reconstituted grain ration was lower than from those fed the other two rations. Acetic acid from reconstituted grain was sufficient to maintain ruminal acetic acid and milk fat percentages.

¹ Technical Paper TA-00917 of the Texas Agricultural Experiment station, College Station.