Effects of pasteurization of potato slurry by-product fed in corn-or barley-based beef finishing diets.

摘要: Pasteurization of vegetable by-products such as potato slurry (PS) before feeding may be necessary to prevent the spread pathogens and beef carcass blemishes. We hypothesized that pasteurization would increase ruminal fermentability PS starch. Four ruminally cannulated crossbred steers (initial BW = 432) were used in a 4 x Latin square experiment with 2 factorial arrangement treatments examine main effects interactions (54.4 degrees C for h) grain type (GT; dry-rolled corn barley) on total tract digestion finishing diets. Diets contained 7% alfalfa hay 14% (DM basis) fed ad libitum three times daily. Corn-based diets had 71.7% corn, whereas barley-based 60% barley 11.7% corn. resulted greater (P 0.004) soluble, rapidly degradable starch (34.3 vs. 26.7% pasteurized nonpasteurized PS, respectively). Ruminal fluid pH was more acidic < 0.07) corn-based than at 0200 2100 (sample time GT; P 0.05). 0.06) 1400 containing compared other dietary 0.04). Minimum maximum 0.10) 6.0 0.04) proportion day In vitro incubation measurements revealed lower ammonia N concentration. concentration 0.11) Steers 0.02) DMI lesser 0.05) digestibility DM ADF increased digestibility. Results indicate starch, fermentability, PS. Grain interacted periodic reductions pH. Feeding management critical when