TY - JOUR AU - Steevens, B., J. AB - Summary The effects of adding inert polyethylene material to the ration for lactating dairy cows were evaluated in an 8-week trial. Under the conditions of this trial, the polyethylene was not an effective substitute for natural roughage in terms of maintaining a rumen fermentation pattern commensurate with desired milk fat percentage. There was no effect on total milk yield. The incidence of feed refusals was lower in the groups fed polyethylene than in the group fed none. There was a progressive decline in the amount of polyethylene retained in the rumen of fistulated animals fed a ration containing 10% alfalfa hay. This content is only available as a PDF. Author notes 2 Present address: Facultad de Agronomia, Palmira, Colombia. 3 Department of Animal Sciences and Industry. Copyright 1971 by American Society of Animal Science. American Society of Animal Science TI - Polyethylene as Roughage Substitute in Rations for Dairy Cattle JF - Journal of Animal Science DO - 10.2527/jas1971.3261239x DA - 1971-06-01 UR - https://www.deepdyve.com/lp/oxford-university-press/polyethylene-as-roughage-substitute-in-rations-for-dairy-cattle-b9nMwO8h4B SP - 1239 EP - 1244 VL - 32 IS - 6 DP - DeepDyve ER -