EFFECT OF RAPESEED MEAL AND UREA ON AD LIBITUM CONSUMPTION OF GRAIN RATIONS BY DAIRY COWS

1 December 1968

journal article
Published by Canadian Science Publishing in Canadian Journal of Animal Science

Vol. 48 (3) , 437-442
https://doi.org/10.4141/cjas68-057

Abstract

Three experiments were conducted with dairy cows to determine the effects of rapeseed meal and/or urea upon ad libitum consumption of grain rations. In corn, corn–barley and barley-oat basal rations, replacement of soybean meal (10%) by rapeseed meal (12–13%) resulted in a decrease in grain intake. Substitution of 1.4% or 1.6% urea (22% or 19% of the total crude protein intake) for soybean meal also resulted in decreased ad libitum grain consumption. A combination of rapeseed meal (6%) and urea (08%) was comparable to 12% rapeseed meal in effect upon consumption but less marked than 1.6% urea. No rations containing rapeseed meal had significant effects upon milk composition or production. In one experiment, a significant decrease in production occurred through including 1.6% urea in the grain ration.

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