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Compensatory Growth of Intensively Raised Bull Calves III. Restricted Refeeding and Breed Differences^{1, 2,}

Agricultural Research Organization, Volcani Center, Bet Dagan, and Neve Ya'ar Regional Experiment Station, Haifa Post Office, Israel

Abstract

In two experiments, 80 Israeli-Friesian and Hereford x Arab bull calves were restricted to a maintenance ration for 90 days, from either 180 or 270 days of age. During the refeeding period previously restricted bull calves showed compensatory growth, i.e., they gained significantly faster than continuously fed controls.

During the entire experiment bull calves fed a maintenance ration for 90 days gained slower but converted feed to gain more efficiently than controls fed ad libitum. Throughout the experiment Israeli-Friesian bull calves fed a maintenance ration for 90 days gained live weight and converted feed to gain at about the same rate as bull calves continuously fed a restricted ration to consume the same amount of total feed. However, Hereford x Arab bull calves fed a maintenance ration for 90 days gained slower than the respective controls fed the same total amount of feed on a continuously restricted ration.

It is concluded that in intensively raised bull calves feeding a maintenance ration for 90 days may prolong the fattening period but may produce feed-to-gain conversion ratios which are equal to or better than those of continuously fed controls.

¹ Contribution from the Agricultural Research Organization, Volcani Center, Bet Dagan, Israel. 1973 Series, No. 335-E.

² This research was financed in part by a grant made by the U.S. Department of Agriculture, under P.L. 480.