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Effect of Ration Ingredient Change on Performance of Growing-Finishing Swine^{1, 2,}

Oklahoma Agriculture Experiment Station, Stillwater 74074

Abstract

Three experiments involving 188 pigs were conducted to study the effect of marked change of ration ingredients on the performance of growing-finishing swine. In Experiments 1 and 2, marked change of ration ingredients on a weekly basis in hand calculated rations had little effect on average daily gain, feed-gain ratio, daily feed intake and probed backfat thickness. In Experiment 3, daily gain, feed-gain ratio and daily feed intake was similar for pigs fed a computerized least cost ration reformulated every 29 days or a least cost ration which was formulated at the beginning of the trial and fed continuously thereafter. The pigs fed both least cost rations did not perform as well as pigs fed the standard basal ration. However, feed ingredient cost per unit of gain was the least for the pigs fed the computerized least cost ration reformulated every 29 days as compared to the other two rations.

¹ Journal Article 3042 of the Agricultural Experiment Station, Oklahoma State University, Stillwater 74074.

² Acknowledgment is made to Merck and Co., Inc. Rahway, New Jersey, for supplying the L-lysine.

³ Department of Animal Sciences and Industry.