Effect of Different Molasses Slurries on the Performance of Preconditioning Calves

Three different commercially available molasses-based supplements were evaluated for their effects on the performance of preconditioning calves during the fall of 2002. One hundred and forty calves (mean body weight, 465 lb) were randomly allotted to one of four treatments. Treatments offered were: 1) 16% crude protein fortified molasses slurry, 2) 16% crude protein fortified molasses slurry plus Alimet® (a bypass methionine source), 3) 32% crude protein fortified molasses slurry, and 4) control (pasture only). Treatment groups grazed four bahiagrass pastures and were rotated between them weekly. Molasses slurries were offered ad libitum in lick tanks. Body weights were monitored weekly. Supplementation of calves with molasses increased (P<0.05) daily body weight gain as compared to control (0.004 lb/d vs -0.13 lb/d). Calves consumed equal amounts (P>0.10) of the 16% crude protein slurry (2.62 lb/ d), the 16% crude protein plus Alimet® slurry (2.59 lb/d), and the 32% crude protein slurry (2.37 lb/d). Daily body weight gain for the trial was not different (P=0.17) among the 16% crude protein slurry (0.04 lb/d), the 16% crude protein plus Alimet® slurry (-0.01 lb/d), and the 32% crude protein slurry (-0.02 lb/d). The calves supplemented with the 16% crude protein slurry had a greater (P=0.01) daily gain than the control calves (0.04 vs 0.13 lb/d). Supplementation with molasses based liquid supplements increased calf weight gains over unsupplemented calves. However none of these products produced acceptable weight gains. INTRODUCTION Preconditioning calves has been around for several decades. Preconditioning means different things to different people. In general preconditioning is a process that involves weaning, vaccinating, and training calves to eat from a bunk that takes place over several weeks. Preconditioned calves are generally healthier and gain better in the feed yard compared to fresh weaned calves. In addition, many feed yards will pay premium prices for preconditioned calves. For producers to maximize their income from a preconditioning period, they need to optimize body weight gain and minimize feed costs.