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Sugar supplementation stimulates growth performance in calves with growth retardation.

The growth effect of sugar supplementation was determined in 49 retarded growth calves. Calves were supplemented with sugar at 1 g/kg BW 2 times weekly for 8 weeks. Glucose tolerance tests prior to the experiment showed no difference between the retarded growth calves and normal growth controls. After sugar supplementation, the calves were classified into 4 groups characterized by high (H) or low (L) periodic changes in daily weight gain (DG) with a breakpoint of 0.8 kg/d in three periods, birth to sugar supplementation (Birth-Pre), the 8 weeks during supplementation (Pre-Post) and after feeding to delivery to market (Post-Market). The periodic DG showed a marked increase after supplementation in Pre-Post and Post-Market compared with before supplementation during Birth-Pre in 2 groups (0.93 and 1.11 vs. 0.51 kg/day for L-H-H [n=19], 0.66 and 1.19 vs. 0.42 kg/day for L-L-H [n=24]), but no difference was observed in L-H-L (n=3) and L-L-L (n=3). Peripheral blood was collected on the day before supplementation (Pre), 8 weeks after supplementation (Post) and eight weeks after cease of supplementation. The blood concentrations of both insulin-like growth factor-1 (IGF-1) and glucose showed significant increases in L-H-H and L-L-H, but decreases in non-esterified fatty acid were observed in L-H-H and L-L-L on day Post compared with day Pre, respectively (p<0.05). At delivery to market, the sugar-supplemented calves had body weights similar to the market average. The growth effect of sugar supplementation could be stimulated through rumen papillae development induce by sucrose, the main component of table sugar.