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To determine the effects of short-term dietary supplementation of branched-chain amino acids (BCAAs) during nursing (from 3 to 28 days of age) on plasma BCAA levels and subsequent growths in cattle, 12 nursing male Holstein calves, randomly assigned to control and treatment groups (n = 6 in each group), orally received a daily supplement of essential BCAAs (2 g/kg body weight/day; 1:1:1 of valine, leucine and isoleucine) or not. The plasma BCAA levels increased linearly after the administration. During the treatment period, average daily gain (ADG) was lower in the treatment group (0.43±0.07 kg/day) than the controls (0.71±0.07 kg/day, p<0.05). However, at 2 months of age, ADG was significantly higher in the BCAA-treated group (1.16±0.26 kg/day vs. 0.51±0.06 kg/day, p<0.05). Furthermore, at age 8, 9 and 10 month, ADG in the treated group (1.35±0.23, 1.46±0.07 and 1.60±0.16 kg/day, respectively) showed a linear increase and was significantly higher than that in the control group (0.88±0.14, 0.70±0.21 and 1.11±0.11 kg/kg, respectively, p<0.05). Overall, ADG was 15.6% higher in the treatment group (1.26±0.05 kg vs. 1.09±0.04 kg; p<0.05). The final body weight at slaughter was 14.8% higher in the treatment group (759.5±17.7 kg vs. 661.7±21.2 kg, p<0.01). Thus, the supplementation of BCAAs during nursing improves ADG and carcass weight in cattle and is a useful husbandry technique for beef cattle. (Asian-Aust. J. Anim. Sci. 2005. Vol 18, No. 10 : 1440-1444)

Effects of Dietary Supplementation with Branched-chain Amino Acids (BCAAs) during Nursing on Plasma BCAA Levels and Subsequent Growth in Cattle