Effects of protein levels in concentrate on growth performance and nutrient utilization of growing indigenous male goat
Effects of protein levels in concentrate on growth performance and nutrient utilization of growing indigenous male goat were studied. Sixteen Thai indigenous male goats, 5.81 ± 0.40 months old, with average body weight (BW) of 11.5 ± 2.1 kg, were randomly allocated into 4 treatments under a Completely Randomized Design for 180 days study period. Treatment diets consisted of pangola hay ad libitum supplemented with concentrate at 2% of BW (dry matter basis). Crude protein (CP) levels in concentrate were 8, 10, 12 and 14%, respectively. There were no significant differences (P>0.05) among treatments of total feed intake and hay intake while concentrate intake (40.39, 41.89, 42.67 and 43.12 g/KgBW0.75, respectively) and ADG of goats (37.96, 51.74, 50.00 and 56.25 g/d, respectively) increase linearly when the levels of CP in concentrate were increased. There was no effect of CP levels on digestibility coefficient of nutrients and nitrogen balance (P>0.05). Increasing CP contents in the concentrate significantly (P<0.05) increased the amount of nitrogen intake (5.36, 7.38, 8.73 and 9.35 g/d) and blood urea nitrogen (7.78, 11.45, 16.38 and 21.16 mg %). Therefore, the optimal CP level in concentrate for growing Thai indigenous male goat Thai fed with pangola hay, is 14% DM.
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