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Ruminant Nutrition and Forage Utilization
Asian-Australasian Journal of Animal Sciences 2001;14(6): 785-790.
DOI: https://doi.org/10.5713/ajas.2001.785    Published online June 1, 2001.
Iodine Supplementation of Leucaena leucocephala Diet for Goats. I. Effects on Nutrient Utilization
D. Rajendran, A. K. Pattanaik, S. A. Khan, S. P. S. Bedi
Twelve indigenous male goats, comprising of six intact and six castrated (2.5-3 years; 24.4 0.62 kg) were assigned evenly into two dietary treatments, viz. I0 and I100 and were used to study the effect of supplementation of iodine on the nutrient utilization when their diet contained Leucaena leaf meal. They were offered a conventional concentrate mixture along with Leucaena leucocephala leaf meal, the latter to meet 50% of their crude protein (CP) requirements, and supplemented with either no iodine (I0) or 0.1 mg of iodine (I100)/day/animal as potassium iodide for a period of 105 days. Wheat straw given ad libitum was the sole source of roughage. A metabolism trial of 8 days duration was conducted after 90 days of experimental feeding. It was observed that the overall dry matter (DM) intake during experimental period was higher (p<0.05) in I100 group as compared to I0 group (508.6 vs. 443.7g d-1). The intake of CP, digestible crude protein (DCP) and metabolisable energy (ME), although non-significant, tended to be higher in the iodine supplemented group, I100. Digestibility of dry matter, organic matter (OM), CP, ether extract and crude fiber (CF) did not differ (p>0.05) between the treatments. However, nitrogen retention was higher (p<0.01) in I100 than I0 with the values being 2.63 and 1.70 g d-1, respectively. No difference (p>0.05) was evident in the retention of calcium and phosphorus between the two groups. The castrated animal exhibited lower DM intake concurrent with higher digestibility of DM and crude fibre (p<0.05), and organic matter and total carbohydrates (p<0.01) when compared to intact ones. It was concluded that supplementation of iodine to leucaena based ration may help in improving the DM intake and nitrogen utilization by goats.
Keywords: Leucaena; Iodine; Nutrient Utilization; Goats

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