3.2. อาหารบริโภคThe amount of cassava peels refused, as a percent of total offered, averaged 15.7% (range 10-20%). The chemical composition of the refused cassava peels was not different from that offered, an indication that there was no significant selection of the peels by the animals. All animals consumed their allowance of ficus leaves within 2 h of it being offered. Supplementation increased (P<0.05) the total intake of DM and nitrogen (Table 2). Daily total DM intake ranged from 44.0 g kg -~ LW °75 for animals that did not receive any supplement to 81.2gkg -~ LW °75 for those which received a supplement of 250 g d ~ of ficus leaves.Daily DM intake by animals which received a supplement of 100 g d- J or more of ficus leaves was above the 'expected intake' of 58.9 g kg -~ LW °75 for this class of animals (NRC, 1985). Daily nitrogen intake increased from 0.44gkg -~ LW °75 for animals which did not receive any supplement to 1.33 g kg -1 LW °'75 for those which received 250 g d -1 of ficus leaves. The average intake of the basal feed by animals that received 150 g d -1 of the supplement was 55.1 g kg 1 LW0.75 di.It is pertinent to note that the supplement alone accounted for about 26% of the total DM consumed by these animals. In animals that received 200gd -1 or more of the supplement, the corresponding figure was in excess of 30%. There was a tendency towards a decline in the amount of the basal feed consumed when the quantity of supplement provided exceeded 150 g d -1. The low DM intake by sheep which received 60 g d ~ or less of leaves could have been due to the low level and poor balance of certain nutrients,especially nitrogen and sulphur. As suggested by Preston & Leng (1986), an imbalance or inadequacy of such nutrients would reduce rumen ammonia production and microbial growth and activity. This would indirectly slow down the rates of digestion and passage and subsequently reduce intake.
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