Livestock Research for Rural Development (13) 4 2001
نویسندگان
چکیده
Eight Mong Cai castrate male pigs of mean initial weight 12.3 kg were fed diets containing sugar palm (Borassus flabellifer) syrup and dry fish substituted or not with ensiled cassava leaves (0 and 50% of the daily ration in dry basis) according to a change over design. The silage was made from sun-dried, wilted, chopped leaves and petioles in a single batch of cassava foliage harvested after 8weeks of regrowth. The pH was 4.39, DM 41.2%, NDF 66.7%, N 2.87% and cyanide 120 mg/kg in dry basis. Mean environmental temperature was 34.5C at midday (12:00) during the trial in May 2001. The pattern of feed intake was characterized by a very fast intake of the syrup and a slow ingestion of solid materials. There were no silage refusals. Voluntary feed intake was 36.6 g DM/kg body weight per day. The animals were in a positive body weight balance when they were fed the ensiled cassava leaf -based diet and averaged 140 g body weight gain during the trial. Nutrient digestibility of the silage as predicted by difference (n = 8) was DM 77.7%, organic matter 79.8%, NDF 82.5% and N 74.2%. There appeared to be a positive response in N retention due to incorporation of cassava leaf silage in the diet, either related to N intake (improvement of 10.6%) or to N digested (improvement of 19.2%; P<0.10). It appears that young Mong Cai pigs have a high capacity for digestion of cell wall materials, further supported by lower faecal pH values (P<0.05) and DM concentration (P<0.01) in the diet containing cassava leaf silage (6.74 and 29.3%) as compared to the basal diet (7.26 and 39.1%). It is concluded that total N digestibility by pigs of ensiled cassava leaves can be high when the dietary protein supply is high and rich in sulphur amino acids.
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