Two experiments were carried out in this study. The first one was conducted to study the apparent excretion rate and apparent ileal digestibility of melamine. A total of 240 one-day-old Cobb broiler chickens were randomly divided into 2 groups: basal diet group, and basal diet+100 mg/kg melamine group (6 replicates per group and 20 chicks per replicate). Metabolic trials were carried from d 15 to 21 and d 36 to 42. The second trial was conducted to study the effects of melamine on nutrient availability and feed passage rate in broilers. A total of 48 one-day-old Cobb broiler chickens were randomly divided into 4 groups with 6 replicates per group and 2 broilers per replicate. Broilers in different groups were fed with the diets containing 0, 500, 1 000, and 2 000 mg/kg melamine, respectively. At d 21 and 42, a 24 hours trial was carried to determine the effects of melamine on feed passage rate in broilers. The results showed that the apparent excretion rate and apparent ileal digestibility of melamine in broilers were higher, and they were 93.71% and 68.72% at d 21, 96.44% and 69.45% at d 42, respectively, but there was no significant difference between d 21 and 42 (P>0.05); the energy apparent availability in 1 000 mg/kg group was lower than that in the other groups（P<0.05）; there were no significant differences in the availabilities of protein, calcium and phosphorus among all groups (P>0.05). At d 21, the feed passage rate was fast after feeding for 2 h, and the cumulative recovery rate after feeding for 6 h in 1 000 mg/kg group was lower than that in the control group and 2 000 mg/kg group (P<0.05), and there was no significant difference between 1 000 mg/kg group and 500 mg/kg group (P>0.05). At d 42, the feed passage rate was slow after feeding for 2 h, the cumulative recovery rates after feeding for 24 h in 1 000 and 2000 mg/kg group were significantly decreased than those in the control group and 500 mg/kg group (P<0.05). It is concluded that melamine added to the diet is easily absorbed and excreted in broilers, and its absorption and excretion are improved with the day of age increasing; the energy availability in broilers fed the diet containing melamine in short period will be decreased, but there are no significant differences on the availabilities of crude protein, calcium and phosphorus; the feed passage rate becomes lower with the dietary melamine level increasing.［Chinese Journal of Animal Nutrition, 2011, 23（8）：1394 -1401］
DING Xuemei,ZHANG Keying,WANG Liang,BAI Shiping,WU Caimei,WU Xiuqun
. Melamine: Digestion, Metabolism and Effects on Nutrient Availability and Feed Passage Rate in Broilers[J]. Chinese Journal of Animal Nutrition, 2011
, 23(08)
: 1394
-1401
.
DOI: 10.3969/j.issn.1006-267x.2011.08.019
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