本试验旨在研究1~14日龄北京鸭烟酸与色氨酸的互作关系。试验采用4×5二因子完全随机试验设计,设4个饲粮烟酸水平(35、75、115和155 mg/kg),5个饲粮色氨酸水平(0.132%、0.167%、0.202%、0.237%和0.272%)。将840只1日龄健康雄性北京鸭随机分为20个组,每组6个重复,每个重复7只鸭。试验期14 d。结果表明:1)饲粮中单独补充色氨酸可缓解饲粮烟酸缺乏导致的北京鸭生长抑制(P<0.05),而饲粮中单独补充烟酸不能缓解饲粮色氨酸缺乏导致的北京鸭生长抑制(P>0.05)。2)依据折线模型,以平均日增重为评价指标,1~14日龄北京鸭烟酸需要量为81 mg/kg。3)依据折线模型,以平均日增重为评价指标,当饲粮烟酸水平分别为35、75、115和155 mg/kg时,1~14日龄北京鸭色氨酸需要量分别为0.254%、0.169%、0.170%和0.172%。t检验分析表明,饲粮烟酸水平为35 mg/kg时色氨酸需要量极显著高于其他3个饲粮烟酸水平下色氨酸需要量(P<0.01)。综合以上试验结果得出,北京鸭饲粮中烟酸与色氨酸之间的互作关系表现在饲粮烟酸水平对色氨酸需要量产生显著影响。当饲粮烟酸缺乏时,1~14日龄北京鸭色氨酸需要量显著升高。
This experiment was conducted to study the interrelationship between tryptophan and niacin of Pekin ducks aged 1 to 14 days. A 4?5 tow factorial experiment design which contained four dietary niacin levels (35, 75, 115 and 155 mg/kg) and five dietary tryptophan levels (0.132%, 0.167%, 0.202%, 0.237% and 0.272%) was used. Eight hundred and forty one-day-old male Pekin ducks were divided into 20 groups with 6 replicates per group and 7 ducks per replicate, and the experiment period lasted for 14 days. The results showed as follows: 1) the supplementation of tryptophan in diets could alleviate the growth depression caused by niacin deficiency (P<0.05), but the supplementation of niacin in diets could not alleviate the growth depression caused by tryptophan deficiency (P>0.05). 2) According to the broken-line regression analysis of average daily gain, the niacin requirement of Pekin ducks aged 1 to 14 days was 81 mg/kg. 3) According to the broken-line regression, the tryptophan requirements of Pekin ducks aged 1 to 14 days were 0.254%, 0.169%, 0.170% and 0.172% when dietary niacin level were 35, 75, 115 and 155 mg/kg, and the tryptophan requirement of Peking ducks fed the diets with niacin level of 35 mg/kg was significantly higher than that of Peking ducks fed the diets with other three niacin levels (P<0.01). In conclusion, the interrelationship between niacin and tryptophan in diets is supported by significant effects of dietary niacin on tryptophan requirement of Pekin ducks. The tryptophan requirement of Pekin ducks aged 1 to 14 days significantly increases when niacin is deficient in diets.
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