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.
XIE Ming
,
HAN Xufeng
,
HOU Shuisheng
,
HUANG Wei
,
YU Junying
. Interrelationship between Tryptophan and Niacin of Pekin Ducks Aged from 1 to 14 Days[J]. Chinese Journal of Animal Nutrition, 2012
, 24(12)
: 2335
-2341
.
DOI: 10.3969/j.issn.1006-267x.2012.12.007
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