The experiment was conducted to study the effects of riboflavin on performance, hormone secretion and immune organ development of caged growing laying ducks aged from 5 to 11 weeks, and aimed to discuss a suitable supplemental level of riboflavin for the ducks. Using a single factor completely randomized design, a total of 216 4-week-old Jinding laying ducks were randomly allotted to 6 groups with 6 replicates per group and 6 ducks in each replicate. Ducks in control group were fed a basal diet, and the others in experimental groups were fed the basal diet supplemented with 4, 6, 10, 20 and 50 mg/kg riboflavin, respectively. The experiment lasted for 7 weeks. The results showed as follows: 1) compared with the control group, supplementation of 10 mg/kg riboflavin improved average daily gain, and reduced the ratio of feed to gain of laying ducks (P<0.05). 2) The serum growth hormone level in 10 and 20 mg/kg riboflavin groups was significantly higher than that in the control group. There were no significant differences in serum T3 and T4 levels among all the groups (P>0.05), but with a kickpoint at 10 mg/kg riboflavin, it showed a trend to first increase and then decrease. 3) The spleen index and bursa of Fabricius index in 10 and 20 mg/kg riboflavin groups were significantly higher than those in the control group (P<0.05), and there were no significant differences in thymus index among all the groups (P>0.05), and the thymus index in 10 mg/kg riboflavin group had the highest value. In conclusion, supplementation of 10 mg/kg riboflavin in diets can improve the performance, adjust hormone metabolism and promote immune organ development of caged growing laying ducks.
HUO Siyuan, WANG An, FENG Jing
. Effects of Riboflavin on Performance, Hormone Secretion and Immune Organ Development of Caged Growing Laying Ducks[J]. Chinese Journal of Animal Nutrition, 2011
, 23(11)
: 1906
-1911
.
DOI: 10.3969/j.issn.1006-267x.2011.11.009
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