Molecular Nutrition

Effects of Dietary Threonine Level on Growth Performance, Carcass Traits, Immune Function and Serum Hormone of Peking Ducklings

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  • State Key Laboratory of Animal Nutrition, Institute of Animal Sciences, Chinese Academy of Agricultural Sciences, Beijing 100193, China

Received date: 2016-12-01

  Online published: 2017-06-07

Abstract

This experiment was conducted to investigate the effects of dietary threonine (Thr) level on growth performance, carcass traits, immune function and serum hormone of Peking ducklings. Three hundred and twenty 1-day-old healthy Peking ducks were randomly allocated to 5 groups with 8 replicates per group and 8 ducklings per replicate. The measured values of dietary Thr level in 5 groups were 0.65% (control), 0.69%, 0.81%, 0.88% and 0.98%, respectively. The experiment lasted for 21 days. The results showed as follows:1) dietary Thr level had significant effects on average daily gain (ADG) and average daily feed intake (ADFI) of ducklings (P<0.01), the ADG and ADFI of ducklings in control group were significantly lower than those in other groups (P<0.05). 2) Dietary Thr level had significant effect on breast meat rate of ducklings (P<0.05), the breast meat rate of ducklings in control group was significantly lower than that in 0.69%, 0.81% and 0.88% groups (P<0.05). 3) Dietary Thr level had no significant effect on Bursa of Fabricius index, spleen index and thymus index of ducklings (P>0.05). Dietary Thr level had significant effects on Bursa of Fabricius weight and thymus weight of ducklings (P<0.01), the Bursa of Fabricius weight of ducklings in control group was significantly lower than that in other groups (P<0.05), and the thymus weight of ducklings in control group was significantly lower than that in 0.81% and 0.88% groups (P<0.05). 4) Dietary Thr level had significant effect on serum triiodothyronine (T3) content of ducklings (P<0.05), the serum T3 content in 0.81% group was the highest and significantly higher than that in control group and 0.98% group (P<0.05). 5) The Thr requirements showed the quadratic relationships with ADG, ADFI and breast meat rate, the Thr requirements of ducklings were 0.860%, 0.852% and 0.837%, respectively, when the ADG, ADFI and breast meat rate got the max values. The results suggest that dietary supplemented with suitable Thr level can improve the growth performance, carcass traits and immune function of Peking ducklings.

Cite this article

BI Ye, XIN Hairui, PAN Xiaohua, XIONG Benhai . Effects of Dietary Threonine Level on Growth Performance, Carcass Traits, Immune Function and Serum Hormone of Peking Ducklings[J]. Chinese Journal of Animal Nutrition, 2017 , 29(6) : 1913 -1920 . DOI: 10.3969/j.issn.1006-267x.2017.06.012

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