Effects of Dietary Tryptophan Level on Performance and Serum Biochemical Indices of Growing Meat Rabbits

WANG Tao, JIA Gang, LEI Huaigang, LI Rui, WANG Kangning

doi:10.3969/j.issn.1006-267x.2014.08.020

Chinese Journal of Animal Nutrition >

2014 , Vol. 26 >Issue 8: 2176 - 2183

DOI: https://doi.org/10.3969/j.issn.1006-267x.2014.08.020

Ruminants and Herbivorous Animal Nutrition

Effects of Dietary Tryptophan Level on Performance and Serum Biochemical Indices of Growing Meat Rabbits

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1. Animal Nutrition Institute, Sichuan Agricultural University, Ya'an 625014, China;
2. College of Animal Science and Technology, Sichuan Agricultural University, Ya'an 625014, China;
3. Guangyuan Animal Husbandry Bureau in Sichuan Province, Guangyuan 628000, China

Received date: 2014-03-19

Online published: 2014-08-13

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Abstract

This experiment was conducted to study the effects of dietary tryptophan level on performance and serum biochemical indices of growing meat rabbits in a certain level of digestible energy, in order to determine the appropriate level of dietary tryptophan. A total of 112 healthy New Zealand growing meat rabbits with an average body weight of (1 099.14±54.01) g were randomly assigned to 8 groups with 7 replicates per group and 2 rabbits per replicate. Rabbits in the 8 groups were fed experimental diets containing 0.165%, 0.175%, 0.185%, 0.195%, 0.205%, 0.215%, 0.225% and 0.235% tryptophan, respectively. The experiment lasted for 7 days for adaptation and 28 days for test. The results showed as follows: 1) dietary tryptophan level had significant influences on average daily feed intake (ADFI) and feed/gain (F/G) (P<0.05), and had a extremely significant influence on average daily gain (ADG) of growing meat rabbits (P<0.01). The ADFI and ADG had the maximum values and the F/G had the minimum value in the group with the diet containing 0.205% tryptophan. 2) Dietary tryptophan level had extremely significant influences on serum urea nitrogen and insilin-like growth factor-Ⅰ contents of growing meat rabbits (P<0.01). The serum urea nitrogen content had the minimum value and the serum insulin-like growth factor-Ⅰ content had the maximum value in the group with the diet containing 0.205% tryptophan. The contents of total protein and albumin in serum of growing meat rabbits were not significantly affected by dietary tryptophan level (P>0.05). Considering all indices of this experiment, when digestible energy level is 10.48 MJ/kg in the diet, the appropriate level of dietary tryptophan of growing meat rabbits is 0.205% (measured value is 0.196%).

Key words： growing meat rabbit; tryptophan; requirement; digestible energy; performance; serum biochemical indices

Cite this article

WANG Tao, JIA Gang, LEI Huaigang, LI Rui, WANG Kangning . Effects of Dietary Tryptophan Level on Performance and Serum Biochemical Indices of Growing Meat Rabbits[J]. Chinese Journal of Animal Nutrition, 2014 , 26(8) : 2176 -2183 . DOI: 10.3969/j.issn.1006-267x.2014.08.020

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