Effects of Threonine Level in a Low Protein Diet on Growth Performance and Nutrient Apparent Digestibility of Early Weaning Sika Deer

LI Rende, WANG Xiaoxu, ZHANG Tietao, ZHANG Ting, WANG Jing, ZHANG Xuelei, LI Guangyu, WANG Kaiying

doi:10.3969/j.issn.1006-267x.2017.12.047

2017 , Vol. 29 >Issue 12: 4637 - 4645

DOI: https://doi.org/10.3969/j.issn.1006-267x.2017.12.047

Molecular Nutrition

Effects of Threonine Level in a Low Protein Diet on Growth Performance and Nutrient Apparent Digestibility of Early Weaning Sika Deer

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State Key Laboratory of Special Economic Animal Molecular Biology, Institute of Special Animal and Plant Science, Chinese Academy of Agricultural Sciences, Changchun 130112, China

Received date: 2017-05-28

Online published: 2017-12-04

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Abstract

This experiment was conducted to investigate the effects of threonine (Thr) level in a low protein diet on growth performance and nutrient apparent digestibility of early weaning sika deer. Twenty-four healthy 3-month-old male sika deer were randomly divided into 4 groups with 6 deer per group. Infant deer restricted feeding 4 different diets and lysine (Lys) and methionine (Met) levels in all diets were 0.87% and 0.28%, respectively. Infant deer in high protein diet control group (groupⅠ) were fed a high protein diet with 16% protein level, and infant deer in low protein diet test groups were fed a low protein diet with 14% protein level and different levels of Thr. The Thr level in 4 diets was 0.54% (group Ⅰ), 0.46% (group Ⅱ), 0.59% (group Ⅲ), 0.72% (group Ⅳ). The pretrial period was 15 days, and the formal period was 30 days. The results showed as follows:1) the average daily gain (ADG) of high protein diet control group was extremely significantly higher than that of group Ⅱ (P<0.01), and had no significant difference compared with groups Ⅲ and Ⅳ (P>0.05). The feed/gain (F/G) of high protein diet control group was extremely significantly higher than that of groups Ⅲ and Ⅳ (P<0.01), which was extremely significantly lower than that of group Ⅱ (P<0.01). 2) The apparent digestibility of crude protein of high protein diet control group was extremely significantly lower than that of groups Ⅲ and Ⅳ (P<0.01), which was extremely significantly higher than that of group Ⅱ (P<0.01). The apparent digestibility of energy of high protein diet control group was extremely significantly lower than that of groups Ⅲ and Ⅳ (P<0.01), which had no significant difference compared with group Ⅱ (P>0.05). The apparent digestibility of calcium of group Ⅲ was significantly higher than that of group Ⅱ (P<0.01), which had no significant difference compared with other groups (P>0.05). 3) The apparent digestibility of histidine (His), aspartic acid (Asp), glutamic acid (Glu), glycine (Gly) and cysteine (Cys) of high protein diet control group was significantly higher than that of group Ⅱ (P<0.05), and the apparent digestibility of other amino acids in group Ⅱ had no significant difference (P>0.05). The apparent digestibility of Lys, Met, Thr, arginine (Arg), alanine (Ala) and tyrosine (Tyr) of high protein diet control group was extremely significantly lower than that of group Ⅲ (P<0.01), and the apparent digestibility of valine (Val), leucine (Leu), phenylalanine (Phe) and serine (Ser) was significantly lower than that of group Ⅲ (P<0.05). The apparent digestibility of Ala of high protein diet control group was extremely significantly lower than that of group Ⅳ (P<0.01) and the apparent digestibility of Lys, Thr, Val and Ala was significantly lower than that of group Ⅳ (P<0.05), but it was no significant difference in the apparent digestibility of other amino acids (P>0.05). It can be seen that the appropriate threonine level in the low protein diet can promote the growth and nutrient digestion and utilization of early weaning sika deer. Under the same dietary Lys and Met levels, the growth performance and nutrient apparent digestibility of sika deer fed 0.59% Thr low protein diet with protein level of 14% are better than those fed high protein diet with protein level of 16%.

Key words： sika deer; threonine; growth performance; low protein diet

Cite this article

LI Rende, WANG Xiaoxu, ZHANG Tietao, ZHANG Ting, WANG Jing, ZHANG Xuelei, LI Guangyu, WANG Kaiying . Effects of Threonine Level in a Low Protein Diet on Growth Performance and Nutrient Apparent Digestibility of Early Weaning Sika Deer[J]. Chinese Journal of Animal Nutrition, 2017 , 29(12) : 4637 -4645 . DOI: 10.3969/j.issn.1006-267x.2017.12.047

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