Effects of Dietary Amino Acid Levels on Growth Performance, Serum Biochemical Parameters and Amino Acid Concentrations of Prepubertal Gilts in Growing Phase

DONG Zhiyan, FANG Guiyou, LIU Yaxuan, LIU Jing, MIAO Furong, YE Dingcheng, LIN Changguang

doi:10.3969/j.issn.1006-267x.2015.05.005

2015 , Vol. 27 >Issue 5: 1361 - 1369

DOI: https://doi.org/10.3969/j.issn.1006-267x.2015.05.005

Swine Nutrition

Effects of Dietary Amino Acid Levels on Growth Performance, Serum Biochemical Parameters and Amino Acid Concentrations of Prepubertal Gilts in Growing Phase

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1. Institute of Animal Husbandry and Veterinary Medicine, Fujian Academy of Agriculture Sciences, Fuzhou 350013, China;
2. Fujian Guanghua Best Eco-Agriculture Development Co. Ltd., Fuzhou 350003, China

Received date: 2014-11-05

Online published: 2015-05-13

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Abstract

This study was conducted to evaluate the effects of different dietary amino acid levels on the growth performance, serum biochemical parameters and amino acid concentrations of prepubertal gilts in growing phase based on ideal amino acid pattern. A total of one hundred and twenty two-line crossbred (landrace × large white), with (19.00±1.50) kg of average body weight and similar body conditions, were allocated to four groups with three replicates per group and ten gilts per replicate. The corn-soybean meal diets with four different digestible lysine levels were used respectively and the same digestible amino acid pattern (digestible lysine:digestible sulphur amino acids:digestible threonine:digestible tryptophane=100:60:65:18) by adding synthetic amino acids for the early (20 to 40 kg) and late (40 to 70 kg) growing phases. In 20 to 40 kg phase, the gilts were fed with four diets with different digestible lysine levels of 0.78% (group 1), 0.83% (group 2), 0.88% (group 3) and 0.93% (group 4). In 40 to 70 kg phase, the gilts were fed with another four diets with different digestible lysine levels of 0.68% (group 1), 0.73% (group 2), 0.78% (group 3) and 0.83% (group 4). The results showed as follows: at phase of 20 to 40 kg, average daily gain (ADG) (569.69 g) of prepubertal gilts was the highest and feed/gain (F/G) (2.24) was the lowest in group 2 (P<0.05). The concentration of serum urea nitrogen (UN) in group 2 was significantly lower than that in groups 3 and 4 (P<0.05), and there was no significant difference with that in group 1 (P>0.05). The concentration of insulin-like growth factor Ⅰ (IGF-Ⅰ) in group 2 was significantly higher than that in groups 3 and 4 (P<0.05), and there was no significant difference than that in group 1 (P>0.05). The concentrations of serum lysine, threonine in group 2 were significantly lower than those in groups 3 and 4 (P<0.05), the concentrations of serum leucine, isoleucine, phenylalanine and valine in group 2 were significantly lower than those in groups 3 and 4 (P<0.05). At phase of 40 to 70 kg, the ADG (787.43 g) was the highest and F/G (2.55) was the lowest in group 3 (P<0.05). The concentration of serum UN in group 3 was significantly lower than that in the other groups (P<0.05), and the concentration of IGF-Ⅰ was no significant difference among the groups (P>0.05). The concentrations of serum lysine, threonine in group 3 were significantly lower than those in groups 1 and 2 (P<0.05). In conclusion, the optimum level of DLys in gilts weighting 20 to 40 kg and 40 to 70 kg based on this experiment were 0.85% and 0.78%, or 0.61 and 0.57 g/MJ as expressed with digestive energy (DE), respectively.

Key words： digestible lysine; growth performance; serum biochemical parameters; amino acid concentrations; prepubertal gilts in growing phase

Cite this article

DONG Zhiyan, FANG Guiyou, LIU Yaxuan, LIU Jing, MIAO Furong, YE Dingcheng, LIN Changguang . Effects of Dietary Amino Acid Levels on Growth Performance, Serum Biochemical Parameters and Amino Acid Concentrations of Prepubertal Gilts in Growing Phase[J]. Chinese Journal of Animal Nutrition, 2015 , 27(5) : 1361 -1369 . DOI: 10.3969/j.issn.1006-267x.2015.05.005

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