Amino Acid Balance Pattern of a Low Protein Diet in Fast-Growing Yellow-Feathered Broilers Aged from 1 to 21 Days

LIN Xiajing, JIANG Shouqun, DING Fayuan, ZHENG Chuntian, HONG Ping

doi:10.3969/j.issn.1006-267x.2014.09.014

Chinese Journal of Animal Nutrition >

2014 , Vol. 26 >Issue 9: 2542 - 2552

DOI: https://doi.org/10.3969/j.issn.1006-267x.2014.09.014

Poultry Nutrition

Amino Acid Balance Pattern of a Low Protein Diet in Fast-Growing Yellow-Feathered Broilers Aged from 1 to 21 Days

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State Key Laboratory of Livestock and Poultry Breeding, Key Laboratory of Animal Nutrition and Feed Science (South China) of Ministry of Agriculture, Guangdong Public Laboratory of Animal Breeding and Nutrition, Guangdong Key Laboratory of Animal Breeding and Nutrition, Institute of Animal Science, Guangdong Academy of Agricultural Sciences, Guangdong 510640, China

Received date: 2014-03-18

Online published: 2014-09-10

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Abstract

This experiment was conducted to investigate the effects of amino acid balance pattern of a low protein diet on performance, nitrogen use efficiency and blood biochemical indexes of fast-growing yellow-feathered broilers aged from 1 to 21 days. A total of 252 one-day-old fast-growing yellow-feathered broilers were randomly allocated into 7 dietary groups with 6 replicates per group and with 6 birds per replicate, and were fed for 21 d. The control diet was formulated on the basis of the crude protein and amino acid requirements for these chickens, and the low protein (LP) diet had 3% less crude protein content, but was supplemented with essential amino acids (Lys, Met, Thr, Trp and Ile) to the contents in control. In groups LP-Lys, LP-Met, LP-Trp, LP-Thr and LP-Ile, the dietary content of these individual amino acid was supplemented to just 80% of control diet, while all other amino acids remained as in the LP diet. The results showed as follows: 1) there were no significant differences between control group and other groups in average daily gain, average daily feed intake and feed/gain (P>0.05), but the average daily gain of LP-Lys group was the highest and its feed/gain was the lowest. 2) The plasma total plasma protein content of groups LP-Met and LP-Trp was significantly lower than that of the control group (P<0.05). The plasma albumin content of LP-Met group was significantly lower than that of groups control, LP, LP-Lys, LP-Thr and LP-Ile (P<0.05). The plasma urea nitrogen content of groups LP-Trp and LP-Ile was significantly higher than that of groups control and LP-Lys (P<0.05). 3) The fecal nitrogen content of control group was significantly higher than that of all other groups (P<0.05). The nitrogen retention of control group was significantly lower than that of LP-Lys group (P<0.05). 4) The retentions of Lys, Ile, Phe, and Val of control group were significantly lower than those of all other groups (P<0.05). The retentions of Met and Arg of control group were significantly lower than those of LP-Ile group (P<0.05). The retentions of Thr, Leu and Tyr of control group were significantly lower than those of groups LP, LP-Lys, LP-Trp, LP-Thr and LP-Ile (P<0.05). On the basis of all criteria considered, the optimal Lys : Met : Trp : Thr : Ile for fast-growing yellow-feathered broilers aged from 1 to 21 days is 100 : (44 to 55) : 72 : (18 to 23) : (54 to 72).

Key words： yellow-feathered broiler; amino acid balance pattern; low protein diet; lysine; nitrogen retention

Cite this article

LIN Xiajing, JIANG Shouqun, DING Fayuan, ZHENG Chuntian, HONG Ping . Amino Acid Balance Pattern of a Low Protein Diet in Fast-Growing Yellow-Feathered Broilers Aged from 1 to 21 Days[J]. Chinese Journal of Animal Nutrition, 2014 , 26(9) : 2542 -2552 . DOI: 10.3969/j.issn.1006-267x.2014.09.014

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