Comparison of Standardized Ileal Amino Acid Digestibility of Four Plant-Based Protein Feedstuffs for Broiler Chickens at Different Ages

LEI Ting; GUO Yuming; DU Encun; SHAO Yuxin

doi:10.3969/j.issn.1006-267x.2013.12.011

2013 , Vol. 25 >Issue 12: 2854 - 2864

DOI: https://doi.org/10.3969/j.issn.1006-267x.2013.12.011

Poultry Nutrition

Comparison of Standardized Ileal Amino Acid Digestibility of Four Plant-Based Protein Feedstuffs for Broiler Chickens at Different Ages

LEI Ting ,
GUO Yuming ,
DU Encun ,
SHAO Yuxin

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State Key Laboratory of Animal Nutrition, College of Animal Science and Technology, China Agricultural University, Beijing 100193, China

Received date: 2013-07-22

Online published: 2013-11-19

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Abstract

This experiment was conducted to study the standardized ileal amino acid digestibility of four plant-based protein feedstuffs for broiler chickens at different ages. In experiment 1, a total of 540 1-day-old Cobb 500 broilers were randomly divided into 5 treatments with 6 replicates each (n=18). Four of those treatments were fed soybean meal diet, rapeseed meal diet, corn gluten meal diet, and corn distillers dried grains with solubles (DDGS) diet, respectively, and another treatment was fed a N-free diet. All of the diets were semi-purified and formulated with 0.5% titanium dioxide as an exogenous indicator. Endogenous amino acid losses were determined by N-free diet method, and the standardized ileal amino acid digestibility of soybean meal, rapeseed meal, corn gluten meal, and corn DDGS for broiler chickens at 14 and 35 days of age were determined. In experiment 2, a total of 360 1-day-old Ross 308 broilers were randomly divided into 3 treatments with 6 replicates each (n=20). Two of those treatments were fed soybean meal diet and rapeseed meal diet, respectively, and another treatment was fed the N-free diet. The same method was used to determine the standardized ileal amino acid digestibility of soybean meal and rapeseed meal. The results showed that most of the standardized ileal amino acid digestibility of the four feedstuffs for the 2 breed broilers at 14 days of age were significantly higher than those at 35 days of age (P<0.05); the relative weight of small intestine of Ross 308 broilers at 14 days of age was significantly higher than that at 35 days of age (P<0.05); compared with 35 days of age, the higher activities of trypsin and chymotrypsin were numerically observed at 14 days of age, but the difference was not significant (P>0.05). In conclusion, at 14 days of age, the digestive organs of broiler chickens may have been mature enough to utilize the proteins. The higher relative weight of small intestine and enzyme activity in jejunal digesta may explain the higher standardized ileal amino acid digestibility of broiler chickens at 14 days of age rather than 35 days of age.

Key words： broiler; age; ileum; amino acids; digestibility

Cite this article

LEI Ting , GUO Yuming , DU Encun , SHAO Yuxin . Comparison of Standardized Ileal Amino Acid Digestibility of Four Plant-Based Protein Feedstuffs for Broiler Chickens at Different Ages[J]. Chinese Journal of Animal Nutrition, 2013 , 25(12) : 2854 -2864 . DOI: 10.3969/j.issn.1006-267x.2013.12.011

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