Effects of Balancing Rice Bran Based Diets for Up to Four Amino Acids on Growth Performance of Broilers

Mkdk Piyaratne,Nsbm Atapattu,Aps Mendis,Agc Amarasinghe

doi:10.4038/tare.v12i2.2790

Mkdk Piyaratne, Nsbm Atapattu + Show 2 more

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https://doi.org/10.4038/tare.v12i2.2790

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Abstract

Objective of this study was to determine whether the adverse effects associated with high dietary rice bran (RB) inclusion levels in broiler diets could be corrected by balancing diets for higher number of amino acids (AA). The experiment followed a completely randomize design in 2x4 factorial arrange-ment. Eight experimental diets were formulated using linear model based computer software (CUFATotal Feed). Treatment factors were two dietary RB levels (20 and 40%) and four levels of AA considerations in ration formulation (1. lysine and methionine, 2. 1 + isoleucine, 3. 2 + valine, 4. 3 + threonine). When rations were balanced for lysine and methionine, many of the other AAs were in ex-cess. No practical ration could be formulated to meet the threoine requirement. Twenty-two-day old broiler chicks (n=144) were allocated into 48 pens and fed one of the eight experimental diets ad libitum from 23-43 days. Balancing the diets for higher number of AAs had no significant effect on any of the growth performance parameters. Live weight on day 43, weight gain from day 23-43 and feed intake and the tibia ash contents of the broiler fed 40% dietary RB were significantly lower than those of 20% RB fed counterparts. However, feed conversion ratios were not significantly different between the birds fed two dietary RB levels. Interaction between RB levels and the number of AAs considered in ration formulation was not significantly different with respect to any of the growth parameters measured. It was concluded that balancing rations for up to four amino acids; lysine, methionine, isoleucine and va-line did not mitigate the adverse effects of 40% dietary RB in broiler growth performance. Key words: Amino acids; Broiler performance; Rice bran DOI: 10.4038/tare.v12i2.2790 Tropical Agricultural Research & Extension 12(2): 2009 pp.57-61

Highlights

Rice bran is one of the major ingredients used in poultry feed formulations
Apart from lysine and methionine, other amino acids (AA) such as isoleucine, valine and threonine are low in rice bran (RB)
It is hypothesized that balancing of diets for more AAs namely lysine, methionine, isoleucine, valine and theronine would mitigate the adverse affects of higher RB inclusion levels on growth performance of broiler chicken

Summary

Introduction

Rice bran is one of the major ingredients used in poultry feed formulations. Even though the in vitro nutritive value of RB is comparable with other cereals and their by-products, its in vivo nutritive value is inferior, mainly due to the presence of a range of anti-nutrients such as phytate, fibre, lipases and anti-proteolytic substances. As the RB is cheap and locally available, the price of poultry feed can be reduced substantially if higher RB levels can be included in poultry diets. In ration formulation, only the lysine and methionine is considered. As protein value of RB is low due to the presence of phytase, fibre and antiproteolytic substances (Selle et al 2000), other amino acids can be limiting, when higher levels of RB are included in poultry diets. Apart from lysine and methionine, other AAs such as isoleucine, valine and threonine are low in RB. It is hypothesized that balancing of diets for more AAs namely lysine, methionine, isoleucine, valine and theronine would mitigate the adverse affects of higher RB inclusion levels on growth performance of broiler chicken.

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