Joint Animal Science Meetings (ADSA, PSA, AMPA, CSAS, WSASAS, ASAS) , 2010-07-11

Title : ( Response surface model for broiler chickens performance fed diets varying in digestible protein and amino acids )

Authors: Hamed Ahmadi , Abolghasem Golian ,

Citation: BibTeX | EndNote

Abstract

Response surface methodology (RSM) and 5-level-4-factor central composite design (CCD) were used to evaluate the response of broilers (BWG and FCR) to dietary digestible protein (dP), lysine (dLys), methionine+cysteine (dTSAA), and threonine (dThr). Eighty 4 cages of 5 birds each were assigned to feed diets contained 5 levels of dP (18, 19, 20, 21 and 22%), dLys (1.06, 1.12, 1.18, 1.24 and 1.30%), dTSAA (0.81 to 0.86, 0.91, 0.96 and 1.01%), and dThr (0.66, 0.71, 0.76, 0.81 and 0.86%) from 11 to 17 d of age. Diets were prepared using corn, soybean meal (45.2% CP), and corn gluten meal (48.6% CP). Protein and amino acid analyses were performed for these ingredients. All diets were formulated to have 3050 kcal/kg. The experimental results of CCD were fitted with the second-order polynomial equation. A ridge analysis was utilized to compute the optimum response for maximizing BWG and minimizing FCR. The fitted second-order polynomial equations for BWG and FCR are produced as follows: BWG (g/bird/d) = 1222.2 −76.7 dP −2.4 dP2 −1468.0 dLys −260.0 dLys2 +675.2 dTSAA −522.0 dTSAA2+ 404.0 dThr −793.5 dThr2 +77.6 dP*dLys +41.6 dP*dTSAA +51.5 dP*dThr +145.8 dLys*dTSAA +556.5 dLys*dThr −958.3 dTSAA*dThr; R 2 = 0.70; Root MS error = 4.97. FCR = −124.3 +12.8 dP +0.2 dP2 +70.8 dLys +44.7 dLys2 −86.5 dTSAA +60.8 dTSAA2 −18.6 dThr +64.3 dThr2 −9.7 dP*dLys −4.5 dP*dTSAA −4.0 dP*dThr +34.3 dLys*dTSAA −24.8 dLys*dThr +34.3 dTSAA*dThr; R2 = 0.71; Root MS error = 0.53. The ridge max analysis on BWG and ridge min analysis on FCR models revealed that the maximum BWG may be obtained with dP 18.5%, dLys 1.10, dTSAA 0.89, and dThr 0.73 and minimum FCR may be obtained with dP 19.44%, dLys 1.18, dTSAA 0.90, and dThr 0.75. At the optimum point, the predicted BWG and FCR were 40.2 g/bird/d and 1.09, respectively. The combination of CCD and RSM techniques consider simultaneously all investigating factors and their possible interactions. Thus, it appears that the platform may be used to describe relationship between dietary concentration of nutrients and broiler performance to achieve optimal target.

Keywords

, response surface model, digestible protein and amino acid, broiler chicken
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@inproceedings{paperid:1017148,
author = {Ahmadi, Hamed and Golian, Abolghasem},
title = {Response surface model for broiler chickens performance fed diets varying in digestible protein and amino acids},
booktitle = {Joint Animal Science Meetings (ADSA, PSA, AMPA, CSAS, WSASAS, ASAS)},
year = {2010},
location = {دنور, USA},
keywords = {response surface model; digestible protein and amino acid; broiler chicken},
}

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%0 Conference Proceedings
%T Response surface model for broiler chickens performance fed diets varying in digestible protein and amino acids
%A Ahmadi, Hamed
%A Golian, Abolghasem
%J Joint Animal Science Meetings (ADSA, PSA, AMPA, CSAS, WSASAS, ASAS)
%D 2010

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