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| Author(s): |
Raquel Bighetti Araujo
Total Authors: 1
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| Document type: | Master's Dissertation |
| Press: | Pirassununga. |
| Institution: | Universidade de São Paulo (USP). Faculdade de Zootecnica e Engenharia de Alimentos (FZE/BT) |
| Defense date: | 2010-07-15 |
| Examining board members: |
Douglas Emygdio de Faria;
Marcos Barcellos Café;
César Gonçalves de Lima
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| Advisor: | Douglas Emygdio de Faria |
| Abstract | |
This study was carried out to elaborate surface response models, by using data from literature obtained through systematic review, to predict weight gain, feed intake and feed conversion according to metabolizable energy levels, slaughter age, rearing temperature and broiler chickens sex. The equations were used to develop a program in Microsoft Excel® and, with Solver tool, determine the values of the model variables that promote maximum profits and performance. After, it was carried out two experiments, the first one with males and the second one with females, to elaborate mathematical models, by using empiric data, to optimize the cost-benefit relationship and define nutritional strategies considering performance, carcass characteristics and market variables. The treatments were based on six levels of metabolizable energy correct to nitrogen balance (AMEn) in each feed phase, keeping the AMEn:nutrients relationship following Rostagno et al. (2005) recommendations. Carcass and performance characteristics were evaluated at 35, 42, 49 days of age and, after obtained the regression equations, it was elaborated an economic analysis to establish the best nutritional levels in each market situation. In conclusion, feed formulations that look for maximum performance and/or minimum cost result in different diets that those formulated to look for maximum economic outcome. The developed mathematical models, based on either data from literature or experimental data, are an important tool, because they allow prediction of variables such as weight gain, feed intake and feed conversion. Besides, they are useful to optimize profit through nutritional levels, slaughter age and rearing temperature adaptation, according to market situations and birds sex. (AU) | |
| FAPESP's process: | 08/07545-4 - Development of mathematical models involving nutrition levels, performance and carcass yield for optimization of economic results of broilers chickens |
| Grantee: | Raquel Bighetti Araujo |
| Support Opportunities: | Scholarships in Brazil - Master |