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| Author(s): |
João Guilherme Ferreira
Total Authors: 1
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| Document type: | Master's Dissertation |
| Press: | Pirassununga. |
| Institution: | Universidade de São Paulo (USP). Faculdade de Medicina Veterinária e Zootecnia (FMVZ/SBD) |
| Defense date: | 2012-06-19 |
| Examining board members: |
Ricardo de Albuquerque;
José Roberto Sartori;
Messias Alves da Trindade Neto
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| Advisor: | Ricardo de Albuquerque |
| Abstract | |
Was evaluated at different levels of crude protein for female turkeys, using 576 birds from zero to 84 days (Experiment I), 550 birds 28-56 days (Experiment II) and from 57 to 550 birds 84 days (Experiment III). The experimental design was completely randomized with six treatments and six repetitions. In three experiments, the diets were isocaloric treatments, being based on corn and soybean meal supplementation of amino acids were supplemented when necessary. In Experiment I, the initial treatment received corresponding to levels 23, 24, 25, 26, 27 and 28% CP in diets with 3020 kcal / kg. In the next two phases (phase of compensatory growth) diets were 26 and 23% CP and 3100 and 3250 / kg for the grower and finisher phases, respectively. In Experiment II, the treatments were to levels 21, 22, 23, 24, 25 and 26% CP in diets with 3,100 / kg. In Experiment III, levels for the treatments were: 17, 18, 19, 20, 21 and 22% CP with 3,250 / kg. The parameters evaluated were weight gain, feed intake, feed conversion, composition and body nutrient deposition, and the final stage (the first and third experiment) the characteristics and yield of the carcass. In the initial phase of Experiment I, the levels of dietary CP influenced feed intake, CP intake and nitrogen excretion, we noted the response (P <0.001) increased linearly. Effect was observed (P <0.01) quadratic for body weight and weight gain. Of chemical components, expressed in percentage in the carcass was no response (P <0.001) quadratic for all variables. In later stages there was no answer for any variable, observing an effect of compensatory growth, leading to a protein in the initial phase. In Experiment II, there was a linear correlation for the variables of body weight, feed intake, weight gain, protein deposition and water. The remaining variables showed no significant response (P> 0.05), the level of 26% was established as a better standard for performance and nutrient deposition at this stage. Responses were found in performance, nitrogen excretion and composition in experiment III, only the viability was not affected by CP level, all other variables had decreased linearly (P <0.05). Variables of income for the slaughter, linear response to the carcass (P <0.01) and quadratic for breast meat yield and breast without skin and bone, allowing a reduction to 17% CP in the finals. This information obtained from the three experiments confirm that the reduction of CP can be done without sacrificing performance and protein deposition, reducing nitrogen excretion. (AU) | |
| FAPESP's process: | 10/04668-8 - Protein ideal for cutting female turkeys |
| Grantee: | João Guilherme Ferreira |
| Support Opportunities: | Scholarships in Brazil - Master |