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| Author(s): |
Leonardo Tedeschi
Total Authors: 1
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| Document type: | Master's Dissertation |
| Press: | Ilha Solteira. 2016-05-03. |
| Institution: | Universidade Estadual Paulista (Unesp). Faculdade de Engenharia. Ilha Solteira |
| Defense date: | 2016-03-03 |
| Advisor: | Rosemeire da Silva Filardi; Glaucia Amorim Faria |
| Abstract | |
The objective of this study was to evaluate the technical and economic viability of using different forms of calculation and electrolyte balance in feed formulation for laying hens in the second production cycle. They were used 216 light commercial layers, Lohmann, second production cycle, distributed in a completely randomized design in a factorial scheme (2 x 4 + 1) with split-plot in time. Two calculation formulas of Electrolyte Balance (Mongin = [Na+ + K +] - [Cl] and Ender = [Na+ + K+] - [Cl- + S2-]) and four Electrolyte balance values (170, 220, 270 and 320 mEq.kg-1) and a control diet (no formula or value for electrolyte balance) for a total of nine treatments with four replicates of six birds each, divided into four cycles, each cycle consisted of 28 days. Performance parameters were analyzed for hens, egg quality and egg quality in shelf life. The differences between the treatments comprise the formulas and electrolyte balance and the witness were inconsistent about the performance or quality of the egg compared to a formulated diet without this concept, but the combination of Ender's formula and electrolyte balance 270 mEq.kg-1 determined a higher economic return. In Mongin’s formula the electrolyte balance determined a quadratic behavior for feed intake, egg mass, Haugh unit of fresh and stored eggs, indicating better results in the range of 241.84 mEq.kg-1, but electrolyte balance 170 mEq.kg-1 promoteted the quality of fresh or stored eggs. To Ender's formula, the increase in electrolyte balance determined linear decrease in feed intake, production and mass of the egg and linear increase in the Haugh unit of fresh and stored eggs. In the electrolyte balance of 270 mEq.kg-1 the use of Ender's formula proved to be efficient, providing better feed conversion ratio and higher specific gravity, in addition to providing greater economic return. The increase in electrolyte balance levels promoted increased excretion of water and potassium. (AU) | |
| FAPESP's process: | 14/12820-5 - Technical and economic viability of incorporation of the electrolyte balance in diet formulation for laying hens at second cycle of production |
| Grantee: | Leonardo Tedeschi |
| Support Opportunities: | Scholarships in Brazil - Master |