| Grant number: | 11/16238-0 |
| Support Opportunities: | Scholarships in Brazil - Master |
| Start date: | March 01, 2012 |
| End date: | December 31, 2013 |
| Field of knowledge: | Agronomical Sciences - Animal Husbandry - Animal Production |
| Principal Investigator: | Isabel Cristina Boleli |
| Grantee: | Vitor Rosa de Almeida |
| Host Institution: | Faculdade de Ciências Agrárias e Veterinárias (FCAV). Universidade Estadual Paulista (UNESP). Campus de Jaboticabal. Jaboticabal , SP, Brazil |
Abstract The management of the incubation temperature is important for quality of the chicks at hatching and for their postnatal development and later performance. The objective of this study is to evaluate the effect of incubation temperature on thermal preference and thermotolerance of male broilers and the interference of both temperatures on fat deposition and performance. This study will be divided in three experiments. Exp 1: fertile eggs of broiler (Cobb ®) will be distributed in six incubators at 37.5 °C until the 12th day of incubation. From day 13, they will be divided into three treatments (36 °C, 37.5 °C and 39 °C) until hatching. It will be evaluated parameters of incubation (egg mass loss, eggshell temperature, conductivity, thickness and porosity, length of incubation period) well as liver ( total colesterol, lipid and glycogen), adipose tissue (hyperthrophy, hyperplasy, vassel number per adipocyte and number of macrophages) , biochemical parameters of the blood (HDL, LDL, VLDL, triglyceride, cholesterol, lipid), basal temperature, weight and composition of new-hatched chicks and the weight and composition of their yolk sacs. Exp. 2: Eggs will be incubated as described for Exp. 1. After hatching, chicks will be raised usual thermoneutral temperature for the strain and used to determine one their zone of thermoneutrality in different ages during growth. In the third experiment, the eggs will incubated as described in Exp 1. After hatching, male chicks from each incubation temperature will be raised until 42 days old in environmental chambers maintained under three different temperatures: thermoneutral advocated for the line, temperature established in the test of thermal preference according to incubation temperature (PTI) and hot temperature compared to PTI. The PTI will be determined on the Exp 2. Eight replicates of 25 birds / incubation temperature / temperature setting will be used. Adipose tissue (hypertrophy and hyperplasy, vessel number per adipocyte, number of macrophages), liver (total cholesterol, lipid and glycogen), body weight and composition, blood parameters (lipoproteins, total cholesterol, triglyceride, lipid and glucose), body temperature and performance will be evaluated. The data will be evaluated by the procedure of SAS ® (SAS Institute, 2002). | |
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