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Effects of Chronic Heat Exposure on Fat Deposition and Fat Metabolism in Male and Female Beijing-You Chickens

Author: HaoZuoYu
Tutor: LuQingPing
School: Chinese Academy of Agricultural Sciences
Course: Animal Nutrition and Feed Science
Keywords: Growth Performance Meat quality traits Fat deposition Fat metabolism Heat exposure Beijing fatty chicken
CLC: S831
Type: Master's thesis
Year: 2011
Downloads: 72
Quote: 1
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Abstract

In this experiment, artificial environmental control cabin analog sustained a constant high temperature and high-temperature research different gender Beijing fatty chicken growth performance, meat quality traits and fat deposition and formation mechanism of, on the one hand, research in this area to fill the gaps, on the other hand, of thermal stress cultivation of varieties to provide a reference. Test a single factor completely randomized design, choosing a healthy body condition similar to 49-day-old Beijing chicken male and female 72 (rooster average weight of 608.58 ± 13.07 g; hen the average weight of 518.50 ± 8.33 g) were randomly divided into two treatment : (1) high-temperature group, 35 ± 0.37 ° C; (2) optimum temperature group, 25 ± 0.38 ° C, respectively, reared on two artificial environment and climate compartment. Each treatment six replicates of 6 chickens. The trial lasted 23 days. , Respectively, in the test section 12d, 23d slaughter sampling, determination of fat deposition, blood lipids flow factor concentration of fat cells, fat metabolism activity and related gene mRNA expression levels. The results are as follows: 1, sustained high temperatures of different gender Beijing fatty chicken growth performance, carcass traits and meat quality traits 1-11 d) heat exposure in male and female daily gain were significantly lower (P lt; 0.01) feed to gain ratio no significant change (P gt; 0.05) A significant reduction in 12-22d cock ADG (P lt; 0.01), feed conversion ratio significantly increased (P lt; 0.01), hen no significant change (P gt; 0.05); 2) exposure to heat 12 days hen leg when the rooster carcass rate, leg ratio and optimum temperature group showed no significant difference (P GT; 0.05), exposure to heat 23 days significantly increased (P lt; 0.05); thermal exposure 12 d ratio was significantly lower (P lt; 0.05), exposure to heat 23 d and optimum temperature group showed no significant difference (P gt; 0.05); 3) compared with the optimum temperature, high temperature group each gender Beijing oil chicken breast muscle pH, drip loss did not change significantly (P gt; 0.05), although the pectoral muscle fat oxidation products MDA and protein oxidation products of carbonyl value increased to varying degrees, but did not reach a significant level (P gt; 0.05). 2, sustained high temperatures of different gender Beijing fatty chicken fat deposition and fat metabolism) cock: heat exposure 12 d abdominal fat, muscle than fat and subcutaneous fat deposition rate and optimum temperature group were not significantly different (P gt; 0.05) Various parts of fat deposition heat exposure 23 d were significantly lower (P lt; 0.01); abdominal fat hen: heat exposure 12 d intramuscular fat deposition rate significantly lower (P lt; 0.05). Heat exposure 23 d subcutaneous fat was significantly lower (P lt; 0.05), abdominal fat, compared to intramuscular fat deposition rate and optimum temperature group were not significantly different (P gt; 0.05); 2) cock: hot serum insulin (INS) when exposed to 12 days was significantly increased (P lt; 0.01), plasma triglyceride (TG) was significantly decreased (P lt; 0.01). Heat exposure 23d plasma INS, TG was significantly decreased (P lt; 0.01), plasma glucose (G) content was significantly higher (P lt; 0.01); hen: heat exposure 12 d plasma TG, free fatty acids (FFA) was significantly decreased (P lt; 0.05), plasma very low density lipoprotein (VLDL) levels decreased (P = 0.07). Heat exposure 23 d plasma TG, FFA no significant change (P gt; 0.05), plasma VLDL increasing trend (P = 0.065), plasma G was significantly higher (P lt; 0.01); 3) exposure to heat 12 days public fat hen muscle lipoprotein lipase (LPL) activity was significantly lower (P lt; 0.05), heat exposure 23 d fat cock muscle LPL activity was significantly decreased (P lt; 0.05), hen no significant change (P gt; 0.05); 4) in male and female plasma adiponectin (ADP), resistin (RES) level at high temperatures, no significant change (P GT; 0.05); the heat exposure 12d cock plasma leptin (LEP) levels were significantly lower (P lt; 0.01), hen was significantly higher (P lt; 0.05); 5) heat exposure 12 d hen's abdominal fat LPL gene expression was significantly lower (P lt; 0.05) heat exposure 23 d was significantly higher (P lt; 0.01). Heat exposure 12 d cock abdominal fat VLDLR gene expression was significantly lower (P lt; 0.05), no significant changes in the thermal exposure 23 d (P gt; 0.05). The results of this study show that: (1) the impact of sustained high temperatures on Beijing oil chicken growth performance varies because of their sex. Early exposure to heat, the Gender oil chicken daily gain are subject to high temperature reduced; prolonged heat exposure, cock daily gain by the greater decline in the influence of high temperature, hens affected eased. (2) With the heat exposure time, the hen fat deposition decreased eased, cock fat deposition gradually decreased. (3) With the heat exposure time, hen blood flow, lipids, adipose tissue LPL activity and gene expression affected by high temperature decreased level decreases, the cock fat tissue LPL activity and plasma TG levels fall greater. (4) adipose tissue LPL activity and its gene expression, blood FFA, TG, VLDL content can be used as the main indicators of high temperature broiler fat metabolism.

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