Association of growth rate with hormone levels and myogenic gene expression profile in broilers

文献类型： 外文期刊

第一作者： Xiao, Yingping

作者： Xiao, Yingping;Li, Kaifeng;Gui, Guohong;Yang, Hua;Wu, Choufei;Zhang, Guolong

作者机构：

关键词： Breast muscle;Broiler;Growth performance;Hormone;Myogenic gene expression

期刊名称：JOURNAL OF ANIMAL SCIENCE AND BIOTECHNOLOGY （ 影响因子：5.032； 五年影响因子：5.922 ）

ISSN： 2049-1891

年卷期： 2017 年 8 卷

页码：

收录情况： SCI

摘要： Background: The growth rate often varies among individual broilers of the same breed under a common management condition. To investigate whether a variation in the growth rate is associated with a difference in hormone levels and myogenic gene expression profile in broilers, a feeding trial was conducted with 10,000 newly hatched Ross 308 chicks in a commercial production facility under standard management. At 38 d of age, 30 fast-, 30 medium-, and 30 slow-growing broilers were selected among 600 healthy male individuals. The levels of insulin-like growth factor-1 (IGF-1), triiodothyronine (T3), thyroxine (T4), and growth hormone in the serum or breast muscle were assayed by ELISA or RIA kits, and the expression levels of several representative pro- and anti-myogenic genes in the breast muscle were also measured by real-time PCR. Results: Results showed that both absolute and relative weights of the breast muscle were in linear positive correlations with the body weight of broilers (P < 0.001). Fast-growing broilers had higher concentrations of IGF-1 than slow-growing broilers (P < 0.05) in both the serum and breast muscle. The serum concentration of T3 was significantly higher in fast- growing birds than in slow-growing birds (P < 0.05). However, no difference was observed in growth hormone or T4 concentration among three groups of birds. Additionally, a decreased expression of an anti-myogenic gene (myostatin) and increased expressions of pro- myogenic genes such as myogenic differentiation factor 1, myogenin, muscle regulatory factor 4, myogenic factor 5, IGF-1, and myocyte enhancer factor 2B, C, and D were observed in fast- growing broilers (P < 0.05), relative to slow-growing broilers. Conclusions: Collectively, these findings suggested that the growth rate is linked to the hormone and myogenic gene expression levels in broiler chickens. Some of these parameters such as serum concentrations of IGF-1 and T3 could be employed to breed for enhanced growth.

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