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Mechanism of continuous high temperature affecting growth performance, meat quality, and muscle biochemical properties of finishing pigs

文献类型： 外文期刊

作者： Ma, Xianyong 1 ; Wang, Li 1 ; Shi, Zibiao 1 ; Chen, Wei 1 ; Yang, Xuefen 1 ; Hu, Youjun 1 ; Zheng, Chuntian 1 ; Jiang, Zo 1 ;

作者机构： 1.Guangdong Acad Agr Sci, Inst Anim Sci, Guangzhou 510640, Guangdong, Peoples R China

2.Minist Agr, Key Lab Anim Nutr & Feed Sci South China, Guangzhou, Guangdong, Peoples R China

3.State Key Lab Livestock & Poultry Breeding, Guangzhou, Guangdong, Peoples R China

4.Guangdong Key Lab Anim Breeding & Nutr, Guangzhou, Guangdong, Peoples R China

5.Guangdong Engn Technol Res Ctr Anim Meat Qual & S, Guangzhou 510640, Guangdong, Peoples R China

关键词： Growth performance; High ambient temperature; Meat quality; mRNA array; Restricted feed intake

期刊名称：GENES AND NUTRITION （ 影响因子：5.523； 五年影响因子：4.4 ）

ISSN： 1555-8932

年卷期： 2019 年 14 卷

页码：

收录情况： SCI

摘要： BackgroundThe mechanism of high ambient temperature affecting meat quality is not clear till now. This study investigated the effect of high ambient temperature on meat quality and nutrition metabolism in finishing pigs.MethodsAll pigs received the same corn-soybean meal diet. A total of 24 Landrace x Large White pigs (60kg BW, all were female) were assigned to three groups: 22AL (fed ad libitum at 22 degrees C), 35AL (ad libitum fed at 35 degrees C), and 22PF (at 22 degrees C, but fed the amount consumed by pigs raised at 35 degrees C) and the experiment lasted for 30days.ResultsFeed intake, weight gain, and intramuscular fat (IMF) content of pigs were reduced, both directly by high temperature and indirectly through reduced feed intake. Transcriptome analysis of longissimus dorsi (LM) showed that downregulated genes caused by feed restriction were mainly involved in muscle development and energy metabolism; and upregulated genes were mainly involved in response to nutrient metabolism or extracellular stimulus. Apart from the direct effects of feed restriction, high temperature negatively affected the muscle structure and development, energy, or catabolic metabolism, and upregulated genes were mainly involved in DNA or protein damage or recombination, cell cycle process or biogenesis, stress response, or immune response.ConclusionBoth high temperature and reduced feed intake affected growth performance and meat quality. Apart from the effects of reducing feed intake, high temperature per se negatively downregulated cell cycle and upregulated heat stress response. High temperature also decreased the energy or catabolic metabolism level through PPAR signaling pathway.

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