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Restricted feeding regimens improve white striping associated muscular defects in broiler chickens 被引量:1

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摘要 The current study investigated the effects of intermittent feeding(IF)and fasting strategies at different times post–hatch on muscle growth and white striping(WS)breast development.In the first trial,32 one-day-old Abor Acre broilers were fed ad libitum(AL)for 3 d post–hatch and then randomly allotted into 4 feeding strategies including AL,1h-IF group(1 h IF,4 times feeding/d,1 h each time),1.5h-IF(1.5 h IF,4 times feeding/d,1.5 h each time),and fasting(1d acute fasting,6 d free access to feed)groups and fed for 7 d.Although angiogenic genes including VEGFA,VEGFR1,and VEGFR2,and myogenic genes including MYOG and MYOD were upregulated(P<0.05),the breast muscle satellite cell(SC)number and PAX7,MYF5 expression were decreased by the IF strategies(P<0.05).One-day fasting at 6 d of age also upregulated angiogenic genes and MYOD expression(P<0.05),downregulated MYF5 expression(P<0.05),but did not change SC number(P>0.05).In the second trial,384 one-day-old birds were fed AL for 1 wk and then randomly allotted to the above 4 feeding strategies starting at 8 d of age until 42 d of age.Similarly,IF and fasting strategies upregulated the expression of angiogenic and myogenic genes(P<0.05).Both 1h-IF and 1.5h-IF increased breast muscle SC number(P<0.05).At slaughter,breast muscle fiber diameter of 1.5h-IF was smaller but the SC number was larger than that of the birds fed AL(P<0.05).The IF and fasting strategies prevented WS development,and reduced breast WS scores and triglyceride content(P<0.05)without changing the body weight(P>0.05).Fasting and 1h-IF reduced the expression of adipogenic genes ZNF423 and PDGFRα(P<0.05).Moreover,IF and fasting strategies reduced fibrosis in breast muscle and reduced skeletal muscle-specific E3 ubiquitin ligases(TRIM63 and MAFBX)(P<0.05).Fasting significantly reduced CASPASE-3 in breast muscle(P<0.05).In conclusion,IF starting in the first week decreases SC number.Compared to AL,IF or fasting promotes muscular angiogenesis,increases SC number,prevents muscle degeneration,and prevents the development of WS without impairing the growth performance of broiler chickens.
出处 《Animal Nutrition》 SCIE CSCD 2023年第1期128-137,共10页 动物营养(英文版)
基金 financially supported by the National Key R&D Program of China(2018YFE0127300) the 2115 Talent Development Program of China Agricultural University the Young Talent Supporting Program Funding of the College of Animal Science and Technology,China Agricultural University Education Foundation Grant (1041-2221002).
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