Animal Bioscience

Asian Australasian Association of Animal Production Societies (아세아태평양축산학회)
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Effect of pre-slaughter fasting time on carcass yield, blood parameters and meat quality in broilers

  • Xuezhuang Wu (College of Animal Science, Anhui Science and Technology University) ;
  • Yahao Zhou (College of Animal Science, Anhui Science and Technology University) ;
  • Zhentao Lu (College of Animal Science, Anhui Science and Technology University) ;
  • Yunting Zhang (College of Animal Science, Anhui Science and Technology University) ;
  • Tietao Zhang (Institute of Special Animal and Plant Sciences, Chinese Academy of Agricultural Sciences)
  • Received : 2023.07.16
  • Accepted : 2023.09.12
  • Published : 2024.02.01
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Abstract

Objective: The aim of this study was to evaluate the effect of pre-slaughter fasting time on carcass yield, meat quality, blood parameters and glucose metabolism in broilers. Methods: Four hundred and fifty Arbor Acres (AA) broilers at 42 days of age were divided into 5 groups with 6 replicates in each group and 15 chickens as one replicate. Following this period, broilers from each group were distributed among five groups according to preslaughter fasting period as 4, 8, 12, 16, or 20 h. Results: With increasing fasting time, the carcass yield (p<0.01), the breast muscles yield (p<0.01) and the thigh yield (p<0.01) of the broilers were all linearly increased. With increasing fasting time, the L* values (p<0.01), cooking loss (p = 0.020), moisture content (p<0.01) in the leg muscles linearly downregulated, while the drip loss (p = 0.043), pH45 min (p<0.01) and pH24 h (p<0.01) were linearly upregulated. A trend for a lower (p = 0.071) shear force in the leg muscles was also observed in broilers fasted for longer time. Similar results were also found in breast muscles. The different fasting treatments did not influence the breast muscles glycogen content (p>0.10), while the increase of fasting time resulted in a linear decrease of the blood glucose (p = 0.021) and, more specifically, the glycogen content of the liver and leg muscles (p<0.001). With increasing fasting time, the aspartate transaminase (p<0.01), uric acid (p<0.01), and triglycerides (p<0.01) in serum linearly downregulated, while the alanine aminotransferase was linearly upregulated. Conclusion: The results of this study show a significant influence of fasting time on carcass yield and meat quality in broilers. Moderate fasting (8 to 12 h) before slaughter can reduce the weight loss of broilers. Prolonged fasting (≥16 h) increased body weight loss, decreased slaughtering performance and fluctuating blood indexes of broilers.

Keywords

Acknowledgement

Agreements to Anhui Provincial Natural Science Foundation (2108085MC114) and Agricultural Science and Technology Innovation Program of China (Grant Nos. CAAS-ASTIP2021-ISAPS) by their financial support.

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