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The effect of different heating methods on chemical composition, gas production parameters and digestibility of laying hen litter
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Fatemeh Fathi   , Javad Bayat Kouhsar * , Farzad Ghanbari , Abbasali Naserian , Shahriar Maghsoudloo |
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Abstract: (293 Views) |
Introduction: This study was conducted to investigate the effect of different heat treatment methods dry heat (at 60°C for 24 hours and 80°C for 40 minutes) and moist heat (autoclave) on the chemical composition, gas production parameters, and digestibility of laying hen manure.
Materials & Methods: The experimental treatments included: 1) dry heat at 60°C for 24 hours, 2) dry heat at 80°C for 40 minutes, and 3) moist heat using an autoclave (121°C for 15 minutes). The chemical composition, gas production parameters, and digestibility of the samples were then measured.
Results: The results showed a significant difference among treatments in terms of chemical composition (dry matter, protein, and acid-detergent insoluble ash) (P<0.05). The highest and lowest values for acid-insoluble ash were observed in the autoclave and 60°C treatments, respectively. Among the heat treatments, the autoclave treatment had the lowest potential and rate of gas production, while the 80°C treatment showed the highest values. There was no significant difference among treatments for the digestibility of dry matter and organic matter (P>0.05). The lowest values for the partitioning factor and microbial mass production were related to the autoclave treatment, and the highest values were related to the 80°C treatment (P<0.05).
Conclusion: Overall, the results of this study indicated that dry heat treatment methods (at 60°C and 80°C) had similar effects on the nutritional value of laying hen manure. However, autoclave treatment led to a decrease in digestibility and fermentation parameters. Therefore, the choice of the treatment method depends on the available facilities and the ultimate goal (e.g., increasing protein content versus digestibility). |
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| Keywords: Laying hen litter, Heat processing, Autoclave |
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Full-Text [PDF 727 kb]
(89 Downloads)
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Type of Study: Research |
Subject:
Special
Received: 2026/06/5 | Accepted: 2026/05/31 | Published: 2026/09/7
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