Effects of postbiotics on growth performance of broilers under heat stress

報告時間：2025-6-20
報告地點：Room 407
指導老師：Shuen-Ei Chen
學生：Pensiri Sutato
摘要

Heat stress (HS) presents significant challenges in poultry production, which tend to disrupt immune function, cause metabolic imbalances, and impair growth performance. This study aims to evaluate effects of dietary supplementation of postbiotics on growth performance of broilers under heat stress. Seventy broiler chickens were randomly allocated to 7 experimental groups; comfort condition control group (CON 26), a heat – stressed control group (CON HS) and five treatment groups supplemented with different postbiotics (GABA 10, GABA 20, SYN, LP, and BA). The trial lasted six weeks, with daily cyclic heat stress at 34℃ for 4 hours from day 21 to 42. Results showed that body weight (BW) gain was significantly impaired by HS and GABA 20, SYNLAC, and LP improved BW gain and/or feed intake and feed conversion rate. Heat stress promoted rectal temperatures, respiratory rates and occasionally heart rates and blood pH values. Some of the postbiotics lowered rectal temperatures, alleviated respiratory rates and alkalosis, relieved plasma corticosterone and NEFA levels in broilers in most time points long the growth under HS. Moreover, postbiotics supplementation also improved meat quality, in which   some groups showed higher pH, reduced cooking and centrifuge losses, and lower TBARS values in the breast muscle, indicating better water-holding capacity and oxidative stability. These results suggest that supplemental postbiotics serve as a promising nutritional intervention not only to enhance broiler chicken welfare and productivity under heat stress conditions but also increase meat quality, potentially improving sustainability in poultry farming.
  
Key words: Heat stress, broilers, postbiotics, meat quality, anti-thermal stress
 
參考文獻
  • Abdel-Moneim, A. E., Shehata, A. M., Khidr, R. E., Paswan, V. K., Ibrahim, N. S., El-Ghoul, A. A., Aldhumri, S. A., Gabr, S. A., Mesalam, N. M., Elbaz, A. M., Elsayed, M. A., Wakwak, M. M., & Ebeid, T. A. (2021). Nutritional manipulation to combat heat stress in poultry – A comprehensive review. Journal of Thermal Biology, 98, 102915.
  • Humam, A. M., Loh, T. C., Foo, H. L., Izuddin, W. I., Awad, E. A., Idrus, Z., Samsudin, A. A., & Mustapha, N. M. (2020). Dietary supplementation of postbiotics mitigates adverse impacts of heat stress on antioxidant enzyme activity, total antioxidant, lipid peroxidation, physiological stress indicators, lipid profile and meat quality in broilers. Animals, 10(6), 982.
  • Humam, A. M., Loh, T. C., Foo, H. L., Samsudin, A. A., Mustapha, N. M., Zulkifli, I., & Izuddin, W. I. (2019). Effects of feeding different postbiotics produced by Lactobacillus plantarum on growth performance, carcass yield, intestinal morphology, gut microbiota composition, immune status, and growth gene expression in broilers under heat stress. Animals, 9(9), 644.
  • Liu, L., Ren, M., Ren, K., Jin, Y., & Yan, M. (2020). Heat stress impacts on broiler performance:A systematic review and meta-analysis. Poultry Science, 99(11), 6205–6211.
  • Rakngam, S., Zhu, Y., Okrathok, S., Pukkung, C., & Khempaka, S. (2024). Enhancing heat stress resilience in broiler chickens through the use of probiotics and postbiotics: A review. Tropical Animal Science Journal, 47(4), 538–548.
  • Siddiqui, S. H., Khan, M., Kang, D., Choi, H. W., & Shim, K. (2022). Meta-analysis and systematic review of the thermal stress response: Gallus gallus domesticus show low immune responses during heat stress. Frontiers in Physiology, 13, 809648.