The role of phytogenic feed additives in stress mitigation in broiler chickens

The increase in global temperature and consumers' welfare has increased the use of phytogenic feed additives (PFA) to mitigate the negative effects of heat stress on chickens in recent years. Various bioactive compounds capable of improving the thermotolerance of broiler chickens during exposure to thermal challenges have been identified in different plant species and parts. This review is an overview of the roles of bioactive compounds of different PFA, such as polyphenols and flavonoids, antioxidants, growth-promoting and immune-modulating agents, in heat stress management in broiler chickens. Common PFA in use, particularly in tropical environments, are also discussed. An understanding of the roles of the PFA in chickens' thermotolerance could further stimulate interest in their use, thereby improving the birds' productivity and addressing consumers' concerns. This review collates the existing data on the roles of herbs in mitigating heat stress on chickens and highlights future research perspectives.

Automated summary

The use of phytogenic feed additives (PFA) has been increasing to mitigate heat stress on chickens, which is caused by the rise of global temperature. Various bioactive compounds in different plant species and parts have been identified, such as polyphenols, flavonoids, antioxidants, growth-promoting and immune-modulating agents, that can improve the thermotolerance of broiler chickens. This review discusses the roles of PFA in managing heat stress and highlights common PFA used, particularly in tropical environments. It also emphasizes the importance of understanding the use of PFA in improving productivity and addressing consumers' concerns.