The invention relates to an avian growth promoting agent comprising manosilicate plate (NSP), using an inorganic exfoliated clay (e.g., nano-exfoliated montmorillonite) as a growth promoting agent to promote avian growth rate and thus to reduce additions of antibiotics accordingly.本發明係關於使用無機脫層黏土(例如奈米化脫層型的蒙脫土)當做生長促進劑,以提高禽類生長速率,並藉以降低抗生素之添加。