Abstract A DEPRESSION in the growth of chickens by the inclusion of guar meal in their diets has been reported by Borcher and Ackerson (1950), Sathe and Bose (1962), Vogt and Penner (1963), Vohra and Kratzer (1964a) and Bakshi et al. (1964). Vohra and Kratzer (1964a) showed an improvement in the growth of chickens if the raw guar meal was autoclaved in layers of about 2.5 cm. thickness for 30 minutes at 2 atmospheric pressure and used as the source of protein along with fish meal. Improvement of guar meal by heat has also been confirmed by Bakshi et al. (1964). Our earlier work has indicated that growth of chickens was of the same order as on diets containing soybean meal if the autoclaved or the commercially available toasted guar meal was reacted with enzymes. The enzymes destroyed the growth-depressing effects of guar gum, a polysaccharide obtained from guar beans (Vohra…