Effect of Including Rapeseed Meal in the Ration of Broiler-Type Chickens on the Incidence of Perosis and the Ineffectiveness of Supplemental Manganese

A study was conducted to determine whether the inclusion of rapeseed meal in the ration of broiler-type chickens increased the incidence of perosis by decreasing the availability of manganese in the ration. Results showed that when broiler-type chickens were fed rations in which soybean meal or a combination of rapeseed meal and soybean meal served as the supplementary sources of protein a significantly higher incidence of perosis was noted in the chicks fed the latter ration as compared to chicks fed the former. Increasing the level of manganese in the rapeseed meal containing ration did not appear to lower the incidence of perosis.