Perosis of Chicks on Diet with Unbalanced Energy and Protein Levels

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Abstract
High incidence of perosis was observed repeatedly on meat-type chicks fed low protein-high energy experimental diet in this laboratory. Results of three experiments to find out dietary factor or factors related to the appearance of perosis were summarized as follows: Nicotinic acid, biotin, vitamin B12, phosphorus, zinc and magnesium supplemented to the perotic diet, which contained enough choline, folic acid and manganese, had little effect to prevent perosis. Perosis was observed not only on the meat-type chicks fed the semi-purified low protein-high energy diet but also on those fed the diet containing common feed ingredients, such as yellow corn. Decrease in dietary energy by adding cellulose in the perotic diet was effective to prevent perosis. Though increase in dietary protein level was effective to prevent perosis, chicks on the higher protein diet showed the symptoms of perosis if dietary energy level increased further. Therefore, it was suspected that high level of dietary energy, rather than dietary protein itself, has direct influence on the appearance of perosis. Incidence of perosis of White Leghorn chicks on the perotic diet was significantly lower than that of meat-type chicks, suggesting the breed difference of susceptibility to the perotic diet. Little difference was observed on the incidence of perosis between males and females. No difference was observed between the symptoms of perosis of the chicks on the high energy perotic diet and on the diet deficient in manganese. However, body fat deposition and plasma alkaline phosphatase activity of the chicks on the high energy perotic diet were significantly higher than those of the chicks on the manganese deficient diet and on the control diet. Therefore, biochemical mechanism of perosis on the high energy diet is suspected to be different with that of manganese deficiency.

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