Determination of standardized prececal protein digestibility of canola meal in British United Turkeys Big ۶ at different ages using multiple linear regression procedure

ABSTRACT- Ninety six ۲-week-old British United Turkeys (BUT) Big ۶ were assigned to ۲ groups (۴ replicates of ۱۲ birds each). One basal diet and another one in which ۲۰% canola meal replaced the corn starch in the basal diet were prepared. At ۹, ۱۶ and ۲۱ wk of age, four birds from each pen slaughtered for digesta collection. The last two-third segment of the intestine, between the Meckel’s diverticulum and about ۲ cm anterior to the ileo-ceca-colonic junction, was excised. The diets and digesta were analyzed for dry matter, crude protein, and chromic oxide content. The standardized prececal protein digestibility of canola meal was calculated using multiple linear regression procedure. The standardized prececal protein digestibility of canola meal at ۲۱ wk of age was significantly lower as compared with that of ۹ wk of age; the relative weight of digestive organs also decreased significantly with increasing age (P< ۰.۰۵). By using multiple linear regression which accounted for the endogenous nitrogen losses, we showed that standardized prececal protein digestibility was also influenced by the age.

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Keywords: ، standardized prececal protein digestibility ، multiple linear regression ، canola meal ، British United Turkeys Big ۶