Abstract
The digestibility of protein and energy in diets containing heated and unheated soybean meal was determined with colostomized laying hens. The data obtained showed that protein in diets containing unheated soybean meal was only 54% digested compared with 85% for heated meal. The difference in protein digestibility was sufficient to account for the difference in energy digestibility. The metabolizable energy value of diets with heated or unheated soybean meal was determined after 12, 36, 67, and 97 days of feeding. There was no evidence of a change in the metabolizable energy value of the diets with time. Adult chickens did not respond differently from young chicks to diets containing unheated soybean meal. These experiments also showed that hens did not adapt, following a prolonged feeding period, so that they were better able to digest unheated soybean meal.
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