Document Type

Thesis - Open Access

Award Date


Degree Name

Doctor of Philosophy (PhD)

Department / School

Animal Science


Two studies were conducted to evaluate the effect on the productive value of a diet for broilers containing high levels of wheat bran with a supplement of cellulose from Trichoderma viride. In both studies, broiler-type, mixed sex chicks were divided into replicate groups of 10 birds each and fed for 5 weeks. The wheat bran was defatted and added at 0, 10 and 20% levels. A fourth group received the 20% wheat bran plus a cellulose enzyme added at the level of 0.008%. The summarized data showed that the 20% wheat bran plus cellulose treatment had no significant effect on feed consumption and feed-to-gain ratio compared with the 10% wheat bran group. Cellulase supplementation significantly increased dry matter content and ash content of the excreta and significantly improved the digestibilities of dry matter and all cell wall components of the excreta. In the second part of the study, after the five week experimental period, the four diets with 1% chromic oxide were fed for five hours, after which the chicks were fasted for 14 hours. Feces were collected for 8 hours after withdrawl of the diet (13 hours after feed was offered). The excreta were collected in two parts, one voided in the daytime (from 7:30 a.m. to 8:30 p.m.) and the other during the night (from 5:30 p.m. to 6:30 a.m. the next day) and analyzed separately. Calcium, phosphorus, iron, zinc and copper associated with cell walls largely were solubilized by cellulose. Iron balance was negative in the 10% and 20% wheat bran groups. However, ferrous or ferric iron which is bound by bran was readily made available for absorption by cellulose.

Library of Congress Subject Headings

Broilers (Poultry) -- Feeding and feeds

Broilers (Poultry) -- Growth

Chickens -- Feeding and feeds

Chickens -- Growth



Number of Pages



South Dakota State University