Abstract
An experiment was conducted to compare effects of emulsified soybean oil and non-emulsified soybean oil on the quality of broiler feed differing in the feed type and the broiler feeding stage in vitro. A 2 × 2 × 3 factorial arrangement was designed with two fat sources (soybean oil and emulsified oil), two feed types (mash and pellet) and three broiler feeding stages (starter, grower and finisher). Four samples of feeds were collected from each combination of factors at the beginning of the experiment and stored at 20°C. Subsamples were taken at 15-day intervals to determine the moisture content, peroxide value (PV), acid value (AV) and the total fungal count over a 45-day period; weight loss percentage was determined by weighting the samples at days 0, 15, 30 and 45; fines percentage in pellets was only determined at day 0. The emulsified oil reduced (P < 0.05) the fines percentage, increased (P < 0.05) the moisture content, decreased (P < 0.05) the weight loss percentage and PV, did not affect (P > 0.05) the AV and the total fungal count. Results showed that the emulsified oil decreased weight loss, increased pelletability, moisture content and oxidation stability without affecting fungal growth.
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