Abstract
A trial with 40 lactating Damascus goats was carried out in order to compare performance of goats on a concentrate mixture containing heat-treated soybean meal (H) with those on a mixture containing untreated soybean meal (C). Apparent digestion coefficients of diets C and H were measured with eight Chios wether sheep per diet. Degradability values of the concentrate mixtures C and H and of untreated and heat-treated soybean meal (SBM) were determined in three rumen fistulated dry Damascus goats. Heat treatment of SBM resulted in a significant reduction in effective degradability of DM and crude protein (CP) compared with non-heated SBM. Digestibility of nutrients was unaffected by heat treatment. There was no difference between treatments C and H for milk yield, 4% fat-corrected milk yield, milk composition, live weight changes and ruminal ammonia nitrogen (NH 3-N) and pH. Based on the present findings it can be concluded that feeding heat-treated SBM to lactating goats, if at negative energy balance, may not improve their milk yield.
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