Ruminal escape and intestinal digestibility of experimental ruminal protected lysine supplements
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Ruminal escape (RE) and intestinal digestibility (ID) of experimental lysine supplements was evaluated. In trial one, no differences were observed in RE of DM and N of five products differing in source of hydrogenated oil (soybean oil [SB] or rapeseed oil [RS]) with 0 or 2% oleic acid in the RS coating. Intestinal digestibility of N was higher with RS than with SB and inclusion of oleic acid improved DM and N ID. In trial two, RE of N and lysine was greatest for two experimental products, but ID was highest for three commercial products. In trial three, RE of N and lysine decreased as oleic acid increased and as the concentration of lysine increased. No differences were observed in ID of N or lysine. These trials indicate that the proportion of lysine in the product and composition of the fat coating influences RE and ID of N and lysine.