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1378
SafeGainTM (ruminally-protected lysine) for growing beef cattle
Crossbred heifers (n=448; 287 ± 14.1 kg initial BW) were used in a randomized complete block experiment to assess growth response to SafeGain, a lipid-encapsulated, ruminally-protected form of lysine sulfate. The basal diet consisted of (DM basis) of 45% brome hay, 25% steam-flaked corn, 25% wet corn gluten feed, and supplement. Based on Level 2 estimates from the Nutrient Requirements of Beef Cattle Update 2000, heifers were projected to consume 134% of their lysine requirement with the basal diet alone. Treatments consisted of dietary additions of 0, 15, 30, or 45 g/d of SafeGain. Heifers were blocked by initial BW; implanted with Component TE-IH; allocated within strata to 64 partially-shaded, concrete-surfaced (4.3 m x 8.6 m) pens with 7 heifers/pen and 16 pens/treatment; and fed once daily for 112 d. At the end of the 112-d growing trial, a subset of 12 blocks was consolidated, such that 2 pens from each growing treatment were combined to make one finishing pen. Cattle were weighed, re-implanted with Component TE-200, relocated to finishing pens, and fed a common finishing diet (no supplemental lysine) for 94 d until harvest to evaluate possible carryover effects of SafeGain. At the end of the finishing period pens of cattle were weighed, loaded onto trucks, and transported 450 km to a commercial abattoir for harvest. Liver abscess incidence and HCW were collected the day of harvest, and carcass traits were evaluated following 32 h of refrigeration. Growing phase performance and resulting HCW are summarized in the table, below. SafeGain was effective for improving performance of cattle fed roughage-based backgrounding diets.
Keywords: lysine, growing cattle, SafeGain<sup>TM</sup>