Effect of XXXX on tissue gain and carcass merit of feedlot beef steers.

@entity4742 @entity4743 @entity1017
The effect of @entity4742 ( @entity4743 ) on the composition of tissue gain of Hereford steers was studied in a complete slaughter balance trial. Eight steers were slaughtered initially (IS) and, after 177 days on feed, eight control steers (C) and seven steers that had been fed 20 mg @entity4743 daily ( @entity4743 ) were slaughtered. Initial full body weight averaged 224.8 kg, and final full body weight averaged 403.0 kg for the C steers and 433.6 kg for the @entity4743 steers. Final empty body weight averaged 346.6 kg for the C steers and 368.0 kg for the @entity4743 steers. @entity4743 improved live @entity1017 by 17% and conversion of feed dry matter to live weight by 12%. Recovery of wet weight during slaughter averaged 99.6%. @entity4743 steers had larger rib cut weights and greater proportions of separable lean and bone plus connective tissue in the rib cuts than C steers, an ribeye area tended to be larger in @entity4743 steers. @entity4743 caused a small shift in relative body composition toward more protein, moisture and ash. Tissue gain in @entity4743 steers consisted of 28.3% more protein, 26.0% more moisture, 73.2% more ash, 1.5% less fat and 109.1% more residual (dry matter not accounted for by N x 6.25, ether extract and ash) than did tissue gain in C steers. Energy gain per unit of energy intake over the feeding period was not affected by @entity4743 treatment, but @entity4743 improved protein gain per unit of protein intake and per unit of energy intake by approximately 20% within the total empty body and by about 25% within the carcass fraction. Results confirm indirect estimates in the literature indicating that @entity4743 increases skeletal growth and lean tissue deposition in feedlot steers.
