Author : Ryan Dijkhuis
Publisher :
ISBN 13 :
Total Pages : pages
Book Rating : 4.:/5 (66 download)
Book Synopsis Feeding Optaflexx 45 (ractopamine-HCl) to Cull Cows by : Ryan Dijkhuis
Download or read book Feeding Optaflexx 45 (ractopamine-HCl) to Cull Cows written by Ryan Dijkhuis and published by . This book was released on 2007 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: Data were analyzed using the MIXED procedure of SASutilizing animal as the experimental unit. Significance was determined at P [greater than] 0.05. Hot carcass weight tended (P = 0.14) to be lower for the 100 mg/hd/d group compared to the control. Dressing percent tended (P = 0.19) to be lower for the 200 mg/hd/d group compared to the control. There were no differences in ribeye area, or percent intramuscular fat. There was a trend (P = 0.11) for percent fat-free lean to increase as ractopamine-HCl dose increased. Ractopamine-HCl had minimal effects on meat tenderness overall for the nine muscles evaluated. The 200 mg/hd/d VAL type I fiber increased in cross sectional area and diameter. SMB and VAL fibers underwent a fiber-type shift from type I fiber to type II fiber in the 200 mg/hd/d group. In conclusion, feeding ractopamine-HCl at the 100, 200, or 300 mg/hd/d level to cull beef cows has little to no effect on carcass characteristics in comparison to feeding with the exclusion of ractopamine-HCl, but ractopamine did have some minimal effects on total fat-free lean percentage and WBSF values. An unexpected histological change was observed in muscle fiber which has not been reported in cull cows treated with ractopamine-HCl.