Effect of supplementing AGRADOReg. antioxidant (AOX) on feedlot performance and carcass characteristics of beef steers and shelf-life of beef

Choat, W.T.; Brooks, J.C.; Krehbiel, C.R.; Nelson, J.; Gill, D.; Morgan, J.B.; Ball, R.; Saylor, D.H.; McDowell, L.R.

Animal Science Research Report Agricultural Experiment Station, Oklahoma State University (P-993): 4 pp.

2002


Accession: 003735591

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Abstract
This experiment was conducted to determine the effects of feeding Agrado on the performance and carcass characteristics of beef cattle, case-life of beef, and antioxidant concentration in serum. 150 mixed crossbred steers in 3 weight blocks and 30 pens (10 pens/block; 5 hd/pen) and consuming a high-concentrate diet were supplemented with either 0 or 150 ppm Agrado for 25 days prior to harvest. Adding Agrado for this period of time had no affect on gain, feed intake, or feed efficiency. Supplemental Agrado did not affect lean maturity, an indicator of darkness of ribeye colour. As for other quantitative carcass traits, no differences were observed. However, supplementation with Agrado did improve retail display characteristics of top loin steaks compared with controls. While no treatment differences were observed for thiobarbituric acid (TBARS) levels, the improvement in retail display characteristics did extend the shelf life of top loin steaks by one day, determined by the day on which the subjective evaluation of overall acceptability reached a score of 3.0. Blood serum analyses were made to correlate certain systemic antioxidant levels with Agrado supplementation to better understand the mode of action by which Agrado might prevent rancidity in fat and muscle tissue. However, Agrado supplementation had no effect on serum levels of vitamins A and E, and beta-carotene compared with controls when included in the diet during the last 25 days of the feeding period.