We have developed anew technique for the application of microtracer technology to the on-site assessment of microingredient uniformity in diets for feedlot cattle. The influence of dietary forage (12 vs 24%) and molasses levels (6, 12, 18, and 24%) on the efficiency of recovery of microtracer (33 g/ton) using this new technique was compared with that of chromic oxide (87.4 g/ton) and laidlomyci...

William Sibbald was born June 28, 1946, and died September 14, 2006, at his home in Toronto, Ontario, surrounded by his family after a two-year battle with cancer. He was 60 years old. Up until two days before his death, he remained the Physician-in-Chief of Sunnybrook Health Sciences Centre in Toronto, Editor-in-Chief of the Journal of Critical Care and a lifelong dynamic force for the advance...

To date, research on testosterone and behavior has focused on individuals, even when studying social behaviors that necessarily involve multiple participants. Here, we explore male responses to other males of different dominance ranks and testosterone levels in a population of wild baboons. In chacma baboons (Papio hamadryas ursinus) of the Okavango Delta, a male’s testosterone is related to hi...