dried distillers grains, phosphorus, dietary concentration, finishing steers
Eight crossbred steers (initial BW = 972.2 ± 33.5 lb) were used in a replicated Latin square design to determine the effect of increasing dietary concentrations of dried distillers grains plus solubles (DDGS) on phosphorus (P) balance in finishing steers. The control (CON) diet contained 79% dry rolled corn (DRC), 10% cottonseed hulls, 6% soybean meal (SBM), and 5% mineral supplement (total diet P concentration = 0.26%). In each of the remaining three diets, all of the SBM and a portion of the DRC were removed and replaced with DDGS at 12%, 24%, and 36% of the diet (total diet P concentrations = 0.28%, 0.33%, and 0.37%, respectively). Steers were housed in indoor, slatted-floor pens (5.6 x 8.5 ft) during a 21-d diet acclimation period prior to a 5-d total fecal and urine collection period. All samples (feed ingredients, feed refusals, feces, and urine) were analyzed for P concentration. Phosphorus intake increased from 18.6 to 27.8 g/d as the concentration of DDGS was increased in the diet. Fecal P was not affected by treatment. Urinary P, total P excretion, and P retention increased as the level of DDGS in the diets increased. In regression analyses, fecal P, total P excretion, and P retention were influenced by P intake. Urinary P tended to be influenced by P intake. Results of the experiment clearly demonstrate that as the levels of DDGS in the diets of finishing steers increases P excretion increases.
Number of Pages
South Dakota State University
Copyright © 2006 South Dakota State University
Benson, Clint; Wright, Cody; McCarthick, Josh; and Pritchard, Robbi, "Effect of Increasing Dietary Concentration of Dried Distillers Grains plus Solubles on Phosphorus Balance in Finishing Steers" (2006). South Dakota Beef Report, 2006. 2.