| Two experiments were conducted to determine the effect of feeding supplemental fat supplied from dried distillers grains with solubles (DDGS) or raw corn oil on cow performance, nutrient digestibility, and plasma concentrations of long-chain fatty acids, insulin-like growth factor-1, growth hormone, and non-esterified fatty acids. In experiment 1, 60 non-pregnant beef cows (BW = 553.5 +/- 38.7 kg; BCS = 5.4 +/- 0.5) were randomly allotted to 1 of 15 pens (n = 4 per pen; 14.6 m x 37.2 m) and assigned to 1 of 3 dietary treatments: supplemental fat from DDGS (DG), supplemental fat from corn oil (OIL), or no supplemental fat (NO OIL). Treatments comprised 35% of dietary DM to provide the maximum amount of fat possible from DDGS without inducing health problems due to excess sulfur (S) intake. Distillers grains and OIL treatments were formulated to be isolipid and isonitrogenous, whereas the NO OIL treatment was formulated to be isonitrogenous to DG and OIL with no additional fat. Weights were recorded prior to feeding on d -1, 0, 28, 59, and 60. |
