While eating these rations, cows maintained weight and body condition when they were gestating or lactating. In addition, calf performance was monitored and performance was similar to what would be expected for cow/calf pairs managed in a pasture setting.
Spring & early-summer calving compared to confinement system
The University of Nebraska has extensive data sets on spring calving and early summer (June calving) calving systems to compare to the confinement system. In these systems, records were kept on days grazing vegetative and dormant pasture, days grazing corn residue, and days fed distillers grains, hay, baled residues, and supplements.
The prices used for the comparison in 2013 are described in Table 1 (below). Distillers grains and stalks/straw are the major components and due to the drought in 2012-2013 the price of both feed ingredients are high. A different yardage was assessed for cows when they were in the dry lot, grazing stalks or pasture, or fed supplement while on pasture. The "cow cost" row in Table 1 represents all other costs in an annual cow budget and includes replacement costs. Percentage of calves weaned of females exposed was held constant across all systems at 90%.
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