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Summary and Implications This analysis shows that research pastures containsufficient protein and in most months energy to maintain abeef cow during the lactation phase of the yearly beefproduction cycle. Crude protein in comparison to the needsof a 1400 pound lactating beef range from 113 percent to220 percent of the requirement. Energy in comparison tothe same need ranged from 87 percent to 118 percent.Eleven of 36 months evaluated were below energy needs.However, previous research has demonstrated that cattlewill have selected forage intake that is 3 percent higher indigestible dry matter. Introduction Grazing pastures in the summer time remains the mosteconomical way of managing beef herds in the state ofIowa. Most Iowa herds are calved in the late winter or earlyspring, thus cows rely on pasture for their nutritionaldemands to maintain body weight, produce milk for theircalves and breed back for their next calf.To accomplish profitable beef production, pasturesmust supply sufficient dry matter of acceptable quality.Pasture quality can and does fluctuate during the growingseason, thus at times thrusting the producer and his herd into periods of inadequate nutrient supply. Adding to thecomplexity of this is the changes that occur in nutritionaldemands from a cow-calf unit. The calf is growing andstarting to consume more forage and the cow is being askedby the calf to produce more milk.The question is: How do Iowa pastures vary in qualityand are there periods of potential inadequate forage supplyand quality?

A Summary of Monthly Nutrient Values for Research Pastures in the Growing Months