An extended grazing period with mature grasses or summer
grazing with warm-season grasses usually does not
sate the requirement on protein and energy for actively
growing heifers and milking cows because of low nutrient
concentration and low DM intake [1]. Supplement
programs boosting protein, energy, or minerals are commonly
practiced in livestock operations when feeding
cattle with low quality forage. Well managed supplement
programs increase DM intake of forage and ultimately