By-products replacing ground corn for dairy cows rotationally grazing elephant grass: milk yield and composition
Abstract
This study investigated the effects of different by-products used as feedstuffs to replace ground corn in the supplement of Holstein dairy cows rotationally grazing intensively managed elephant grass. Five experiments were conducted to evaluate pelleted citrus pulp (PCP), corn gluten feed (CGF), whole cottonseed (WCS), wheat middlings (WHM), and soybean hulls (SBH) as alternatives to ground corn. The experiments followed a Latin square design and assessed blood and performance parameters such as milk yield (MY) and milk composition. Blood parameters were not affected (p > 0.05) by any by-products. The inclusion of PCP, CGF, and SBH up to 75%, and WHM up to 50% in place of corn did not affect (p > 0.05) either MY or milk composition. However, increasing the level of WCS up to 21% resulted in a significant reduction (p < 0.05) in yields of milk, 3.5% fat-corrected milk, protein, and milk solids, along with an increase (p < 0.05) in milk urea nitrogen. Our results suggest the use of PCP, CGF, WCS, WHM, and SBH replacing corn in the supplement up to 75, 75, 14, 50, and 75%, respectively, has no adverse short-term effects on MY and composition of Holstein cows grazing intensively managed elephant grass.
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