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Evaluation of Corn Hybrids at Two Stages of Development for Grazing Heifers

^a Dep. of Crop and Soil Sci., Pennsylvania State Univ., University Park, PA 16802
^b Dep. of Dairy and Anim. Sci., Pennsylvania State Univ., University Park, PA 16802

View larger version (26K): [in a new window]   Fig. 1. Corn crude protein (CP) of the four hybrids at the silking and milk–dough grain stages of corn development in 1998 and averaged across the silking and milk–dough stages of development in 1999 and 2000. Different letters within years designate means that differ at p < 0.05 among hybrids. Statistical comparisons were not made among years. GrzM, Baldridge grazing maize; Bmr, Cargill F657 (a bm3 brown midrib hybrid); Conv, Pioneer brand 3335 (conventional hybrid); SBld, silage blend.

View larger version (26K): [in a new window]   Fig. 2. Acid detergent fiber (ADF) of the four hybrids at the silking and milk–dough grain stages of corn development in 1998 and averaged across the silking and milk–dough stages of development in 1999 and 2000. Different letters within years designate means that differ at p < 0.05 among hybrids. Statistical comparisons were not made among years. GrzM, Baldridge grazing maize; Bmr, Cargill F657 (a bm3 brown midrib hybrid); Conv, Pioneer brand 3335 (conventional hybrid); SBld, silage blend.

View larger version (25K): [in a new window]   Fig. 3. Neutral detergent fiber (NDF) of the four hybrids at the silking and milk–dough grain stages of corn development in 1998 and averaged across the silking and milk–dough stages of development in 1999 and 2000. Different letters within years designate means that differ at p < 0.05 among hybrids. Statistical comparisons were not made among years. GrzM, Baldridge grazing maize; Bmr, Cargill F657 (a bm3 brown midrib hybrid); Conv, Pioneer brand 3335 (conventional hybrid); SBld, silage blend.