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Nutritional Value of Brown Midrib Corn Silage for Lactating Dairy Cows^{1 ,2,}

Department of Animal Sciences and Department of Agronomy, Purdue University, West Lafayette, IN 47907

ABSTRACT

Brown midrib-3 corn (Zea mays L.) silage and its normal genetic counterpart were fed in complete mixed rations to lactating Holstein cows at two forage-to-concentrate ratios (75:25 and 60:40, dry matter). The brown midrib silage contained 24% less lignin than the normal. Average daily intake of dry matter and milk composition did not differ with genotype of the corn or forage-to-concentrate ratio. Milk yield, actual and fat-corrected, was 1.3 and .9 kg greater for cows fed brown midrib-3 silage than for cows fed normal silage at 75:25. Milk yield was 1.6 and 1.0 kg greater, actual and fat-corrected, for cows fed brown midrib than for those fed normal silage at 60:40. Forage-to-concentrate ratio of the ration did not affect milk yield.

¹ Journal Paper No. 7063, Purdue University Agricultural Experiment Station.

² This research supported in part by grant from Eli Lilly Foundation.

³ Department of Animal Sciences.

⁴ Department of Agronomy.

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