Monday, 7 November 2005 - 10:15 AM
67-8

Forage Quality of Corn, Sorghum, Sudangrass, and Bmr Hybrid Forages (Annual Forages).

Cindy A. Kinder1, Glenn E. Shewmaker2, Carl Hunt2, and Ron S. Thaemert1. (1) University of Idaho Extension, P.O. Box 429, Fairfield, ID 83327, (2) University of Idaho, P.O. Box 1827, Evergreen Bldg. 315 Falls Ave, Twin Falls, ID 83303-1827

Drought conditions are causing an increase of annual forage crop production. Five types of crops were grown; winter and spring cereals, warm season grasses, legumes, and brassicas. There is increasing interest in direct harvest of these less traditional forages by livestock through grazing. Quality of forages needs to be determined in order to help producers with livestock feed requirements. The objective is to measure forage quality 60 d after planting. Crop entries (44) were planted in 4 replications in a randomized complete block design 10-11 July 2003 near Kimberly, Idaho (42°30' N 116°30' W, 860 to 1300 m elevation). The 10 x 20 feet plots were furrow irrigated at 30-inch centers. The center 2 rows of corn at 30 inch rows, or center 5 ft of other forages were harvested to a 3-inch stubble height. Dry matter yield, digestible dry matter content (DDM), neutral detergent fiber (NDF), acid detergent fiber (ADF) and crude protein (CP) were determined for 16-19 Sept. 2003 harvest. Average DDM, NDF, ADF and CP (in %) for the five types of crops after 60 d growth include; winter cereals: 71, 45.6, 23, 24.3; spring cereals: 64.5, 56.2, 31.3, 18; warm season grasses: 61.1, 65.1, 35.7, 11.8; legumes: 67.7, 37, 27.2, 20.6; and brassicas: 75.5, 22.7, 17.2, and 20.5, respectively. Grazing annual forages in rotation with pastures or in the fall after pastures have reduced production can be a very viable option for producers. Quality of annual forages can be equal or greater than feeder alfalfa hay.

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