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Nutritive Value of Oat and Pea Components of a Forage Mixture Harvested Sequentially^1,2,

Alaska Agricultural Experiment Station, University of Alaska, Palmer 99645
and Crops Research Division, ARS, USDA, Palmer 99645

ABSTRACT

Herbage was sampled from small plots of oats and peas (Avena sativa L. and Pisum arvense L.) at weekly intervals from late July through early October in south-central Alaska during 1965, 1966, and 1967. Samples were separated into oat and pea components to determine changes within each species throughout this period of growth and maturation. Phenological notes and analytical data were obtained for the two species at each sampling date. Levels of crude protein declined continuously in oats but remained relatively uniform in peas after increasing initially. Cell wall constituents and acid-detergent fiber values varied with dates of sampling and were consistently higher in oats than in peas. Lignin remained relatively constant at 5% in peas and increased to this level in oats by early-milk stage of maturity. This study provides substantiating evidence that oats and peas are complementary in the forage mixture. Growth was determinate for oats and indeterminate for peas.

¹ Alaska Agricultural Experiment Station Journal Paper no. J-106.

² Research supported in part by Crops Research Division, Agricultural Research Service, U.S. Department of Agriculture.