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In Vitro Protein Degradation of Cool Season Forages Planted with Minimum Tillage and No Fertilization¹

Department of Dairy Science, Louisiana Agricultural Experiment Station, Louisiana State University Agricultural Center, Baton Rouge 70803

ABSTRACT

Crude protein and in vitro protein degradation were evaluated for forages planted without nitrogen fertilization and tillage. Forages in yr 1 included two vetches, two crimson clovers, two subterranean clovers, arrowleaf clover, Persian clover, winter pea, ryegrass, and wheat. Forages in yr 2 were three vetches, crimson clover, subterranean clover, Berseem clover, and arrowleaf clover. Continuous growth was cut five times in yr 1 and twice during yr 2 at approximately 4-wk intervals. Legumes had greater protein content than grasses. Within legumes, Vanguard vetch and Woogenellup subterranean clover had the highest CP and crimson clovers the lowest in yr 1. During yr 2, hairy vetch exhibited the highest CP content while Tibbee crimson clover had the lowest. Crude protein content decreased with increasing forage maturity in both years. In vitro protein degradation in yr 1 was highest for winter pea and lowest for both subterranean clovers. In yr 2, hairy and Woodford vetch had the highest degradation and Berseem clover had the lowest. Overall, protein degradation was not affected by forage maturity. Correlations between CP and protein degradation were negative or low.

¹ Approved for publication by the Director of the Louisiana Agricultural Experiment Station as Manuscript Number 86-15-0217.

² Current address: Department of Agronomy, University of Nebraska, Lincoln 68583.

³ To whom correspondence should be addressed.

⁴ Department of Animal Science.