Storage Characteristics of Large Round and Square Alfalfa Bales: Low-Moisture Wrapped Bales

Abstract

Abstr act. Substantial dry matter (DM) and quality losses have been reported for partially dried alfalfa that has been rained on before moisture reduction to levels acceptable for dry hay storage. The objective of this research was to determine the feasibility of preserving alfalfa baled at less than 45% moisture (w.b.) by wrapping in plastic film. Large round and large square bales were preserved as individually wrapped or tube wrapped silage bales at two moisture ranges: approximately 40% to 55% and 30% to 40% w.b. The tube wrap system was 50% more productive while requiring 43% less plastic compared to individually wrapped bales. Storage characteristics were quantified by DM loss, change in nutrient composition, fermentation products, and heating after removal from storage. Average DM loss during storage was 3.5% and 2.3% for the high and low moisture ranges, respectively. There were generally no significant differences in DM losses or nutrient retention between round and square bales, bales wrapped individually or in a tube, or high and low moisture ranges. Fermentation products were significantly affected only by initial moisture content. Heating rate of the low moisture silage bales after removal from storage was acceptable, taking seven or more days to heat to 35C. Although below the moisture range usually considered acceptable for chopped silage in bunk or bag silos, preservation of bales at both moisture ranges was excellent despite the low production of desirable fermentation products.