Abstract
Potato by-products represent a significant ruminant livestock feed resource in potato growing regions. Three studies were conducted to determine the effect of dry matter (DM) and storage system on silage quality and effluent loss of potato silage. The storage treatments were either: contained system (CS) or a system where effluent was allowed to escape (ES). Dry matter treatments (hay addition on a wt:wt basis) were: (1) 100% potato; (2) 92% potato: 8% hay; (3) 85% potato: 15% hay; and (4) 77% potato: 23% hay. The ES silage had a higher pH than CS indicating enhanced fermentation in the contained system. Dry matter also affected pH with treatment 1 having the highest and treatments 3 and 4 the lowest pH at day 60. However, treatment 4 had the slowest decline in pH through the second week of the trial. Ash content was lower in ES than CS. Ca, P, K and CP were generally higher in CS than ES with a significant interaction between DM and storage treatment. Cumulative effluent losses represented 45.5, 15.5, 9.2 and 1.2% of the initial weight. Effluent losses in the ES system for treatment 1 represented an excessive loss of nutrients.
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