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Two trials were carried out to determine the effect of manure handling systems on the performance of growing-finishing pigs when ventilation rate was governed by temperature. The first trial compared accumulated manure (1-m-deeppit) and subsequent evacuation from under slats versus continuous gravity manure flow. The second trial compared gravity manure flow (control) versus flushing with either fresh, aerobically or anaerobically stored manure. Significant differences were not found among the environmental parameters or pig performance on the first trial. In the second trial, higher levels of carbon dioxide were noted in all the flushed rooms. Ammonia levels were higher when flushing was done with anaerobically stored manure while flushing with fresh manure resulted in highly variable but large increases in hydrogen sulphide. The pH of the manure in the control rooms was always lower than for the flushed rooms. These environmental modifications did not result in differences in animal health status or in pig performance. Therefore, pigs could be raised and finished on partially slatted floors using any of the manure handling systems described here without detrimental effects.
effect of manure handling on air quality and pig performance in partially slatted floor barns
Bate, L.A., Hacker, R.R. and P.A. Phillips 1988. EFFECT OF MANURE HANDLING ON AIR QUALITY AND PIG PERFORMANCE IN PARTIALLY SLATTED FLOOR BARNS. Canadian Agricultural Engineering 30(1):107-110.
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