Effect of dietary fermentable fibre from pressed sugar-beet pulp silage onammonia emission from slurry of growing-finishing pigs

An experiment was conducted to investigate the effect of dietary fermentabl e fibre on the pH and ammonia emission from slurry of growing-finishing pig s. Commercial crossbred barrows with initial body weight of 45 kg were used . Pigs were housed in two climate chambers. Twelve groups of 14 barrows wer e assigned to one of four diets. The diets differed in the content of ferme ntable fibre by adjusting the amount of sugar-beet pulp silage (SBPS). The control diet contained no SBPS. In the other three diets tapioca was replac ed with three levels (50, 100 and 150 g/kg dry matter (DM)) of SBPS. After a 13-day adaptation period, the slurry was collected in a slurry channel fo r 7 days. A sample of this slurry was placed in a laboratory system to meas ure the pH and ammonia emission for a period of 7 days. The total volatile fatty acid (VFA) and DM concentration of the slurry incr eased as tapioca was replaced by SBPS. The ammonium concentration was not i nfluenced by SBPS. For each 50 g/kg increase of SBPS, the pH of the slurry decreased by 0.45 units and ammonia emission decreased approximately by 0.1 5. It is concluded that increasing the level of fermentable fibre in the diet of growing-finishing pigs increases slurry VFA concentration. This conseque ntly decreases the pH and ammonia emission from the slurry.