J. Anim Sci.
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Journal of Animal Science, Vol 76, Issue 4 1123-1130, Copyright © 1998 by American Society of Animal Science

CLINICAL TRIAL

Influence of dietary factors on the pH and ammonia emission of slurry from growing-finishing pigs

T. T. Canh, A. J. Aarnink, M. W. Verstegen and J. W. Schrama
Department of Livestock Engineering, DLO Institute of Agricultural and Environmental Engineering (IMAG-DLO), Wageningen, The Netherlands.

We investigated the effects of dietary factors on the pH and the ammonia emission from slurry of growing-finishing pigs. Sixteen male hybrid pigs (80 to 90 kg BW) were allotted to one of four diets based on barley-wheat, tapioca, barley-tapioca, and sugar beet pulp. Diets were formulated to have similar NE and CP contents and a similar lysine:NE ratio. Diets differed in nonstarch polysaccharide content (NSP) and dietary electrolyte balance (dEB). Urine and feces were daily collected quantitatively in metabolism cages and mixed as a slurry at the end of the collection period. After mixing, the pH and the ammonia emission from the slurry were measured daily in a laboratory setup for 7 d at 20 degrees C. The type of diet affected the pH of the slurry and the ammonia emission (P < .001). The pH of the slurry from pigs fed the sugar beet pulp-based diet was .8 unit lower and ammonia emission was 52 to 53% lower than that of the other three diets. The low dEB and high NPS sugar beet pulp-based diet increased the VFA concentration and reduced the pH and ammonia emission from the slurry. We conclude that dietary NSP and dEB influence the pH and ammonia emission from slurry of growing-finishing pigs.


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