The effect of benzoic acid concentration on nitrogen metabolism, manure ammonia and odour emissions in finishing pigs

作者：Murphy D P; O'Doherty J V; Boland T M; O'Shea C J; Callan J J; Pierce K M; Lynch M B^*

来源：Animal Feed Science and Technology, 2011, 163(2-4): 194-199.

DOI：10.1016/j.anifeedsci.2010.10.009

• Ammonia
• Benzoic acid
• Odour
• Pigs

A complete randomised block design experiment was conducted to investigate the effects of benzoic acid inclusion level on nitrogen (N) metabolism, and manure ammonia (NH(3)) and odour emissions in finishing pigs. Sixteen boars (64 kg live weight +/- 1.5 kg) were assigned to one of four dietary treatments (T) varying in benzoic acid concentration: (T1) 0 g benzoic acid/kg (as fed); (12) log benzoic acid/kg: (T3) 20 g benzoic acid/kg; (14) 30 g benzoic acid/kg. Animals were housed in individual metabolism crates and feed was provided ad libitum. All diets were formulated to have similar concentration of digestible energy and ileal digestible lysine with benzoic acid replacing wheat in the diet. There was a linear decrease in NH(3) emission (P<0.001), as the dietary benzoic acid concentration increased (141.4 mg/g versus 40.5 mg/g N intake (S.E.M. 12.1) over the 240-h storage period). However, there was no effect (P>0.05) of benzoic acid on odour concentration. Urinary nitrogen (N) excretion, total N excretion and the urinary:faecal N ratio were linearly reduced (P<0.05) with increasing benzoic acid inclusion. Furthermore. N retention increased linearly (P<0.05) as benzoic acid concentration increased from 0 g/kg to 30 g/kg in the diet. In conclusion, the inclusion of benzoic acid in the diet of finishing pigs has the potential to reduce total and urinary N excretion and the urinary to faecal N ratio. This was mirrored by reductions in manure NH(3) emissions in the benzoic acid supplemented treatments.

• 出版日期2011-2-11