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

机译：苯甲酸浓度对育肥猪氮代谢，粪肥氨和臭气排放的影响

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A complete randomised block design experiment was conducted to investigate the effects of benzoic acid inclusion level on nitrogen (N) metabolism, and manure ammonia (NH3) 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 NH3 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 NH3 emissions in the benzoic acid supplemented treatments
机译：进行了完整的随机区组设计实验，以研究苯甲酸包合水平对肥育猪的氮（N）代谢，粪肥氨（NH3）和气味排放的影响。将十六只公猪（64公斤活重+/- 1.5公斤）分配给四种饮食疗法（T）之一，其苯甲酸浓度不同：（T1）0克苯甲酸/千克（饲喂）; （12）对数苯甲酸/ kg：（T3）20 g苯甲酸/ kg; （14）30克苯甲酸/千克。将动物关在单独的代谢箱中，并随意提供饲料。所有日粮均配制为具有相似浓度的可消化能量和回肠可消化赖氨酸，用日粮中的苯甲酸代替小麦。随着日粮中苯甲酸浓度的增加（在240小时的存储时间内，N摄入量为141.4 mg / g相对于N摄入量为40.5 mg / g，S.E.M。12.1），NH3排放量呈线性下降（P <0.001）。但是，苯甲酸对气味浓度没有影响（P> 0.05）。随着苯甲酸含量的增加，尿中氮（N）的排泄，总氮（N）的排泄和尿液：粪便氮的比例线性降低（P <0.05）。此外。日粮中苯甲酸浓度从0 g / kg增加到30 g / kg时，氮的保留量呈线性增加（P <0.05）。总之，在肥育猪的日粮中添加苯甲酸有可能减少总氮和尿N的排泄以及尿与粪便N的比率。这可以通过补充苯甲酸的肥料减少粪便中的NH3排放来反映

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