We compared a 3-and 5-phase feeding program in terms of ammonia concentrations measured at litter level,litter composition and quality,nitrogen(N)utilization,performance,welfare,and meat deposition in broilers.A total of 744 Ross 308 male broilers was divided into 2 treatments,each with 6 replicates.The 3-phase diets were formulated to CP and digestible lysine contents of 205 and 11.5 g/kg(0 to 9 d),195 and 10.8 g/kg(9 to 24 d),and 183.3 and 10.15 g/kg(24 to 39 d),respectively.The 5-phase diets had additional phases from 17 to 24 d and 32 to 39 d with CP and digestible lysine contents of 188 and 10.4 g/kg and 177 and 9.8 g/kg,respectively.Feeding 5 phases reduced the NH3 concentrations at litter level by 37.95％and 20.81％at 23(P＜0.05)and 37 d of age(P＜0.05),respectively.There was a tendency for a lower litter total ammoniacal nitrogen concentration for the 5-phase treatment than the 3-phase treatment at 24 and 39 d of age(P＜0.1 for both).Total N concentration of the litter also tended to be lower for the 5-phase treatment at 39 d of age(P＜0.1).The lower NH3 coincided with a lower average litter pH at 24 and 32 d of age(P＜0.05 for both).Birds fed the 5-phase treatments had a lower incidence of foot lesions at 24 d of age(P＜0.001).Performance as well as carcass yield could be maintained,except for FCR,which was higher for the 5-phase treatment between 17 and 24 d of age and the overall period(P＜0.05 and＜0.001,respectively).The impact of the 5-phase treatment regarding the utilization of N(digestibility,excretion,and retention)was less clear,however the NH3 volatilized from the litter was significantly reduced.Feeding 5 phases may therefore potentially reduce the NH3 emitted from broiler houses which has several environmental and health benefits.Although the 5-phase treatment resulted in a significant decrease in feed efficiency,growth performance and meat deposition were maintained.

Madri Brink;Geert P.J.Janssens;Evelyne Delezie

Flanders Research Institute for Agriculture,Fisheries and Food(ILVO),Animal Sciences Unit,Scheldeweg 68,9090 Melle,Belgium;Department of Veterinary and Biosciences,Ghent University,Heidestraat 19,9820 Merelbeke,Belgium

动物营养（英文）

[1]Madri Brink;Geert P.J.Janssens;Evelyne Delezie-.Does feeding more phases reduce ammonia concentrations from broiler litter?)[J].动物营养（英文）,2022(04):152-159

ammoniacal,volatilized

Does,feeding,more,phases,concentrations,from,litter,We,compared,program,terms,measured,level,composition,quality,nitrogen,utilization,performance,welfare,meat,deposition,broilers,total,Ross,male,was,divided,into,treatments,each,replicates,diets,were,formulated,CP,digestible,lysine,contents,respectively,had,additional,Feeding,reduced,NH3,by,There,tendency,lower,than,both,Total,also,tended,coincided,average,Birds,fed,incidence,foot,lesions,Performance,well,carcass,yield,could,maintained,except,FCR,which,higher,between,overall,period,impact,regarding,digestibility,excretion,retention,less,clear,however,significantly,may,therefore,potentially,emitted,houses,several,environmental,health,benefits,Although,resulted,decrease,efficiency,growth

0.433289