The influence of the method of barley inclusion(fine,coarse and whole barley)in a wheat-based diet and protease supplementation(0 and 0.20 g/kg)on growth performance,nutrient utilisation and gastroin-testinal tract development of broilers(d 1 to 21)was evaluated in a 3×2 factorial arrangement.Whole barley(WB)grains were ground in a hammer mill to pass through the screen sizes of 2.5 and 8.0 mm to achieve fine(FB)and coarse(CB)barley particle sizes,respectively.A total of 288,one-day-old male broilers were allotted to 36 cages(6 cages/treatment;8 birds/cage).There was no significant(P＞0.05)interaction between barley inclusion method and protease for any growth performance or nutrient utilisation parameters.Birds fed diets containing CB and WB showed higher(P＜0.05)weight gain,and digestibility of dry matter,nitrogen,calcium,gross energy,and ileal digestible energy compared to those fed FB diets.Compared to the birds fed FB diets,feed per gain was lower(P＜0.05)in birds fed diets made of WB.Fat digestibility of the birds fed CB was higher(P＜0.05)than those fed FB and WB birds.Compared to FB and CB diets,inclusion of WB resulted in heavier(P＜0.05)gizzards but reduced(P＜0.05)gizzard pH.Supplemental protease,however,had no effects(P＞0.05)on growth performance and nutrient utilisation,most likely due to the well balanced digestible amino acids and high inherent digestibility of protein in the basal diet,and/or the presence of exogenous carbohydrase and phytase.In conclusion,the present results showed that the inclusion of coarsely ground and whole barley in a wheat-based diet can enhance nutrient and energy utilisation and is beneficial to the growth perfor-mance of young broilers.

Lindon M.Tari;Nipuna Perera;Faegheh Zaefarian;M.Reza Abdollahi;Aaron J.Cowieson;Velmurugu Ravindran

Monogastric Research Centre,School of Agriculture and Environment,Massey University,Private Bag 11 222,Palmerston North,4442,New Zealand;Department of Animal Science,Faculty of Agriculture,University of Peradeniya,Peradeniya,20400,Sri Lanka;DSM Nutritional Products,Wurmisweg 576,Kaiseraugst,Switzerland

动物营养（英文）

[1]Lindon M.Tari;Nipuna Perera;Faegheh Zaefarian;M.Reza Abdollahi;Aaron J.Cowieson;Velmurugu Ravindran-.Influence of barley inclusion method and protease supplementation on growth performance,nutrient utilisation,and gastrointestinal tract development in broiler starters)[J].动物营养（英文）,2022(01):61-70

starters,gastroin,gizzards,gizzard,carbohydrase,phytase

Influence,barley,inclusion,method,protease,supplementation,growth,performance,nutrient,utilisation,gastrointestinal,tract,development,influence,fine,whole,wheat,broilers,was,evaluated,factorial,arrangement,Whole,WB,grains,were,ground,hammer,mill,pass,through,screen,sizes,achieve,FB,CB,particle,respectively,total,one,day,old,male,allotted,cages,treatment,birds,There,significant,interaction,between,any,parameters,Birds,fed,diets,containing,showed,higher,weight,gain,digestibility,dry,matter,nitrogen,calcium,gross,energy,ileal,digestible,compared,those,Compared,feed,lower,made,Fat,than,resulted,heavier,but,reduced,Supplemental,however,had,effects,most,likely,due,well,balanced,amino,acids,inherent,protein,basal,presence,exogenous,conclusion,present,results,that,coarsely,enhance,beneficial,young

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