The objective of this experiment was to investigate the effects of inclusion of dragon fruit peel pellet(DFPP)and dietary non-protein nitrogen(NPN)on nutrients digestibility,rumen fermentation efficiency,plasma antioxidant activity,microbial protein synthesis,milk yield and composition in lactating Holstein-Friesian crossbred cows.Four animals were randomly allotted to 4 dietary treatments according to a 2×2 factorial arrangement in 4×4 Latin square design.The treatments were as follows:300 g DM of DFPP+100 g of urea(T1),300 g DM of DFPP+200 g of urea(T2),400 g DM of DFPP+100 g of urea(T3),and 400 g DM of DFPP+200 g of urea(T4),respectively.The results showed that intake of rice straw was increased(P＜0.01)by the DFPP addition.Including DFPP and urea did not affect(P＞0.05)the NDF and ADF digestibilities,but increased the apparent digestibilities of dry matter,organic matter,and crude protein(P＜0.01).Rumen fermentation process,especially the propionate concentration,was significantly increased by the DFPP levels.The plasma antioxidant activity was increased(P＞0.05)with the addition of DFPP.The DFPP improved(P＜0.01)microbial protein synthesis.The supplementation of DFPP and urea increased(P＜0.05)milk fat,whereas milk yield and 3.5％fat corrected milk were only increased(P＜0.05)by the DFPP supplementation.Based on these results,addition of DFPP at 400 g/animal per day with urea at 100 g/animal per day improved rumen fermentation,plasma antioxidant activity,milk yield and milk fat percentage.

Maharach Matra;Metha Wanapat

Tropical Feed Resources Research and Development Center(TROFREC),Department of Animal Science,Faculty of Agriculture,Khon Kaen University,Khon Kaen 40002,Thailand

动物营养（英文）

[1]Maharach Matra;Metha Wanapat-.Phytonutrient pellet supplementation enhanced rumen fermentation efficiency and milk production of lactating Holstein-Friesian crossbred cows)[J].动物营养（英文）,2022(02):119-126

Phytonutrient,Friesian,crossbred,DFPP+100,DFPP+200,digestibilities

pellet,supplementation,enhanced,rumen,fermentation,efficiency,milk,production,lactating,Holstein,cows,objective,this,experiment,was,investigate,effects,inclusion,dragon,fruit,peel,dietary,protein,nitrogen,NPN,nutrients,digestibility,plasma,antioxidant,activity,microbial,synthesis,yield,composition,Four,animals,were,randomly,allotted,treatments,according,factorial,arrangement,Latin,square,design,follows,DM,urea,T4,respectively,results,showed,that,intake,rice,straw,increased,by,addition,Including,did,not,affect,NDF,ADF,but,apparent,dry,matter,organic,crude,Rumen,process,especially,propionate,concentration,significantly,levels,improved,fat,whereas,corrected,only,Based,these,day,percentage

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