[1] BALDWIN R L,MCLEOD K R,KLOTZ J L,et al.Rumen development,intestinal growth and hepatic metabolism in the pre-and postweaning ruminant[J].Journal of Dairy Science,2004,87(Suppl.1):E55-E65.
[2] SHAMS Z,TAHAMTAN Y,POURBAKHSH A,et al.Detection of enterotoxigenic K99(F5) and F41 from fecal sample of calves by molecular and serological methods[J].Comparative Clinical Pathology,2012,21(4):475-478.

[3] KOLENDA R,BURDUKIEWICZ M,SCHIERACK P.A systematic review and meta-analysis of the epidemiology of pathogenic
Escherichia coli of calves and the role of calves as reservoirs for human pathogenic
E. coli[J].Frontiers in Cellular and Infection Microbiology,2015,5:23.
[4] OK M,GULER L,TURGUT K,et al.The studies on the aetiology of diarrhoea in neonatal calves and determination of virulence gene markers of
Escherichia coli strains by multiplex PCR[J].Zoonoses and Public Health,2009,56(2):94-101.

[5] 左丽君,姜宁,张爱忠.丁酸钠对畜禽机体营养及免疫调控作用的研究进展[J].中国畜牧杂志,2019,55(4):25-28.
[6] WU Y N,ZHOU Y M,LU C H,et al.Influence of butyrate loaded clinoptilolite dietary supplementation on growth performance,development of intestine and antioxidant capacity in broiler chickens[J].PLoS One,2016,11(4):e0154410.
[7] SCHEPPACH W,BARTRAM P,RICHTER A,et al.Effect of short-chain fatty acids on the human colonic mucosa
in vitro[J].Journal of Parenteral and Enteral Nutrition,1992,16(1):43-48.

[8] GUILLOTEAU P,ZABIELSKI R,DAVID J C,et al.Sodium-butyrate as a growth promoter in milk replacer formula for young calves[J].Journal of Dairy Science,2009,92(3):1038-1049.

[9] GUILLOTEAU P,ZABIELSKI R,BLUM J W.Gastrointestinal tract and digestion in the young ruminant:ontogenesis,adaptations,consequences and manipulations[J].Journal of Physiology and Pharmacology,2009,60(Suppl 3):37-46.
[10] PENNER G B,ASCHENBACH J R,GÄBEL G,et al.Epithelial capacity for apical uptake of short chain fatty acids is a key determinant for intraruminal pH and the susceptibility to subacute ruminal acidosis in sheep[J].The Journal of Nutrition,2009,139(9):1714-1720.

[11] 赵会利,高艳霞,李建国,等.丁酸钠对断奶犊牛生长、血液生化指标及胃肠道发育的影响[J].畜牧兽医学报,2013,44(10):1600-1608.
[12] BEIRANVAND H,GHORBANI G R,KHORVASH M,et al.Interactions of alfalfa hay and sodium propionate on dairy calf performance and rumen development[J].Journal of Dairy Science,2014,97(4):2270-2280.

[13] GÁLFI P,BOKORI J.Feeding trial in pigs with a diet containing sodium n-butyrate[J].Acta Veterinaria Hungarica,1990,38(1/2):3-17.
[14] HILL T M,ALDRICH J M,SCHLOTTERBECK R L,et al.Effects of changing the fat and fatty acid composition of milk replacers fed to neonatal calves[J].The Professional Animal Scientist,2007,23(2):135-143.

[15] XIONG H T,GUO B X,GAN Z S,et al.Butyrate upregulates endogenous host defense peptides to enhance disease resistance in piglets via histone deacetylase inhibition[J].Scientific Reports,2016,6:27070.
[16] CHEEKE P R.Actual and potential applications of
Yucca schidigera and
Quillaja saponaria saponins in human and animal nutrition[C]//OLESZEK W,MARSTON A.Saponins in food, feedstuffs and medicinal plants.Netherlands:Springer,2000,77:241-254.
[17] 龚红,邹胜龙.丝兰提取物的研究与应用[J].饲料研究,2015(1):14-17,39.
[18] PERRON N R,BRUMAGHIM J L.A review of the antioxidant mechanisms of polyphenol compounds related to iron binding[J].Cell Biochemistry and Biophysics,2009,53(2):75-100.

[19] 田丽新,史彬林,李倜宇,等.丝兰提取物对奶牛免疫和抗氧化功能的影响[J].饲料研究,2016(3):33-35,57.
[20] DE SOUSA O A,COOKE R F,BRANDÃO A P,et al.Productive and physiological responses of feeder cattle supplemented with
Yucca schidigera extract during feedlot receiving[J].Journal of Animal Science,2019,97(1):208-219.

[21] ABDEL-RAHEEM S M,FARGHALY M M,HASSAN E H.Effect of dietary supplementation with
Yucca schidigera powder on nutrient digestibility,rumen fermentation,ruminal enzyme activities and growth performance of buffalo calves[J].Biological Rhythm Research,2019,doi:10.1080/09291016.2019.1691832.
[22] NRC.Nutrient requirements of dairy cattle[S].7th ed.Washington,D.C.:National Academy Press,2001.
[23] PAL B,PACHAURI S.Effect of oral rehydration in neonatal calves treated for diarrhoea induced with
Escherichia coli (O101:K99) infection[J].The Indian Journal of Veterinary Research,2008,17(1):19-26.
[24] BESSER T E,RICHARDS B L,RICE D H,et al.
Escherichia coli O157:H7 infection of calves:infectious dose and direct contact transmission[J].Epidemiology & Infection,2001,127(3):555-560.

[25] AOAC.Official methods of analysis of the association of official analytical chemists[S].17th ed.Washington D.C.:AOAC,2000.
[26] VAN SOEST P J,ROBERTSON J B,LEWIS B A.Symposium:carbohydrate methodology, metabolism, and nutritional implications in dairy cattle[J].Journal of Dairy Science,1991,74(10):3583-3597.

[27] GLOVER A D,PUSCHNER B,ROSSOW H A,et al.A double-blind block randomized clinical trial on the effect of zinc as a treatment for diarrhea in neonatal Holstein calves under natural challenge conditions[J].Preventive Veterinary Medicine,2013,112(3/4):338-347.
[28] SLUSARCZYK K,STRZETELSKI J,FURGA?-DIER? UK I.The effect of sodium butyrate on calf growth and serum level of β-hydroxybutyric acid[J].Journal of Animal and Feed Sciences,2010,19(3):348-357.

[29] FRIETEN D,GERBERT C,KOCH C,et al.Ad libitum milk replacer feeding,but not butyrate supplementation,affects growth performance as well as metabolic and endocrine traits in Holstein calves[J].Journal of Dairy Science,2017,100(8):6648-6661.

[30] GORKA P,KOWALSKI Z M,PIETRZAK P,et al.Effect of sodium butyrate supplementation in milk replacer and starter diet on rumen development in calves[J].Journal of Physiology and Pharmacology,2009,60(Suppl.3):47-53.
[31] GORKA P,KOWALSKI Z M,PIETRZAK P,et al.Effect of method of delivery of sodium butyrate on rumen development in newborn calves[J].Journal of Dairy Science,2011,94(11):5578-5588.

[32] KOCH C,GERBERT C,FRIETEN D,et al.Effects of ad libitum milk replacer feeding and butyrate supplementation on the epithelial growth and development of the gastrointestinal tract in Holstein calves[J].Journal of Dairy Science,2019,102(9):8513-8526..

[33] O'LOUGHLIN E V,SCOTT R B,GALL D G.Pathophysiology of infectious diarrhea:changes in intestinal structure and function[J].Journal of Pediatric Gastroenterology and Nutrition,1991,12(1):5-20.

[34] BI Y L,YANG C T,DIAO Q Y,et al.Effects of dietary supplementation with two alternatives to antibiotics on intestinal microbiota of preweaned calves challenged with
Escherichia coli K99[J].Scientific Reports,2017,7(1):5439.
[35] GUILLOTEAU P,MARTIN L,EECKHAUT V,et al.From the gut to the peripheral tissues:the multiple effects of butyrate[J].Nutrition Research Reviews,2010,23(2):366-384.

[36] PATRA A K,STIVERSON J,YU Z.Effects of
Quillaja and
Yucca saponins on communities and select populations of rumen bacteria and archaea,and fermentation
in vitro[J].Journal of Applied Microbiology,2012,113(6):1329-1340.

[37] CADENAS E,DAVIES K J A.Mitochondrial free radical generation,oxidative stress,and aging[J].Free Radical Biology and Medicine,2000,29(3/4):222-230.
[38] MOORE J W,BABIDGE W,MILLARD S,et al.Effect of sulphide on short chain acyl-CoA metabolism in rat colonocytes[J].Gut,1997,41(1):77-81.

[39] SAUER J,RICHTER K K,POOL-ZOBEL B L.Physiological concentrations of butyrate favorably modulate genes of oxidative and metabolic stress in primary human colon cells[J].The Journal of Nutritional Biochemistry,2007,18(11):736-745.

[40] MRUK D D,SILVESTRINI B,MO M Y,et al.Antioxidant superoxide dismutase-a review:its function,regulation in the testis,and role in male fertility[J].Contraception,2002,65(4):305-311.

[41] BOWLER C,SLOOTEN L,VANDENBRANDEN S,et al.Manganese superoxide dismutase can reduce cellular damage mediated by oxygen radicals in transgenic plants[J].The Embo Journal,1991,10(7):1723-1732.

[42] CIGERCI I H,FIDAN A F,KONUK M,et al.The protective potential of
Yucca schidigera (Sarsaponin 30) against nitrite-induced oxidative stress in rats[J].Journal of Natural Medicines,2009,63(3):311-317.

[43] ZHU L H,ZHAO K L,CHEN X L,et al.Impact of weaning and an antioxidant blend on intestinal barrier function and antioxidant status in pigs[J].Journal of Animal Science,2012,90(8):2581-2589.

[44] SEBAI H,JABRI M A,SOULI A,et al.Antidiarrheal and antioxidant activities of chamomile (
Matricaria recutita L.) decoction extract in rats[J].Journal of Ethnopharmacology,2014,152(2):327-333.