Active dry yeast supplementation benefits ruminal fermentation,bacterial community,blood immunoglobulins,and growth performance in young dairy goats,but not for intermittent supplementation  

作　　者：Jun Zhang Yuntian Yang Xinjian Lei Yannan Wang Yanhua Li Zhiqiang Yang Junhu Yao 

机构地区：[1]College of Animal Science and Technology,Northwest A&F University,Yangling 712100,Shaanxi,China [2]Fuping County Animal Husbandry Development Center,Fuping 711700,Shaanxi,China [3]Shandong Institute of Feed Quality Inspection,Jinan 250010,Shandong,China

出　　处：《Animal Nutrition》2023年第2期289-301,共13页动物营养（英文版）

基　　金：supported by the National Natural Science Foundation of China(grant number 32102570);the Key R&D Program of Shaanxi Province in China(grant number 2022ZDLNY01-11);the Chinese Universities Scientific Fund(grant numbers 2452020188,2452022252);the fellowship of China Postdoctoral Science Foundation(grant number 2021M702691).

摘　　要：This study evaluated the effects of active dry yeast(ADY)supplementation and supplementation stra-tegies on ruminal fermentation,bacterial community,blood metabolites,and growth performance in young dairy goats.Sixty young female Guanzhong dairy goats of similar age(4.00±0.50 months)and BW(19.65±0.41 kg)were randomly divided into 3 groups(n=20):(1)basal diet group(CON);(2)basal diet continuously supplemented with 3.0 g/goat per day commercial ADY(a proprietary strain of Saccharomyces cerevisiae with 5.0×10^(9)cfu/g)group(CSY);(3)basal diet with intermittently supple-mented ADY group(ISY;5 d supplementation with ADY at 4.5 g/goat per day following 5 d of no sup-plementation).The experiment lasted 67 d with the first 7 d as an adaptive period.Rumen fluid and blood samples were collected bi-weekly.Data were analyzed using the MIXED procedure combined with the SLICE option in SAS.Specific orthogonal contrasts of ADY vs.CON and CSY vs.ISY were also analyzed.During the experimental period,ADY supplementation resulted in greater DMI(P=0.03),ruminal ac-etate proportion(P<0.01)and acetylesterase activity(P=0.01),and blood contents of glucose(P=0.01)and IgM(P=0.02)and tended to have greater ADG(P=0.05)and paunch girth(P=0.06)than the CON,despite the propionate proportion(P=0.03)and contents of total protein(P=0.04)and IgA(P=0.03)being lower.The lower ruminal NH_(3)-N(P<0.01)and blood urea nitrogen(P=0.07)contents indicated greater nitrogen utilization with ADY supplementation.ADY supplementation showed persistent effects after it was stopped because the BW at 12 months of age(P=0.03)and birth weight of lambs(P=0.02)were greater than the CON.However,the ISY did not show those benefits and had significantly lower relative abundances of fiber-degrading related bacteria than the CSY.In conclusion,ADY supplementa-tion,especially continuously supplemented,may enhance ADG and ADG:DMI ratio by improving DMI,ruminal cellulolytic bacteria abundance and enzyme activity,nitrogen utilization,and immune status.These findings provide

关 键 词：Active dry yeast Bacterial community Dairy goat Growth performance Rumen microbiota Saccharomyces cerevisiae 

分 类 号：S827.5[农业科学—畜牧学]