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《Pratacultural Science》 2017-12
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Effects of Bupleurumextract on the performance and blood metabolism in heat-stressed dairy cows

Fan Cai-yun;Su Di;Shi Bao-lu;Li Xiao-jiao;Zhang Yang-dong;Zhang Xing-kai;Wang Xiu-min;Zhang Yun-hai;Cheng Jian-bo;College of Animal Science and Technology,Anhui Agricultural University;Institute of Animal Science,Chinese Academy of Agricultural Sciences;Shanghai Bright Holstan Co.,Ltd.;Beijing Centre Biology Co.,Ltd.;  
This experiment was conducted to evaluate the effects of Bupleurum extract(BE)on the performance and blood metabolism in dairy cows under heat stress.Forty-eight lactating Holstein cows were randomly assigned to one of four 2.5 treatments based on their dry matter intake(DMI),milk yield,and parity.Treatments consisted of 0,0.5,2.5 and 5.0 g·kg~(-1) BE,supplemented over a trial period of 10 weeks.Supplementation of BE affected the rectal temperature,DMI,milk yield,milk protein yield,and somatic cell score of the test subjects in a quadratic manner,and the peak values were reached at a dose of 0.5 g·kg~(-1) BE.Milk urea nitrogen concentration,milk fat,total solid content,and blood urea nitrogen,albumin,total cholesterol,highdensity lipoprotein cholesterol,andβ-hydroxybutyricacid were decreased(P0.05)linearly,and triglyceride was increased(P0.05)linearly with increasing BE doses.Compared to the control,the blood urea nitrogen concentration increased(P=0.05)in cows fed 2.5 or 5.0 g·kg~(-1) of BE.Compared to cows fed 0 or 0.5 g·kg~(-1) of BE,serum total cholesterol and high-density lipoprotein cholesterol levels increased in cows fed 5.0 g·kg~(-1) of BE.Therefore,the appropriate supplemental BE level for heat-stressed dairy cows is 0.5 g·kg~(-1),and the safe dosage of BE is no more than 5.0 g·kg~(-1).
【Fund】: 国家重点研发计划(2016YFD0500503);; 现代农业产业技术体系专项资金(CARS-37);; 安徽省国际科技合作计划项目(1503062019)
【CateGory Index】: S858.23
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