China Animal Husbandry and Veterinary Medicine ›› 2019, Vol. 46 ›› Issue (12): 3581-3589.doi: 10.16431/j.cnki.1671-7236.2019.12.015

• Animal Nutrition and Feed Science • Previous Articles     Next Articles

Effects of Different Conjugated Linoleic Acid Levels on Serum Biochemical Parameters and Muscle Fatty Acids in Eliminated Angus Cows

LIU Huanhuan1, GUO Yanhua1, ZHANG Qiaoe1, FENG Yuan2, LIANG Xiaojun3   

  1. 1. School of Agriculture, Ningxia University, Yinchuan 750021, China;
    2. Ningxia Hui Autonomous Region Animal Husbandry Workstation, Yinchuan 750000, China;
    3. Institute of Animal Science, Ningxia Academy of Agricultural and Forestry Sciences, Yinchuan 750002, China
  • Received:2019-07-05 Online:2019-12-20 Published:2019-12-21

Abstract: The aim of this experiment was to study the effects of different conjugated linoleic acid (CLA) levels on serum biochemical parameters and muscle fatty acid composition of eliminated Angus cows.The method of complete random design was adopted,forty healthy 22 months old Angus cows with body weight (417.70±30.83) kg were randomly divided into four groups with 10 cows each.The diet of control group did not add CLA,while of the experimental groups added 0.5% (0.5% CLA group),1.0% (1.0% CLA group) and 1.5% (1.5% CLA group) CLA,respectively.The experiment lasted for 105 days,which consisted of 15 days of per-feeding period and 90 days of formal period.At the end of experimental,three cows were randomly selected from each group for collect blood and slaughter,and measure serum total cholesterol (TC),triglyceride (TG),high density lipoprotein (HDL),low density lipoprotein (LDL),growth hormone (GH),insulin (INS),adiponectin (ADPN),leptin (LEP) and muscle fatty acid contents.The results showed as follows:There were no significant differences in serum TC,TG,HDL,LDL,GH,ADPN and LEP among the groups (P>0.05).The INS levels in control group and 1.0% CLA group were significantly lower than those in groups 0.5% and 1.5% CLA (P<0.05),but there was no significant difference between 0.5% CLA group and 1.5% CLA group (P>0.05).The dietary CLA supplementation had an effect on fatty acid content in muscle of elimination Angus cows.Compared with the control group,the content of C14:0 in 0.5%,1.0% and 1.5% CLA groups and the content of C16:0 in 1.0% CLA group significantly decreased (P<0.05),and the contents of C14:0 and C16:0 in 1.0% CLA groups were the lowest;The contents of C18:1n9c and monounsaturated fatty acids (MUFA) in 1.0% CLA group and C18:2n6c and polyunsaturated fatty acids (PUFA) in 1.0% CLA group and 1.5% CLA group significantly increased (P<0.05),and the content of unsaturated fatty acids in 1.0% CLA group was the highest.It could be seen that 1.0% CLA supplementation could reduce the serum INS level,whereas increase the content of MUFA and PUFA in beef,accordingly,improve beef quality of elimination Angus cows.

Key words: conjugated linoleic acid; elimination Angus cows; serum biochemical parameters; fatty acids

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