Abstract:

In order to compare the nutrient composition of meet between Yanbian Yellow bulls and steers,16 healthy beef cattles from same breed group with similar age and body weight were chosen and randomly divided into two groups with 8 cattles per group.The experimental group was made up by steers and control group was bulls,all cattles were slaughtered after feed for 373 d.The results showed that:① At the early stage of experiment,the total protein,globulin,A/G,blood glucose,triglyceride,aspertate aminotransferase,alanine aminotransferase levels of the two groups had no significant difference (P>0.05),and albumin,high-density lipoprotein cholesterol, urea nitrogen and cholesterol of experimental group were extremely significantly or significantly higher than that of control group (P<0.01;P<0.05);At the end of the experiment,albumin,A/G and cholesterol of experimental group were significantly higher than the control group (P<0.05),and the triglycerides content was extremely significantly higher than control group (P<0.01);There was no significant difference in other indexes between the two groups (P>0.05);② The oleic acid content and C18:1 n9/C18:2 n6 in longissimus dorsi of experimental group were 6.51% and 229.42% higher than that in control group,the difference were significant or extremely significant (P<0.05;P<0.01),respectively.The linolic acid and octadecoic acid in control group were extremely significantly higher than that of experimental group (P<0.01);③The proportion of Pro,Gly,Ala and Arg in longissimus dorsi of control group were significant higher than that in experimental group (P<0.05),while other amino contents were no significant difference between two groups (P>0.05).In conclusion,the fat deposition,unsaturated fatty acid,especially oleic acid content in Yanbian Yellow steers were significantly higher than bull and it had good meat quality and good taste which was suitable for the production of high-grade beef.

Key words: Yanbian Yellow cattle; bull; steer; fatty acids; amino acids