| In order to research the effect on growing and fattening performance of Yanbian Yellow Cattles, we selected 16 healthy beef cattles from same breed group with similar age and weight as trail animals, dividing them into two groups randomly and each group had 8 cattles. One was steer group and the other was bull group. Based on the same feed and feeding for 373d to observe the effect on body weight and body size increasing, blood index and meat profile. It shows that:1.Body weight:When grew up to 21 months, the bull groups weight was 4.40% higher than the steer group,and the difference was significant (P<0.05); at month of 24, the end weight was 542.28 kg and 488.63 kg, respectively, the difference was extremely significant (P<0.01), and the bull group was 11% higher; the day-average augmented weight between bull group and steer group was 0.71 kg and 0.57 kg respectively, extremely significant (P<0.01), and bull group was 25.4% higher than steer group. And in every month except 21st month, bull group average augmented weight was higher than steer group, and the difference trended to get bigger as time passed, which proved that the weight of bull group grew faster and faster than steer group in later-growing period.In bulls group the end weight and average day weight was significantly higher than that in steers group(P<0.01);2.Body size:From age 12th month to 24th month, all body indexes were raising. From 18th month on, the body height of Yanbian yellow bulls was growing faster, and at age 24th month the index of bulls was 2.15% higher than that of steers, the difference was significant(P<0.05);From 18th month on, the body length of Yanbian yellow bulls was growing faster, and at age 24th month the index of bulls was 3.25% higher than that of steers, the difference was significant(P<0.05); ankle circumference of bulls grew faster than that of steers, at age 15th month and 24th month, the index of bulls was 2.76% and 7.07% higher than that of steers,respectively, the difference was significant (P<0.05),at age 18th month and 21th month, the index of bulls was 5.44% and 5.80% higher than that of steers, the difference was extremely significant (P<0.01); from age 18th month, the chest circumference of bulls grew faster than the steers, at age 21th month and 24th month, the index of bulls was 2.05% and 1.56% higher than that of steers, respectively,the difference was significant(P<0.05);at age 21th month and 24th month, the chest weidth of bulls was 3.74% and 3.75% higher than that of steers, respectively,the difference was significant (P<0.05); the ischia width of steers was significantly 8.65% higher than bulls (P<0.05).3.Feed using ratio:the feeder reward of bull group and steer group was 15.86 and 19.26, respectively, and it was 17.52% significantly higher in bull group than that in steer group(P<0.05).4. Blood Index:from 12th month to 24th month, there was no significant difference in TP content between two trial groups (P>0.05); at age 12,15,21,24 month, the ALB content of steer group was higher than that of bull group (P<0.05);there was no significant difference of the serum albumin content in every month (P>0.05); and A/G value of steer group at age of 12,15,18 month was significantly higher than that of bull group (P<0.05),and at age 24 month the difference was significant (P<0.01); The serum HDL (high density lipoprotein)of steer group was higher than that of bull group in every period, and the differences at age 12,18 month was notable(P<0.05); the BUN content of steer group at age 12,18,21 month was higher than that of bull group, and the difference was notable (P<0.05), and BUN content trended to raise as time passed; the serum TG (triglyceride) content of steer group was higher than that of bull group in every month, and it was significantly different at age of 21 month(P<0.05) and the difference was extreme at age 24(P<0.01); serum Chol(cholesterol) content of steer group was higher than that of bull group, and at age 12,18,24 month, the difference was notable (P<0.05);the GOT content of bull group was higher than that of steer group, and at age 18 and 24 month, the difference was notable (P<0.05), and the GOT content was highest in both groups at age 18;the GPT content of steer group was higher than that of bull group, and at age 18 month (P<0.05), the difference was notable (P<0.05), and the GPT content was highest in both groups at age 21.5. Index of naked body and meat profile1.)The naked body weight of bull group was higher than that of steer group, the difference was notable significantly (P<0.01); the Abatage proportion and muscular apparatus area of bull group were higher than that of bull group, but there no significant difference between the two groups (P>0.05).2.)The muscle meat color, the marble, the content of intramuscularly fat in steer group was higher than that in bull group, the difference is significant(P<0.05); the content of crude proteinum in bull group was 4.41% higher than that in steer group, the difference was significant (P<0.05).3.)In back longest muscle,the oleic acid content in steer group was 15.19% higher than that in bull group(P<0.05); linolic acid in bull group was significantly 216.91% higher than that in steer group(P<0.01); the value of oleic/linolic in steer group was significantly 229.42% higher than that in bull group (P<0.01); octadecoic acid in bull group was significantly 34.49% higher than that in steer group (P<0.01).4.)The proportion of Pro(proline), Gly(glycocine), Ala(alanine) and Arg(arginine) in back longest muscle in bull group were higher than that in steer group, the differences were notable(P<0.05); other amino and the content of essentialamino acids and total un-essentialamino acids in back longest muscle of bull group were no significant difference between two groups. (P>0.05)... |
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