Effects Of Zinc Methionine Supplemented On Performance And Biochemical Parameters In Rex Rabbits

The objections of this study are to determine the effects of different levels of Zinc-Methionine(Zn-Met)supplemented on performance,biochemical parameters in REX rabbit,and find out the suitable dose.Forty healthy,born about 60 days REX rabbits,which had the adjacent body weight, were divided into 4 groups,three repeats of each group,three rabbits of each repeat and the remained one used in necessary.Groups were feeded with routine(Zn27.41 mg/kg DM),among which,the first group was used to as the control group(routine dietary)andⅠ,Ⅱ,Ⅲgroups were added 40 mg/kg,80 mg/kg,120 mg/kg Zn-Met in basic dietary. Pretesting-date was 7 days.In the experimental stage,adopting the quantitative methods with 150g feeds every day.The testing methods and targets were shown as below: Recorded body weights in 0^th,15^th,30^th,45^thday;Blood and tissue samples were adopted at the 45^thday.In the experimental stage,registering the body weight,the used feeds,blood and tissue dates.The above targets were all took general average as indexs judging the effects of Zn-Met on REX rabbit.The results as follows:Effects on performance:Average daily gain(ADG)of groupⅠ,Ⅱ,Ⅲwere improved by a cretain extent comparing With the control group.and the highest group was the groupⅡ.The ADG of the groupⅠ,Ⅱ,Ⅲwere 19.74 g/d,20.69 g/d,20.66 g/d,repectively,were 6.94%,12.08%,11.92%significantly higher than control group(18.46g/d)(P＜0.01),but no significant difference(P＞0.05)among the groupⅡ,Ⅲ.But the groupⅡ,Ⅲwere significant difference(P＜0.01)compared with control group.The highest group of feed-meat ratio was groupⅡ,compared with control group(P＜0.01)and compared with groupⅠ(P＜0.05),but but no significant difference(P＞0.05)with the groupⅢ.With the augment of the levels of supplemented Zn-Met,the density of hair and the area of fur of the groupⅠ,Ⅱ,Ⅲwere higher than control group,but no significant difference(P＞0.05).Effects on blood parameters:The content of serum Zinc of groupⅠ,ⅡandⅢwere 30.90μmol/L,36.23μmol/L and 41.02μmol/L,respectively,were 15.30%,35.19%,53.06%significantly higher than control group(26.80μmol/L)(P＜0.05),but no significant difference(P＞0.05)among the groupⅡ,Ⅲ.But the groupⅡ,Ⅲwere higher than control group and the groupⅠ(P＜0.05).The content of AKP in serum were 5.18%,9.85%,4.20%significantly higher than control group.The content of AKP of groupⅡwere significantly higher than the groupⅢ(P＜0.05),and the groupⅡ,Ⅲwere significant difference(P＜0.01)compared with control group.The content of SUN in serum were not significantly difference(P＞0.05)between the trial and control groups,but the higher group of SUN was the control group.With the augment of the levels of supplemented Zn-Met, the serum TP increased no significantly difference from group(P＞0.05).And the serum ALB of groupⅡhad the significantly difference with the control group(P＜0.05).Effects on the content of zinc,copper,iron in different tissue:The average content of zinc in liver of the groupⅠ,Ⅱ,Ⅲwere 33.27 mg/kg,42.22 mg/kg,39.51 mg/kg,repectively,were 64.16%,58.90%,48.70%significantly higher than control group(26.57 mg/kg),but no significant difference(P＞0.05)among the groupⅠ,Ⅱ,Ⅲ.The groupⅡ,Ⅲhad the significant difference with the control group(P<0.05).The highest group of content of zinc in kinney and muscular was the groupⅢ(P＜0.05).With the augment of the levels of supplemented Zn-Met,the content of zinc in tibia increased no significantly difference from group(P＞0.05),but the extent went down gradually.The average contents of cooper and iron in tissues of the groupⅠ,Ⅱ,Ⅲwere higher than the control group,but no significant difference(P＞0.05),except the groupⅡand the control group in liver (P＞0.05).Results shown that,supplementing Zn-Met in dietary had some certain promotion on the performance in rabbit.Analysis indicated that,the 80 mg/kg supplementing amount was the best in the normal dietary(Zn27.41 mg/kg DM)and could be used as reference data of the Zn supplementing amount in dietary.