Determination Of Appropriate Calcium Amount On Laying Quails' Feed Of Early Stage

The proposed amount of calcium in feed of laying quails are not unified at home and abroad, so this experiment was carried out to detemine approprite calcium amount on laying quails.We used single-factor test experimental design, calcium levels of each group were 2.5%, 3.0%, 3.5%, 4.0%, 4.5%, 5.0% respectively. 600 healthy laying quails were completely randomly divided into six groups,each with four replications which were 20 quails. In the trial period,record the production performance,detemination the eggs quality ,nutrient retention, and serum calcium, phosphorus, AKP and HYP.The results showed:①calcium levels varied from 2.5% to 5.0%, production performance had no significant difference(P> 0.05), but when the calcium level was 3.5%, the average egg weight had a trend of higher than other groups;②At 14-week-old,eggshell weight, eggshell relative weight was not significant among all groups (P> 0.05); eggshell thickness was not significantly different between groups 3.0%,3.5%,4.0%,4.5% (P> 0.05), but was significantly higher than that of groups 2.5%,5.0% (P <0.05); There was no significant difference on eggshell strength among groups 3.5%,4.0%,4.5%, (P> 0.05), but were significantly higher than that of groups 2.5%,3.0%,5.0% (P <0.05). At 39-week-old, eggshell weight, group 2.5% was significantly lower than groups 3.5%,4.5% (P <0.05), group 3.0% was significantly lower than group 4.5% (P <0.05), other groups had no significant difference (P> 0.05);eggshell relative weight, group 2.5% was significantly lower than groups3.0%,3.5%,4.0%,4.5%,5.0% (P <0.05), other groups had no significant difference (P> 0.05); there was no significant difference on eggshell thickness among all groups (P> 0.05);there was no significant difference on eggshell strength among groups 3.0%,3.5%,4.5%,5.0% (P> 0.05), but were significantly higher than that of groups 2.5%,4.0% (P <0.05).③when calcium level was 3.5%, apparent retention of GE and N were significantly higher than other groups (P <0.05);④different calcium levels had litter effect on rention of P (P> 0.05);⑤calcium levels varied from 2.5% to 5.0%, Ca: P changes between 5:1and 10:1, tibia was not significantly affected;⑥as levels of calcium elavated , Serum calcium, phosphorus, the AKP was lowed.⑦Take all factors into consideration, calcium level of 3.5% was best.