饲粮中颗粒与粉状石粉比例对笼养蛋鸭产蛋性能、蛋品质、血清生化指标及胫骨指标的影响

Effects of Dietary Particulate to Ground Limestone Ratio on Laying Performance,Egg Quality,Serum Biochemical Indices and Tibia Indices of Cage-Rearing Laying Ducks

本试验旨在研究饲粮中颗粒与粉状石粉比例对笼养蛋鸭产蛋性能、蛋品质、血清生化指标及胫骨指标的影响。试验选取29周龄、体重相近的临武鸭200羽,随机分为5个组,每组5个重复,每个重复8羽。Ⅰ组、Ⅱ组、Ⅲ组、Ⅳ组和Ⅴ组分别饲喂含100%粉状、25%颗粒+75%粉状、50%颗粒+50%粉状、75%颗粒+25%粉状和100%颗粒石粉的饲粮(各组钙水平均为3.52%)。试验期63 d。结果表明:1)Ⅲ组和Ⅳ组合格蛋率显著高于Ⅰ组(P<0.05)。2)Ⅲ组和Ⅳ组蛋壳强度显著高于Ⅰ组和Ⅱ组(P<0.05),Ⅴ组蛋壳强度显著高于Ⅰ组(P<0.05)。3)Ⅳ组血清钙含量显著高于Ⅰ组和Ⅱ组(P<0.05),Ⅲ组、Ⅳ组和Ⅴ组血清碱性磷酸酶(AKP)活性显著低于Ⅰ组和Ⅱ组(P<0.05)。4)饲粮中颗粒与粉状石粉比例对笼养蛋鸭胫骨各指标均无显著影响(P>0.05)。由此可见,饲粮中颗粒与粉状石粉比例可改变蛋鸭的合格蛋率和蛋壳强度,进而影响血清钙含量以及AKP活性。综合考虑各项指标,在保证饲粮钙水平一致的情况下,产蛋高峰期笼养蛋鸭饲粮中以75%颗粒+25%粉状形式添加石粉为宜。

This experiment was conducted to study the effects of dietary particulate to ground limestone ratio on laying performance,egg quality,serum biochemical indices and tibia indices of cage-rearing laying ducks.A total of 200 Linwu ducks with similar body weight at 29 weeks of age were randomly allocated to 5 groups with 5 replicates in each group and 8 ducks in each replicate.Ducks in groups Ⅰ,Ⅱ,Ⅲ,Ⅳ and Ⅴ were fed experimental diets which contained 100% ground limestone,25% particulate limestone+75% ground limestone,50% particulate limestone+50% ground limestone,75% particulate limestone+25% ground limestone and 100% particulate limestone(calcium level was 3.52% in each group),respectively.The experiment lasted for 63 days.The results showed as follows:1)the qualified egg rate of groups Ⅲ and Ⅳ was significantly higher than that of group Ⅰ(P<0.05).2)The eggshell strength of groups Ⅲ and Ⅳ was significantly higher than that of groups Ⅰ and Ⅱ(P<0.05),and the eggshell strength of group Ⅴ was significantly higher than that of groupⅠ(P<0.05).3)The serum calcium content of group Ⅳ was significantly higher than that of groups Ⅰ and Ⅱ(P<0.05),and the serum alkaline phosphatase(AKP)activity of groups Ⅲ,Ⅳ and Ⅴ was significantly lower than that of groups Ⅰ and Ⅱ(P<0.05).4)Dietary particulate to ground limestone ratio had no significant effects on tibia indices of cage-rearing laying ducks(P>0.05).In conclusion,dietary particulate to ground limestone ratio can change the qualified egg rate and eggshell strength of laying ducks,thereby affecting the calcium content and AKP activity in serum.Synthesize these indicators,the suitable dietary limestone supplemental form of cage-rearing laying ducks in peak laying period is 75% particulate limestone+25% ground limestone under the condition of ensuring consistent dietary calcium level.