日粮磷水平对老龄笼养蛋鸡内分泌及骨密度的影响

Effects of Phosphorus Level on Internal Secretion and Bone Density in Old Layers

选用58周龄新扬州鸡产蛋母鸡300只,随机设计分为3组(对照组,0.25%组,0.15%组),每组5个重复,分别饲喂有效磷水平为0.35%,0.25%,0.15%的玉米-豆粕型日粮,研究日粮磷水平对老龄蛋鸡甲状旁腺素(PTH)、降钙素(CT)、雌二醇(E2)、骨钙素(BGP)及骨密度(BMD)的影响。结果表明,各组间PTH、CT差异不显著;0.15%组E2、BMD显著低于对照组(p<0.01);0.15%组BGP比对照组显著增高(p<0.01)。随日粮磷水平降低老龄蛋鸡骨质疏松发病风险性增加。日粮有效磷水平为0.35%有助于延缓老龄蛋鸡骨质流失,日粮有效磷含量低于0.15%时,则会显著升高BGP、降低E2水平,且骨质流失严重。

An experiment was conducted by using 300 New Yangzhou Layers aged 58 weeks to study the effect of phosphorus level on parathyroid element （PTH）, fall calcium element （CT）, estradiol （E2）, bone calcium element （BGP） and bone density （BMD） of old layers. Layers were randomly divided into three treatments （control group, 0.25% treatment and 0.15% treatment）, each treatment represented by five replicates. Layers were fed cornsoybean based diet with different levels of the effective phosphorus： 0.35%, 0.25% and 0.15%. The results showed that the difference of PTH and CT in each group was not remarkable; E2 and BMD of 0.15 % treatment was obviously lower than that of the control group （p 〈 0.01） ; while BGP of 0.15% treatment was remarkable higher than that of the control group （p 〈 0.01 ）. Conclusion： Osteoporosis morbidity of old layers increases along with reducing phosphorus level. The effective phosphorus level is 0.35 % is helpful to the postponement old layers sclerotin outflow, while the effective phos- phorus content is lower than 0.15 %, then it can obviously elevate BGP, reduce the E2 level, and the sclerotin outflow becoming severity.