日粮苏氨酸水平对0～8周龄鹅生长性能及屠宰性能的影响

Effects of Dietary Threonine Level on Growth Performance and Carcass Traits of 0-8 Week Old Yangzhou Goslings

[目的]确定0～8周龄扬州鹅适宜的日粮苏氨酸水平。[方法]在单因素试验中，选用体重相近的1日龄扬州鹅雏鹅300只，公母各半。随机分成5个处理组，苏氨酸设5个梯度水平，分别为0．54％（基础日粮组）、0．64％、0．74％、0．84％和0．94％，研究了日粮苏氨酸水平对0～8周龄鹅生长性能和屠宰性能的影响。[结果]日粮苏氨酸水平极显著影响了0～4周龄仔鹅的体重（P〈0．01），显著影响了0～4周龄仔鹕的饲料转化比（P〈0．05），但对5-8周龄鹅体重和饲料转化比的影响不显著。苏氨酸水平对8周龄鹅屠宰性能的影响不显著，8周龄鹅的全净膛率、胸肌率和腹脂率在苏氨酸水平为0．74％时达到最大值，腿肌率则在0．84％时达到最高。[结论]综合0～8周龄鹅的生长性能和屠宰性能各指标，建议日粮苏氨酸水平为0．74％～0．84％.

[Objective] The study aimed to confirm the dietary threonine level suitable for 0 ？8 week old Yangzhou goslings.[Alethod] In the single factor test,300 one-day-old Yangzhou goslings were randomly allocated to 5 dietary treatment groups with 50% male goslings and 50% female goslings .The 5 grade levels of threonine were set up as 0.54% （basic dietary） ,0.64% ,0.74% ,0.84% and 0.94% resp.to study the effects of dietary threonine level on growth performance and carcass traits of 0 ？8 week old Yangzhou goslings.[Result] The dietary threoninc levels significantly influenced the bodyweight （ P 〈 0.01）and the feed conservation rate（ P 〈 0.05）of 0 -4 week old goslings , but did not significantly affect the one of 5-8 week old goslings .The dietary threonine levels did not significantly influenced the carcass trait of 8 week old goslings. The whole net carcass rate, breast muscle percentage and breast muscle percentage reached the maximum when the threonine was 0.74% , while the leg muscle lute reached lie maximum when the threonine was 0.84% .[Conclusion] Comprehensively considering with each index of growth performance and carcass traits of 0 ？8 week old Yangzhou goslings, it was suggested that the optimum dietary threonine levels was 0.74% -0.84% .