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    蒸汽壓片玉米

    蒸汽壓片玉米:
    玉米是單胃及反芻動物日糧中的主要能量來源,玉米的主要營養成份是淀粉(含量高達64%-78%),因此,提高玉米淀粉利用率是提高增重效率和奶產量的根本。蒸汽壓片處理玉米(Steam-flaked Corn)可以大大地提高玉米的消化率。蒸汽壓片處理玉米是通過蒸汽熱加工使玉米膨脹、軟化,然后用一對反向旋轉滾筒產生的機械壓力剝離壓裂這些已膨脹的玉米,將玉米加工成規定密度的薄片。其機理實際上是一個凝膠化的過程,即將緊密結合型的玉米淀粉,通過凝膠化來破壞細胞內淀粉結合的氫健,從而提高動物對玉米淀粉的消化率。此外,在處理過程中,玉米中蛋白質的化學結構得到改變,有利于瘤胃對蛋白質的吸收。
    藍雷新工藝:
    蒸汽壓片品質好壞取決于整個加工過程中熱與力的綜合效果,也就是說,工藝參數的不同對其營養價值具有很大的影響。
    藍雷新標準:

    容重(g/L) 淀粉糊化度 泌乳凈能 淀粉消化率 粗蛋白 水分
    340-390 75 2.18Mcal/kg 99.5 9.4 <14

    蒸汽壓片玉米與粉粹玉米對比:

    對比項目 蒸汽壓片玉米 粉碎玉米
    總可消化養分(%) 91.7 88.7
    泌乳凈能(Mcal/kg) 2.18 2.01
    增重凈能(Mcal/kg) 1.585 1.48
    維持凈能(Mcal/kg) 2.24 2.16
    酸洗纖維 9.5 9.5
    中洗纖維 3.4 3.4
    粗蛋白 9.4 9.4

    蒸汽壓片玉米對反芻動物的作用:
    1、蒸汽壓片玉米降低干物質采食量16.9%,但不影響日增重,可以降低料肉比17.8%左右,但不影響胭體品質。
    2、其主要是通過改變玉米的物理化學狀態,從而提高瘤胃、小腸以及全消化道中的淀粉消化率,增加能值和機體內尿索再循環的次數,優化氮素在機體內的分配,提高牛的生產性能。
    3、日增重較粉碎玉米提高20%。

    1、蒸汽壓片玉米較粉碎壓玉米使奶牛產乳量、乳蛋白率和乳蛋白量分別提高6.7%, 2.7%, 17.9%,但并沒有影響乳脂量和干物質采食量。
    2、蒸汽壓片玉米提高瘤胃淀粉消化率26%、過瘤胃淀粉消化率41%、總消化道淀粉消化率19%。
    3、蒸汽壓片可以提高產乳量可能的原因包括:
    ①微生物蛋白合成的提高;②丙酸的增加;
    ③淀粉的過瘤胃消化率提高;④過瘤胃蛋白的提高。
    1、犢牛開食料必須有大量易消化淀粉,淀粉在發酵時會產生大量的丁酸,丁酸對瘤胃發育的影響遠大于其他物質。
    2、蒸汽壓片玉米的淀粉利用率是最高的。
    3、蒸汽壓片玉米可以促進VFA吸收,預防犢牛瘤胃酸中毒。
    蒸汽壓片玉米對豬的使用效果:
    1、可以提高10%的采食量
    2、可以有效降低腹瀉情況
    3、可以降低料肉比
    4、有效縮短出欄時間
    5、增加喃乳母豬泌乳量,保證仔豬成活率
    6、促進消化器官發育完善,提高營養利用率
    蒸汽壓片玉米其他價值:
    1、蒸汽壓片玉米對氮消化代謝的影響,發現相對于干碾玉米。蒸汽壓片玉米可以提高微生物蛋白量28%左右,提高微生物效率10%,小腸和總腸道氮消化率分別提高10%, 8%。
    2、蒸汽壓片玉米和粉碎玉米對奶牛磷的代謝時發現:蒸汽壓片玉米可以降低磷的排泄量,而對乳磷含量沒有影響,對磷平衡也沒有影響。

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