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                                                                                                                                              首頁 > 新聞中心 > 飼料中蛋白質含量會影響蛋白質的消化吸收率嗎?
                                                                                                                                              飼料中蛋白質含量會影響蛋白質的消化吸收率嗎?
                                                                                                                                              點擊次數:465 發布時間:2021-09-24
                                                                                                                                                消化率是指飼料中某種營養物質(水除外)可以被消化的部分占食人總量的百分數。以粗蛋白質為例,其飼料消化率的計算公式如下:
                                                                                                                                               
                                                                                                                                                某一飼料中粗蛋白質的消化率(%)
                                                                                                                                               
                                                                                                                                                飼料中粗蛋白質含量一糞中粗蛋宣墮魚量×100%
                                                                                                                                               
                                                                                                                                                飼料中粗蛋白質含量
                                                                                                                                               
                                                                                                                                                其他營養成分消化率的計算過程依上式類推。各種飼料的消化率一般是通過消化試驗確定的。
                                                                                                                                               
                                                                                                                                                利用率是指飼料中某種營養物質(水除外)被動物用來合成體組織,形成肉、蛋、奶等產品,或分解供能的部分占食人總量的百分數。各種飼料的利用率一般是通過飼養試驗確定的,測定過程比較復雜。
                                                                                                                                               
                                                                                                                                                飼料中蛋白質含量的影響:飼料中蛋白質含量是否會影響蛋白質的消化吸收率。由于在研究中隨著蛋白質含量的變化,其他飼料成分也相應改變,因而消化吸收率的變化,是由于飼料成分的影響,還是由于蛋白質含量的影響,這給判斷帶來一定的困難。赤筑(1956)用酪蛋白+淀粉+鹽類的混合飼料投喂稚鯉,觀察到蛋白質含量在10%時消化吸收率低,而蛋白質含量在20-40%時,消化吸收率沒有大的差別。他認為蛋白質含量低時消化吸收率也低的原因,可能是受到內因性N成分的影響;他在另一研究中發現,蛋白質含量低時,表觀消化吸收率也小,但如把內因性蛋白態N量以0.04毫克/克體重加以修正時,則與真消化吸收率大體一致,因而認為在低蛋白質含量所看到的表觀消化率的降低,不是由于添加淀粉所成績起的,而是由于內因性蛋白態N所致。
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