不同鋅源及添加水平對斷奶仔豬微量元素代謝與鋅相關(guān)基因表達的影響
發(fā)布時間:2018-08-13 16:32
【摘要】:本文旨在研究不同水平的蛋氨酸鋅(Zn-Met)與一水硫酸鋅(ZnSO4·H2O)組合使用對斷奶仔豬生產(chǎn)性能、血液指標、免疫指標、微量元素代謝及鋅相關(guān)基因表達量的影響,以確定有機鋅與無機鋅的最佳配合模型,為養(yǎng)殖生產(chǎn)中低水平添加鋅滿足斷奶仔豬的生長需要,減少糞便鋅的排放提供理論依據(jù)。選擇30日齡、平均體重(10.69±0.26)kg、健康狀態(tài)良好的三元公豬35頭,隨機分為5個處理,每個處理7個重復(fù),每個重復(fù)1頭豬。采用基礎(chǔ)飼糧相同(預(yù)混料不添加鋅)。處理Ⅰ為對照組(基礎(chǔ)飼糧+硫酸鋅100 mg/kg),處理Ⅱ-Ⅴ為試驗組,分別用蛋氨酸鋅以1:2的比例替代對照組中的硫酸鋅25 mg/kg、50 mg/kg、75 mg/kg與100 mg/kg(添加水平均以鋅元素計)。試驗期共49 d,預(yù)試期7 d,正試期42 d。試驗結(jié)果表明:(1)與對照組相比,試驗組平均日增重、平均日采食、料重比差異均不顯著(P0.05)。(2)與對照組相比,試驗組的鋅表觀消化率顯著提高(P0.05),有機物消化率無顯著差異(P0.05)。(3)與單一的蛋氨酸鋅或者硫酸鋅相比,混合鋅能提高仔豬血清白細胞(WBC)含量與淋巴細胞(LYM)含量,且其中添加50 mg/kg硫酸鋅組合25 mg/kg蛋氨酸鋅的試驗組相比其他組有著顯著提高(P0.05)。(4)與對照組相比,添加混合鋅的試驗組血清鋅含量、血清錳含量、肝臟鋅水平與胰臟鋅水平均顯著升高(P0.05),糞便鋅的排泄量顯著降低(P0.05),說明混合鋅能改善仔豬血清、組織中的微量元素狀況,顯著降低糞便鋅的排泄量。(5)對照組的胸腺、脾臟與胰臟的器官指數(shù)最低,與對照組相比,試驗組的胸腺、脾臟、胰臟指數(shù)均顯著升高(P0.05),血清MDA顯著降低(P0.05),說明混合鋅能提高仔豬抗應(yīng)激能力。(6)與對照組相比,添加混合鋅的試驗組的各組織金屬硫蛋白(MT)mRNA與脾臟、腎臟的C-反應(yīng)蛋白(CRP)mRNA相對表達量顯著升高(P0.05);脾臟與腎臟的結(jié)合珠蛋白(HP)mRNA與α1-酸性糖蛋白(AGP)mRNA、各組織血清淀粉樣蛋白A(SAA)mRNA表達量均顯著高于對照組,且均隨蛋氨酸鋅添加量升高而升高(P0.05),說明蛋氨酸鋅與硫酸鋅混合使用能提高各組織MT與CRP的合成與分泌,蛋氨酸鋅更能誘導(dǎo)急性期蛋白(APP)基因表達,提高免疫力。綜上所述,蛋氨酸鋅與硫酸鋅混合使用可以顯著改善斷奶仔豬機體鋅營養(yǎng)水平。與單一使用硫酸鋅相比,蛋氨酸鋅與硫酸鋅混合使用不僅能在減少飼料添加鋅水平,還能提高機體抗病力,改善仔豬血清、組織中的微量元素狀況,顯著降低糞便鋅的排泄量,其中以50 mg/kg的硫酸鋅組合25 mg/kg的蛋氨酸鋅的微量元素減排效果最佳;蛋氨酸鋅與硫酸鋅混合使用可以增強MT分泌,蛋氨酸鋅比雙倍水平硫酸鋅更能誘導(dǎo)APP mRNA表達量,增強斷奶仔豬非特異性免疫機制。
[Abstract]:The purpose of this study was to study the effects of different levels of zinc methionine (Zn-Met) combined with zinc sulfate monohydrate (ZnSO4 H2O) on production performance, blood index, immune index, trace element metabolism and zinc related gene expression in weaned piglets. In order to determine the optimal combination model of organic zinc and inorganic zinc, the theoretical basis was provided for the low level zinc supplementation to meet the growth needs of weaning piglets and to reduce the discharge of zinc from feces. Thirty three boars with average body weight of (10.69 鹵0.26) kg and healthy condition were randomly divided into 5 treatments with 7 replicates per treatment and 1 pig per replica. The basic diet is the same (no zinc is added to the premixed feed). Treatment 鈪,
本文編號:2181554
[Abstract]:The purpose of this study was to study the effects of different levels of zinc methionine (Zn-Met) combined with zinc sulfate monohydrate (ZnSO4 H2O) on production performance, blood index, immune index, trace element metabolism and zinc related gene expression in weaned piglets. In order to determine the optimal combination model of organic zinc and inorganic zinc, the theoretical basis was provided for the low level zinc supplementation to meet the growth needs of weaning piglets and to reduce the discharge of zinc from feces. Thirty three boars with average body weight of (10.69 鹵0.26) kg and healthy condition were randomly divided into 5 treatments with 7 replicates per treatment and 1 pig per replica. The basic diet is the same (no zinc is added to the premixed feed). Treatment 鈪,
本文編號:2181554
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