臺灣荷蘭乾乳牛飼予不同濃度陰離子飼料對其適口性、尿液pH值及血漿游離鈣濃度之影響

本試驗之目的在探討乳牛飼予不同濃度之商業陰離子精料（anionic feed, AF），對其使用後第1到6天、14天、21天之飼料適口性、體液酸鹼變化和血漿游離鈣濃度之影響。試驗採用未懷孕之乾乳牛20頭，以完全逢機分配於由商業乾乳精料和商業陰離子精料A、B及C等四處理組，其DCAD值分別為+3.5（DCF）、-25（LAFa）、-50（LAFb）及-75（LAFc）meq/100g DM，而其精、粗料採分別給飼。試驗結果顯示，第六天LAFa與LAFb二組之採食適口性與DCF組無顯著差異，LAFc組呈現最差採食適口性，六天之後各處理組間均未見拒食現象。尿液pH值隨著DCAD值下降，呈現直線關係，其關係如下:Y=7.9792+0.0351X（R^2=0.80,P＜0.001；X=DCAD值,Y=尿液pH值）。第21天LAFb與LAFc二組之全血pH、Pco_2、[HCO_3^-]及鹼超值（base excess, BE）顯著低於DCF組者，血漿游離鈣濃度（4.94±0.10 mg/dL）則顯著高於DCF組者（4.24±0.12 mg/dL），而尿液pH值則降低至5.5－6.8。整體來說，乾乳牛提供AF皆可使體內呈代謝性過酸症，並均有提升血漿中游離鈣濃度之效果。

關鍵字

陰離子精料；適口性；酸鹼反應；游離鈣濃度

並列摘要

This present study was conducted to evaluate the effects of different commercial anionic feed at different DCAD value on diet palatablility, Ca^(2+) concentrations, acidification and plasma ionized Ca concentrations of assigned into four dietary treatments with DCAD of + 3.5 (DCF), -25 (LAFa) and -50 (LAFb) and -75 meq/100 g of DM . LAFa and LAFb groups were no significant difference (P = 0.48) in diet to palatablility among the DCF. The LAFc group was badly palatabilities expressed as the time spent on concentrate intake, but after six days each treatments has not refusal the intake duration time. In our study was evidenced by decreased blood Pco_2, bicarbonate concentrations and base-excess when the LAFb and LAFc salts were fed. which acidify effectively was significantly lower (P ＜ 0.05) than that in DCF, the plasma ionized calcium concentrations in LDa (4.94 mg/ dL) and LDb (4.78 mg/dl) were significantly greater than that in DCF (4.24 mg/dL mg/dl), urine pH was lower in cows fed LDa or LDb than those fed of DCF (P ＜ .0001) on d 21. The results indicated that anionic feed can induce metabolic acidosis of body fluid and increase plasma ionized calcium concentrations.

並列關鍵字

Anionic salts ； Diet palatability ； Acid-base status ； Plasma ionized calcium

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