飼糧中鋅含量對豬隻排泄銅鋅之影響

Dietary zinc levels effect on copper and zinc excretion in pigs

施柏齡(Bor-Ling Shih) ； 李免蓮(Main-Nan Lee) ； 徐阿里(A-Li Hsu)

《畜產研究》 37卷1期 (2004/03) Pp. 53-62

摘要

本試驗目的以代謝試驗來探討生長豬及肥育豬飼糧中鋅含量對豬排泄物銅鋅含量之影響。於生長期及肥育期分別進行二個代謝試驗，每代謝試驗採用24頭閹公豬，分二批次進行，每批次12頭豬，逢機分配於4個處理組。生長期之試驗一及試驗二基礎飼糧含銅量分別為25及50ppm，添加氧化鋅，使鋅含量分別為60、120、180及250ppm；肥育期之試驗三及試驗四基礎飼糧含銅量分別為25及50ppm，鋅含量分別為50、100、150及250ppm。生長期及肥育期代謝試驗分別選取平均體重30及60公斤之閹公豬，均飼於代謝架。試驗期間收集糞尿量，測定尿糞銅鋅含量、銅鋅排泄量、蓄積量及消化率。結果顯示，生長豬飼糧含銅量為25ppm或50ppm時，在豬尿銅排泄量、糞銅排泄量、總排泄銅量及銅消化率在各組之間皆無顯著差異。但鋅採食量、糞及尿鋅排泄量、糞中含鋅量及鋅蓄積量皆隨飼糧中鋅含量之提高而提高（P＜0.05）。當飼糧銅含量為50ppm時，以含鋅量60ppm飼糧處理組之鋅消化率明顯較其他含高鋅量者為高（P＜0.05）。在肥育豬飼糧含銅量為25或50ppm時，則豬尿銅排泄量、糞銅排泄量、銅排泄量、銅消化率及鋅消化率在各組之間皆無顯著差異。而鋅採食量、糞及尿鋅排泄量、糞含鋅量及鋅蓄積量皆隨飼糧中鋅含量之提高而提高（P＜0.05）。綜合生長期及肥育期之糞中含鋅量對飼糧含鋅量均有顯著性一次及二次線性迴歸，欲降低豬糞堆肥的含鋅量，則豬配合飼料含鋅量宜限量。依豬糞最高含鋅限量800ppm時，依線性迴歸方程式分析，建議生長豬飼糧含鋅量不宜超過125ppm，而肥育豬飼糧含鋅量不宜超過95ppm。

關鍵字

豬 ； 鋅 ； 銅 ； 排泄

並列摘要

The purpose of these trials were to determine dietary zinc level effect on copper and zinc retention and excretion in pigs. This experiment included four trials, each included 24 crossbred barrows with 12 pigs in each replicate. The basal diets for growers contained 25 ppm Cu in Trial 1 and 50 ppm Cu in Trial 2. The grower basal diets were supplemented with ZnO, 60, 120, 180 and 250 ppm Zn, respectively. The finisher basal diet contained 25 ppm Cu in Trial 3 and 50 ppm Cu in Trial 4. The finisher diets contained 50、100、150 and 250 ppm Zn, respectively. The pigs were adapted to metabolic cages during the pretest period. Feces and urine samples were taken for 5 days with excretion, retention and Cu and Zn digestibility measured. The results indicated that dietary Cu levels did not affect the urinary and fecal Cu concentrations, Cu excretion, and apparent digestibility in growing pigs. The increase in dietary Zn levels significantly (P ＜ 0.05) increased the urinary and fecal Zn content, Zn fecal concentration and Zn retention, but did not affect Zn digestibility during the growing period. The dietary Cu levels for finishing pigs showed no effect on urinary and fecal Cu, Cu and Zn excretion. The increase in dietary Zn elevated the urinary and fecal Zn concentration, excretion and retention of Zn (P ＜ 0.05). It was concluded that increased Zn in the diet significantly increased (P ＜ 0.05) Zn excretion, shown in the linear and quadratic regression responses. The maximal level for Zn in manure for the China National standard is 800 ppm, it is suggested that Zn in growing and finishing diets be under 125 and 95 ppm, respectively.

並列關鍵字

Pig ； Zinc ； Copper ； Excretion