飼糧中以不同比例或型態甘藷取代玉米對雜交肉豬生長性能及屠體性狀之影響

本研究使用平均體重約34 kg之LD雜交肉豬32頭，依體重逢機分為4組，每組8頭，分別以4種飼糧餵飼，第1組為對照組，係以玉米及大豆粕為主之飼料原料所調配之飼糧，第2至3組分別以臺農66號甘藷粉取代對照組玉米用量之25%、50%，另於第3組飼糧中添加0.1%之離胺酸作為第4組飼糧。飼糧採任食，飲水充分供應，餵飼至體重約達65 kg時，結束生長期試驗。結果顯示，在體重34 kg至65kg之生長期肉豬，各組豬隻之平均飼料攝食量、平均日增重及飼料轉換率等，皆隨著甘藷粉取代玉米量增高而顯著降低，因此推薦對於體重介於34 kg至65 kg之生長期肉豬，以甘藷粉取代飼料中之玉米建議用量為25%。而由豬體重66 kg起進行肥育期試驗，以25%之甘藷簽或甘藷簽磨成粉狀取代飼糧玉米餵飼，測定豬之每日增重及飼料轉換率等生長性狀，於體重約124 kg時結束肥育期生長試驗，每組選取體重相近之豬隻6頭，經屠宰後測定屠體性狀、屠肉成分、豬肉色澤、豬肉風味品評及接受度等。結果顯示，由豬體重66 kg開始進行之肥育期試驗，以25%之甘藷簽或甘藷簽磨成粉狀餵飼，對其每日飼料攝食量、平均每日增重以及飼料轉換率皆無明顯的影響，而各組豬隻之豬肉屠肉化學成分、屠體性狀、肌肉性狀及肌肉色澤皆無差異，另以25%甘藷粉取代玉米者，其背最長肌之咬感評分比以甘藷簽餵飼或對照組為高，而背最長肌之品評總接受度，則反而顯著地低於其餘2組（P＜0.05），綜上言之，對體重66kg至124kg之肥育期肉豬，以25%甘藷簽取代飼糧中之玉米，相較於將它磨粉使用，對生長、屠體及肌肉性狀等，皆無顯著的差異。

關鍵字

甘藷；型態；雜交肉豬；生長性能；屠體性狀

並列摘要

A total of 32 LD (Landrace × Duroc-Jersey) crossbred pigs, average body weight 34 kg, were used as experimental animals. Pigs were allocated into 4 treatments by body weight (BW) and fed with four diets, i.e. Control (C), graded levels substitution of corn in control diet by sweet potato meal, 25%, 50% and 100% added 0.1% lysine (SP 25, SP50, SP100 + Lys). Feed and water were provided on an ad libitum basis. When BW of the pigs reached approximately 65 kg, the grower pigs experiment was finished and growth performance were measured. From BW 66 kg, pigs were reallocated into three treatments and provided with control diet (C), 25% sweet potato chip substituted diet and 25% sweet potato meal substituted diet. Experiment was finished when the BW of pigs reached 124 kg. Six pigs from each treatment were slaughtered and the carcass characteristics were measured. Growth performance, carcass characteristics, chemical composition and panel test of loin meat were evaluated. The results showed that the average feed intake and daily gain of grower pigs decreased with the increase of the substitution levels of sweet potato for corn in diets. For finisher pigs, there were no difference on average feed intake, daily gain and feed conversion rate among treatments. No difference were also observed on chemical composition of meat, carcass characteristics and meat color. The chewiness score of loin meat from pigs fed 25% sweet potato meal was higher than either the control group or 25% sweet potato chip group. Nevertheless, the overall acceptability of the meat from those pigs was lower than the other two groups.

並列關鍵字

Sweet potato ； Forms ； Crossbred pig ； Growth performance ； Carcass characteristics

國際替代計量

飼糧中以不同比例或型態甘藷取代玉米對雜交肉豬生長性能及屠體性狀之影響

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