Evaluation of the Effect of Substitution of Corn by Brown Rice in Diets on the Growth Performance and Carcass Quality of Growing-Finishing Pigs

本研究使用平均體重約30公斤之LD雜交肉豬，依體重逢機分為五個處理組，每組十頭，試驗飼糧第一組為對照組，第二至四組分別以糙米取代對照組玉米用量之50%、75%及100%，並於第四組飼糧中添加0.2%之胺基酸鐵作為第5組飼糧，飼糧採任食，飲水充分供應，豬隻平均體重約達65公斤時，更換肥育期飼糧餵飼至體重約達120公斤時，結束試驗，測定豬生長性能。同時每組選取體重相近之豬隻六頭，經屠宰後測定屠體品質、屠肉成分、色澤及進行豬肉品評。結果顯示，以糙米取代飼料中之玉米用量50%之飼糧，於生長期飼料轉換率較高、背脂厚度較薄、而肌間脂肪含量百分比高，且其背最長肌品評之總接受度，和攝食100%玉米之對照組豬隻，無顯著差異，然顯著地高於其他各組。而背最長肌中脂肪酸組成，於各組間，未有顯著之差異，飼糧添加糙米取代玉米餵飼生長肥育豬，其取代量係以重量取代50%玉米為宜。 A total of 50 LD (Landrace×Duroc-Jersey) crossbred pigs, average body weight 30 kg, were used as experimental animals. Pigs were allocated into 5 treatments by body weight (BW) and fed with five diets, i.e. Control, graded levels substitution of corn in the control diet by brown rice (SC 50%, SC 75%, SC 100% and SC 100% added Fe-amino acid). Feed and water were provided on an ad libitum basis. Pigs were fed the finisher diet when the average body weight of the pigs reached 65 kg. When BW reached 120 kg, all pigs were weighed and 6 pigs from each treatment were delivered to the slaughterhouse and the carcass characteristics were measured. The growth performance, carcass quality, meat composition, panel test of loin meat and fatty acid composition of the meat were evaluated. The results showed the pigs fed a diet of SC 50% had more efficient utilization of feed during the growing period. The pigs of SC 50% had less backfat thickness and higher marbling in the loin meat. The overall acceptability of loin from pigs fed the SC 50% did not differ from the control group, but was higher than the other groups. No difference was observed on the fatty acid composition of loin meat among the groups. Substitution of corn by brown rice in the diet of growing - finishing pigs to 50% is recommended