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本論文進行三個試驗研究料槽下料口寬度和料型對保育豬（試驗一、二）和育肥豬（試驗三）生長性能的影響。試驗為2×3雙因素設計，下料口空隙寬度（窄料口和寬料口最窄時寬度為1.27和2.54厘米），3種料型為粉料、含粉顆粒料（試驗一、二含粉率為30%，試驗三含粉率為50%）、過篩顆粒料（含粉率3-10%）。試驗一選用210頭保育豬（平均初始重11.9kg），每個處理5圈，每圈7頭，試驗期21天。試驗未觀察到料槽和料型之間的互作關系。料槽口寬度對日增重、采食量和料比沒有顯著影響。飼喂粉料的豬比其它兩種料型采食量和日增重更高（P＜0.05）。飼喂過篩顆粒料的豬只飼料轉化率比其它兩種料型料肉比更低（P＜0.05）。試驗二選用1005頭保育豬（初始均重14.1kg），每個處理6圈，每圈26-28頭仔豬，試驗期28天。結果表明與寬料口組相比，窄料口組豬只采食量和日增重更低（P＜0.05），飼料轉化率差異不顯著。粉料組豬只日增重較其他兩組更低（P＜0.05）。與過篩顆粒料相比，飼喂粉料和含粉顆粒料的豬只料肉比更高。試驗三選用了246頭育肥豬（初始重56.8kg），每個處理5圈，每圈6-7頭，試驗期69天。窄料口組豬只采食量更低，但料肉比更好（P＜0.05），對日增重沒有影響。與過篩顆粒料相比，粉料組豬只日增重有降低的趨勢（P＜0.10），料肉比更高（P＜0.05）。含粉顆粒料豬只日增重和料肉比處于中間水平。飼喂粉料和含粉顆粒料豬只采食量比過篩顆粒料更高（P＜0.05）。總的來說，保育豬料槽下料口更寬可能增加采食量和日增重并不影響料比。對育肥豬來說，窄料槽能減少耗料量，改善料比。在所有試驗中，低含粉率的顆粒料能最大化改善飼料轉化率。

Three experiments were conducted to determine the effects of feeder adjustment and diet form on growth performance of nursery (Exp. 1 and 2) and finishing (Exp. 3) pigs. Treatments were arranged as a 2 × 3 factorial with the main effects of feeder adjustment and diet form. The 2 feeder adjustments were a narrow and wide feeder adjustment (minimum gap opening of 1.27 and 2.54 cm, respectively). The 3 diet forms were meal, poor-quality pellets (70% pellets and 30% fines for Exp. 1 and 2 and 50% pellets and 50% fines for Exp. 3), and screened pellets with minimal fines (3 to 10%). In Exp. 1, 210 pigs (initially 11.9 kg BW) were used in a 21-d trial with 7 pigs per pen and 5 pens per treatment. No feeder adjustment× diet form interactions were observed. There were no differences in ADG, ADFI, or G:F due to feeder adjustment. Pigs fed the meal diet had increased ( P< 0.05) ADG and ADFI compared with pigs fed the poor-quality or screened pellets. Pigs fed meal or poor-quality pellets had decreased (P < 0.05) G:F compared with pigs fed screened pellets. In Exp. 2, 1,005 nursery pigs (initially 14.1kg BW) were used in a 28-d trial with 26 to 28 pigs per pen and 6 pens pertreatment. Pigs fed from the narrow feeder adjustment had decreased ( P<0.05) ADG and ADFI compared with pigs fed from the wide adjustment with no differences in G:F. Pigs fed the meal diet had decreased (P < 0.05) ADG compared with pigs fed poor-quality or screened pellets. Pigs fed meal or poor-quality pellets had decreased (P < 0.05) G:F compared with pigs fed screened pellets. In Exp. 3, 246 pigs (initially 56.8 kg BW) were used in a 69-d trial with 5 pens per treatment and 6 or 7 pigs per pen. Overall, ADFIdecreased (P < 0.05) and G:F increased (P < 0.05) for pigs fed from the narrow adjusted feeders compared with the wide adjustment with no differences in ADG. Overall, pigs fed meal diets tended to have decreased ( P < 0.10) ADG and had decreased (P < 0.05) G:F compared with pigs fed screened pellets;ADG and G:F in those fed poor-quality pellets were intermediate. Feeding meal or poor-quality pellets increased (P < 0.05) ADFI compared with pigs fed screened pellets. In conclusion, feeding nursery pigs from a wide feeder gap may increase ADG and ADFI with no negative effects on G:F. For finishing pigs,reducing feeder gap reduced feed disappearance and improved G:F. In all experiments, the greatest G:F improvements from pelleting were observed when the percentage of fines was minimized.

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