B. J. Kerr, S. L. Trabue and D. S. Andersen
　　本論文開展3個試驗（保育豬、生長豬、育肥豬），研究玉米豆粕型日糧或玉米豆粕DDGS型中添加日糧30 ppm鹽霉素對日糧養分消化率的影響。

　　試驗一，選用64頭小母豬（初始重9.0±1.0 kg），試驗二選用64頭小母豬（初始重81.1±6.1 kg），隨機分入單欄飼養，飼養期分別為24天、21天。每個試驗的最后2天，收集糞便樣品，測算總能和其它養分的全腸道表觀消化率。

　　試驗三，選用2批24頭小母豬（初始重145.1±7.8 kg），隨機分入單體代謝籠中，飼喂試驗日糧30天，隨后6天收集全部糞便，計算總能和養分消化率。

　　試驗一結果表明，日糧類型和鹽霉素之間在肉料比和許多養分消化率方面存在互作。當日糧為玉米豆粕型日糧時，鹽霉素沒有提高總能、干物質、碳、硫、磷、中性洗滌纖維和酸性洗滌纖維的消化率，甚至部分指標降低；而當日糧為玉米豆粕DDGS時，這些指標均有顯著提高（互作，P≤0.05）。盡管鹽霉素沒有影響日增重和采食量，并改善了玉米豆粕型日糧組肉料比，但是卻降低了玉米豆粕DDGS日糧組的肉料比（互作，P≤0.05）。

　　試驗二結果表明，日糧類型和鹽霉素僅在鈣全腸道表觀消化率方面有互作（P＜0.01），鹽霉素對玉米豆粕型日糧鈣消化率無影響，而降低玉米豆粕DDGS型日糧鈣的消化率。

　　試驗三結果表明，日糧類型和鹽霉素僅在碳全腸道表觀消化率方面有互作（P＜0.01）。鹽霉素提高了玉米豆粕型日糧碳的表觀消化率，而降低了玉米豆粕DDGS日糧碳的全腸道表觀消化率。

　　總之，試驗數據表明鹽霉素效果與動物階段有關，在9-23kg階段具有最好的提高生長性能和養分消化率的效果。試驗結果同時表明日糧中添加DDGS會降低所有階段豬只的總能、干物質、鈣和氮的消化率。

　　Narasin effects on energy, nutrient, and fiber digestibility in corn-soybean meal or corn-soybean meal-dried distillers grains with solubles diets fed to 16-, 92-, and 141-kg pigs

　　B. J. Kerr, S. L. Trabue and D. S. Andersen

　　Three experiments were conducted to determine the effect of narasin on growth performance and on GE and nutrient digestibility in nursery, grower, and finishing pigs fed either a corn-soybean meal (CSBM) diet or a CSBM diet supplemented with distillers dried grains with solubles (DDGS), in combination with either 0 or 30 mg narasin/kg of diet. In Exp. 1 (64 gilts, initial BW = 9.0 kg, SD = 1.0 kg) and Exp. 2 (60 gilts. initial BW = 81.1 kg, SD = 6.1 kg), gilts were allotted into individual pens and fed their experimental diets for 24 and 21 d, respectively. On the last 2 d of each experiment, fecal samples were collected to assess apparent total tract digestibility (ATTD) of GE and various nutrients. In Exp. 3, 2 separate groups of 24 gilts (initial BW = 145.1 kg, SD = 7.8 kg) were allotted to individual metabolism crates and fed their experimental diets for 30 d prior to a time-based 6-d total fecal collection period to assess GE and nutrient digestibility. In Exp. 1, there was an interaction between diet type and narasin addition for G:F and for many of the ATTD coefficients measured. When narasin was supplemented to the CSBM diet, ATTD of GE, DM, C, S, phosphorus, NDF, and ADF was either not changed or reduced, while when narasin was supplemented to DDGS diets, these same ATTD parameters were increased (interaction, P ≤ 0.05). Even though ADG and ADFI were not affected, G:F] was improved in pigs fed the CSBM diet with supplemental narasin, but was reduced in pigs fed the DDGS diet with supplemental narasin (interaction, P < 0.05). In Exp. 2, there was an interaction between diet type and narasin supplementation only for ATTD of Ca (interaction, P < 0.01), in that narasin supplementation did not change the ATTD of Ca in pigs fed the CSBM diet, while narasin supplementation reduced the ATTD of Ca in pigs fed the DDGS containing diet. In Exp. 3, there was an interaction between diet and narasin only for ATTD of C (interaction, P <0.01) in that narasin supplementation resulted in an increased ATTD of C inpigs fed the CSBM diet, while narasin supplementation to the DDGS containing diet resulted in a reduced ATTD of Ca. In general, the data indicate that narasin interacted with and had its largest effect on pig performance and GE ornutrient digestibility in 9 to 23 kg pigs compared to pigs weighing greater than 80 kg. The data also indicate that the addition of DDGS reduced GE, DM, Ca, and N digestibility, regardless of BW。

　　翻譯：朱滔 轉自： 豬營養國際論壇CSIS