麥麩降低日糧消化能、代謝能和凈能含量，但是不同方法（差值法和線性回歸法）得到...

畜牧編輯

　　第五十六期：麥麩降低日糧消化能、代謝能和凈能含量，但是不同方法（差值法和線性回歸法）得到的麥麩能值無顯著差異

　　2016. J. Anim.Sci. 94(7):3012-3021

　　麥麩降低日糧消化能、代謝能和凈能含量，但是不同方法（差值法和線性回歸法）得到的麥麩能值無顯著差異
　　N. W.Jaworski, D. W. Liu, D. F. Li和H. H. Stein

　　本試驗檢測了生長豬玉米豆粕型日糧中添加15%或30%麥麩對消化能、代謝能和凈能的影響，并比較了不同方法（差值法和線性回歸法）得到的麥麩能值之間的差異。

　　試驗選用18頭去勢公豬（初始重54.4±4.3kg），分別置于代謝籠中。試驗共3種日糧，每種日糧6個重復。基礎日糧中含玉米、豆粕，無麥麩添加。其他兩種日糧中分別添加15%或30%麥麩（基礎日糧添加量分別為85%、70%）。試驗期15天，前7天為適應期，豬只每天飼喂573kcal代謝能/kg代謝體重（BW0.6）試驗日糧。第8天，將代謝籠置于開放式循環呼吸代謝室，檢測氧的消耗量、二氧化碳和甲烷的生成量。飼喂量同適應期一致，并收集豬只糞便和尿液。試驗第13-14天，豬只每天飼喂225 kcal代謝能/kg代謝體重（BW0.6）試驗日糧，然后停止飼喂24小時，獲得饑餓產熱量。

　　試驗結果表明隨著麥麩添加量的提高，日糧干物質、總能、粗纖維、ADF和NDF的全腸道表觀消化率線性降低（P≤0.05）。麥麩添加量的提高線性降低了氧的消耗量、二氧化碳和甲烷的生成量（P≤0.05），導致產熱量線性降低（P≤0.05）。隨著麥麩添加量的提高（0、15%、30%）日糧消化能（分別為3454、3257、3161 kcal/kg）、代謝能（分別為3400、3209、3091 kcal/kg）、凈能（分別為1808、1575、1458 kcal/kg）線性降低（P≤0.05）。使用差值法計算得到的麥麩消化能、代謝能和凈能分別為2168、2117、896 kcal/kg），此能值均位于用線性回歸方法計算的麥麩能值（分別為2285、2217、961 kcal/kg）的95%的置信區間。

　　總之，玉米豆粕型日糧中麥麩含量的增加可以顯著降低能量和養分的消化率、產熱量、日糧能量（消化能、代謝能、凈能），但是不同方法（差值法和回歸法）得到的麥麩能值無顯著差異。

　　Wheat bran reduces concentrations of digestible, metabolizable, and net energy in diets fed to pigs, but energy values in wheat bran determined by the difference procedure are not different from values estimated from a linear regression procedure

　　N. W. Jaworski, D. W. Liu, D. F. Li and H. H. Stein

　　An experiment was conducted to determine effects on DE, ME, and NE for growing pigs of adding 15 or 30% wheat bran to a corn–soybean meal diet and to compare values for DE, ME, and NE calculated using the difference procedure with values obtained using linear regression. Eighteen barrows (54.4 ± 4.3 kg initial BW) were individually housed in metabolism crates. The experiment had 3 diets and 6 replicate pigs per diet.The control diet contained corn, soybean meal, and no wheat bran. Two additional diets were formulated by mixing 15 or 30% wheat bran with 85 or 70%of the control diet, respectively. The experimental period lasted 15 d. During the initial 7 d, pigs were adapted to their experimental diets and housed in metabolism crates and fed 573 kcal ME/kg BW0.6 per day. On d 8, metabolism crates with the pigs were moved into open-circuit respiration chambers for measurement of O2 consumption and CO2 and CH4 production. The feeding level was the same as in the adaptation period, and feces and urine were collected during this period. On d 13 and 14, pigs were fed 225 kcal ME/kg BW0.6 per day, and pigs were then fasted for 24 h to obtain fasting heat production. Results of the experiment indicated that the apparent total tract digestibility of DM, GE, crude fiber, ADF, and NDF linearly decreased (P ≤ 0.05) as wheat bran inclusion increased in the diets. The daily O2 consumption and CO2 and CH4 production by pigs fed increasing concentrations of wheat bran linearly decreased (P ≤ 0.05), resulting in a linear decrease (P ≤ 0.05) in heat production. The DE (3,454, 3,257, and 3,161 kcal/kg for diets containing 0, 15, and 30% wheat bran, respectively for diets containing 0, 15, and 30% wheat bran, respectively), ME(3,400, 3,209, and 3,091 kcal/kg for diets containing 0, 15, and 30% wheat bran, respectively), and NE (1,808, 1,575, and 1,458 kcal/kg for diets containing 0, 15, and 30% wheat bran, respectively) of diets decreased (linear,P ≤0.05) as wheat bran inclusion increased. The DE, ME, and NE of wheat bran determined using the difference procedure were 2,168, 2,117, and 896 kcal/kg, respectively, and these values were within the 95% confidence interval of the DE (2,285 kcal/kg), ME (2,217 kcal/kg), and NE (961 kcal/kg) estimated by linear regression. In conclusion, increasing the inclusion of wheat bran in a corn–soybean meal based diet reduced energy and nutrient digestibility and heat production as well as DE, ME, and NE of diets, but values for DE, ME, and NE for wheat bran determined using the difference procedure were not different from values determined using linear regression。
翻譯：朱滔

畜牧編輯

玉米豆粕型日糧中麥麩含量的增加可以顯著降低能量和養分的消化率、產熱量、日糧能量（消化能、代謝能、凈能），但是不同方法（差值法和回歸法）得到的麥麩能值無顯著差異。