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復雜日糧和蘇氨酸對保育豬營養物質消化率、能氮平衡和體組成的影響
試驗研究了復雜日糧和蘇氨酸對保育豬能量和養分消化率的影響。選用32頭保育豬（初重7.23±0.48kg）隨機分至2（簡單日糧、復雜日糧）×2（NRC，9kg仔豬蘇氨酸推薦量100%、115%）雙因子試驗設計。簡單日糧以玉米、小麥和豆粕為基礎配制，復雜日糧中添加有魚粉、血漿、乳清粉等。仔豬在代謝籠中單獨飼喂，自由采食試驗日糧。試驗期包括7天適應期，5天全收糞、尿。第14天，將所有仔豬屠宰，檢測體組成。
與簡單日糧相比，復雜日糧中灰分全腸道表觀消化率、尿能排出有提高趨勢（P＜0.10）。復雜日糧消化能和凈能含量顯著高于簡單日糧（P＜0.05）。此外，復雜日糧組第14天血漿尿素氮水平顯著低于簡單日糧組（P＜0.05）。蘇氨酸的添加降低了酸性洗滌纖維的全腸道表觀消化率（P＜0.05），但是有降低尿氮排放、提高氮沉積和體組織氮的趨勢（P＜0.10）。
總之，簡單日糧消化能和凈能含量低于復雜日糧。無論是簡單日糧還是復雜日糧，提高蘇氨酸水平都可以改善氮利用率和體蛋白沉積。
Diet complexity and L-threonine supplementation: effects on nutrient digestibility, nitrogen and energy balance, and body composition in nursery pigs
This study was conducted to investigate the effects of dietary complexity and L-Thr supplementation on energy and nutrient utilization in nursery pigs. Thirty-two nursery pigs (7.23 ± 0.48 kg) were randomly assigned to a 2 × 2 factorial treatment arrangement based on diet complexity (complex vs. simple) with different levels of L-Thr supplementation. The complex diet contained animal protein sources (e.g., fish meal and plasma) and a dairy product (e.g., dried whey) to mimic a conventional nursery diet. The simple diet was formulated with corn, wheat, and soybean meal. Both diets were supplemented with L-Thr to contain either 100% or 115% (SUP Thr) of the estimated standardized ileal digestible Thr requirement for 9 kg body weight pigs (NRC, 2012). The pigs were individually housed in metabolism crates and fed an experimental diet ad libitum for a 7-d adaptation period and 5 d of total but separate urine and fecal collection. On day 14, all pigs were euthanized to determine body composition. The diet complexity, L-Thr supplementation, and their interactions were considered main effects. Pigs fed the complex diet tended to exhibit greater (P < 0.10) apparent total tract digestibility (ATTD) of ash and urinary energy output than those fed the simple diet. The complex diet had greater (P < 0.05) digestible energy and net energy contents than the simple diet. Furthermore, the complex diet-fed pigs had lower (P < 0.05) plasma urea nitrogen concentration on day 14 than simple diet-fed pigs. The SUP Thr decreased (P < 0.05) ATTD of acid detergent fiber but trended (P < 0.10) toward a decrease in urinary nitrogen (N) output and an increase in N retention and body N mass. In conclusion, the simple diet for nursery pigs had lower digestible and net energy contents than a complex diet. The SUP Thr can improve N utilization and body protein deposition, irrespective of diet complexity.
文章來源：豬營養國際論壇
【免責聲明】：文章來源于網絡，我們對文中陳述觀點判斷保持中立，并不對文章觀點負責。僅供讀者參考。版權屬于原作者。
與簡單日糧相比，復雜日糧中灰分全腸道表觀消化率、尿能排出有提高趨勢（P＜0.10）。復雜日糧消化能和凈能含量顯著高于簡單日糧（P＜0.05）。此外，復雜日糧組第14天血漿尿素氮水平顯著低于簡單日糧組（P＜0.05）。蘇氨酸的添加降低了酸性洗滌纖維的全腸道表觀消化率（P＜0.05），但是有降低尿氮排放、提高氮沉積和體組織氮的趨勢（P＜0.10）。
總之，簡單日糧消化能和凈能含量低于復雜日糧。無論是簡單日糧還是復雜日糧，提高蘇氨酸水平都可以改善氮利用率和體蛋白沉積。
Diet complexity and L-threonine supplementation: effects on nutrient digestibility, nitrogen and energy balance, and body composition in nursery pigs
This study was conducted to investigate the effects of dietary complexity and L-Thr supplementation on energy and nutrient utilization in nursery pigs. Thirty-two nursery pigs (7.23 ± 0.48 kg) were randomly assigned to a 2 × 2 factorial treatment arrangement based on diet complexity (complex vs. simple) with different levels of L-Thr supplementation. The complex diet contained animal protein sources (e.g., fish meal and plasma) and a dairy product (e.g., dried whey) to mimic a conventional nursery diet. The simple diet was formulated with corn, wheat, and soybean meal. Both diets were supplemented with L-Thr to contain either 100% or 115% (SUP Thr) of the estimated standardized ileal digestible Thr requirement for 9 kg body weight pigs (NRC, 2012). The pigs were individually housed in metabolism crates and fed an experimental diet ad libitum for a 7-d adaptation period and 5 d of total but separate urine and fecal collection. On day 14, all pigs were euthanized to determine body composition. The diet complexity, L-Thr supplementation, and their interactions were considered main effects. Pigs fed the complex diet tended to exhibit greater (P < 0.10) apparent total tract digestibility (ATTD) of ash and urinary energy output than those fed the simple diet. The complex diet had greater (P < 0.05) digestible energy and net energy contents than the simple diet. Furthermore, the complex diet-fed pigs had lower (P < 0.05) plasma urea nitrogen concentration on day 14 than simple diet-fed pigs. The SUP Thr decreased (P < 0.05) ATTD of acid detergent fiber but trended (P < 0.10) toward a decrease in urinary nitrogen (N) output and an increase in N retention and body N mass. In conclusion, the simple diet for nursery pigs had lower digestible and net energy contents than a complex diet. The SUP Thr can improve N utilization and body protein deposition, irrespective of diet complexity.
文章來源：豬營養國際論壇
【免責聲明】：文章來源于網絡，我們對文中陳述觀點判斷保持中立，并不對文章觀點負責。僅供讀者參考。版權屬于原作者。
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