復(fù)雜日糧和蘇氨酸對(duì)保育豬營養(yǎng)物質(zhì)消化率、能氮平衡和體組成的影響

發(fā)布單位:天津瑞孚農(nóng)牧科技集團(tuán)有限公司

查看次數(shù)：7886

時(shí)間：2020-06-04
       試驗(yàn)研究了復(fù)雜日糧和蘇氨酸對(duì)保育豬能量和養(yǎng)分消化率的影響。選用32頭保育豬（初重7.23±0.48kg）隨機(jī)分至2（簡(jiǎn)單日糧、復(fù)雜日糧）×2（NRC，9kg仔豬蘇氨酸推薦量100%、115%）雙因子試驗(yàn)設(shè)計(jì)。簡(jiǎn)單日糧以玉米、小麥和豆粕為基礎(chǔ)配制，復(fù)雜日糧中添加有魚粉、血漿、乳清粉等。仔豬在代謝籠中單獨(dú)飼喂，自由采食試驗(yàn)日糧。試驗(yàn)期包括7天適應(yīng)期，5天全收糞、尿。第14天，將所有仔豬屠宰，檢測(cè)體組成。

       與簡(jiǎn)單日糧相比，復(fù)雜日糧中灰分全腸道表觀消化率、尿能排出有提高趨勢(shì)（P＜0.10）。復(fù)雜日糧消化能和凈能含量顯著高于簡(jiǎn)單日糧（P＜0.05）。此外，復(fù)雜日糧組第14天血漿尿素氮水平顯著低于簡(jiǎn)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(shì)（P＜0.10）。

       總之，簡(jiǎn)單日糧消化能和凈能含量低于復(fù)雜日糧。無論是簡(jiǎn)單日糧還是復(fù)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(yǎng)國際論壇
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