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      复杂日粮和苏氨酸对保育猪营养物质消化率、能氮平衡和体组成的影响

      发布单位:天津瑞孚农牧科技集团有限公司

      查看次数:353

      时间:2020-06-04
             试验研究了复杂日粮和苏氨酸对保育猪能量和养分消化率的影响。选用32头保育猪(初重7.23±0.48kg)随机分至2(简单日粮、复杂日粮)×2(NRC,9kg仔猪苏氨酸推荐量100%、115%)双因子试验设计。简单日粮以玉米、小麦和豆粕为基础配制,复杂日粮中添加有鱼粉、血浆、乳清粉等。仔猪在代谢笼中单独饲喂,自由采食试验日粮。试验期包括7天适应期,5天全收粪、尿。第14天,将所有仔猪屠宰,检测体组成。

             与简单日粮相比,复杂日粮中灰分全肠道表观消化率、尿能排出有提高趋势(P<0.10)。复杂日粮消化能和净能含量显著高于简单日粮(P<0.05)。此外,复杂日粮组第14天血浆尿素氮水平显著低于简单日粮组(P<0.05)。苏氨酸的添加降低了酸性洗涤纤维的全肠道表观消化率(P<0.05),但是有降低尿氮排放、提高氮沉积和体组织氮的趋势(P<0.10)。

             总之,简单日粮消化能和净能含量低于复杂日粮。无论是简单日粮还是复杂日粮,提高苏氨酸水平都可以改善氮利用率和体蛋白沉积。

      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.

      文章来源:猪营养国际论坛
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