9397至尊信誉威尼斯

不溶性纤维和日粮配置方法对生长猪能量和养分消化率的影响

发布单位:9397至尊信誉农牧科技集团有限企业

查看次数:394

时间:2020-06-16
      本试验的主要目的在于研究不同DDGS水平和日粮配置方法(稳定法和浮动法)的差异。试验选用21头生长母猪(初始体重33.1±0.4kg),安装回肠瘘管,随机分至7个日粮处理,试验为3×7拉丁方设计。

      试验处理包括基础日粮,不同DDGS水平(15%、30%、45%)×不同配制方法:1)稳定法,恒定的营养:和基础日粮营养水平一致;2)浮动法,恒定的原料:DDGS等比例替代玉米,但其他饲料原料保持不变,营养水平是浮动的。日粮中添加0.5%三氧化二铬作为指示剂。

      数据显示,DDGS水平的增加降低了干物质、总能、淀粉、必需氨基酸、淀粉的回肠表观消化率(P<0.05)。在稳定法下,赖氨酸、蛋氨酸、苏氨酸和色氨酸消化率的降低量更大(P<0.05)。在稳定法下,半纤维素消化率的降低量低于在浮动法情况下(P=0.045)。DDGS水平和配制方法对酸解粗脂肪的回肠表观消化率有互作(P=0.015);在稳定法下,DDGS水平从0%提高到30%降低了酸解粗脂肪的表观消化率,而30%和45%之间没有明显差异,在浮动法下,DDGS添加量对粗脂肪消化率没有影响。DDGS添加量的增加降低了干物质、总能、日粮纤维的全肠道表观消化率(P<0.05),而酸性洗涤纤维不受影响。在稳定法下,不溶性纤维和总日粮纤维消化率的降低量低于浮动法(P<0.05)。与浮动法相比,稳定法测得的酸解粗蛋白全肠道表观消化率降低(P<0.01)。

      总之,以DDGS的形式增加不可溶纤维水平,降低了大部分日粮养分的消化率,包括干物质、总能、淀粉、不溶性纤维和氨基酸。稳定法和浮动法在评估干物质、总能、淀粉、粗蛋白和氨基酸的消化率时是一致的(以蛋白形式存在的氨基酸)。这两种方法的差异主要在不溶性纤维、脂肪和必需氨基酸(以合成氨基酸的形式)。


Impact of increasing the levels of insoluble fiber and on the method of diet formulation measures of energy and nutrient digestibility in growing pigs

The objective of this study was to determine the differences in response to distillers dried grains with solubles (DDGS) level under constant nutrient or floating nutrient concentrations. A total of 21 ileal-cannulated gilts (33.1 ± 0.4 kg body weight) were randomly allotted to one of seven dietary treatments in a 3-period incomplete Latin square design (n = 9). Treatments consisted of a 0% DDGS basal diet, plus diets containing 15%, 30%, or 45% DDGS. Diets were formulated using one of two different formulation methods: 1) constant nutrient (CNU) where nutrients were held equal to the basal diet or 2) constant ingredients (CIN) where DDGS were added at the expense of corn and all other ingredients remained constant, so nutrient levels were allowed to “float.” Chromic oxide was added to the diets at 0.5% as an indigestible marker. Increasing the level of DDGS decreased the apparent ileal digestibility (AID) of dry matter (DM), gross energy (GE), starch, dispensable amino acids (AA), and fiber components (P < 0.050). The decrease in the AID of Lys, Met, Thr, and Trp was more pronounced under CNU compared with the CIN formulation method (P < 0.050). The decrease in the AID of hemicellulose was less pronounced under CNU compared with the CIN formulation method (P = 0.045). There was a DDGS level × formulation method interaction for the AID of acid hydrolyzed ether extract (AEE; P = 0.015); for the CNU formulation method, increasing level of DDGS decreased the AID of AEE from 0% to 30% and remained similar from 30% to 45% DDGS, whereas the CIN had no effect on the AID of AEE. Increasing the level of DDGS decreased the apparent total tract digestibility (ATTD) of DM, GE, and fiber components (P < 0.050), except for acid detergent fiber, which was not affected. The decrease in the ATTD of insoluble dietary fiber and total dietary fiber was less pronounced under CNU compared with CIN (P < 0.050). The ATTD of AEE decreased for CNU compared with CIN (P < 0.010). In conclusion, increasing the insoluble fiber level in the form of DDGS decreased the digestibility of most dietary components, including DM, GE, starch, insoluble fiber, and AA. The CNU and CIN formulation methods are equivalent when evaluating the digestibilities of DM, GE, starch, crude protein, and AA (when they were not added in purified synthetic forms). Differences between CNU and CIN formulation methods were detected for the digestibility of insoluble fiber, fat, and essential AA (when added as crystalline AA).

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