日龄对肉鸡豆粕和菜籽粕标准回肠氨基酸消化率的影响

IF 6.3
Mukti Barua , M. Reza Abdollahi , Faegheh Zaefarian , Timothy J. Wester , Channarayapatna K. Girish , Peter V. Chrystal , Velmurugu Ravindran
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引用次数: 0

摘要

研究了6个日龄(7、14、21、28、35和42日龄)肉鸡两种蛋白质源(豆粕和菜籽粕)中氮(N)和氨基酸(AA)的标准化回肠消化系数(SIDC)。配制两种试验饲粮,分别以SBM (413 g/kg)和CM (553 g/kg)作为唯一的AA源。添加5 g/kg的二氧化钛作为难消化标记物。试验选用1日龄雄性肉鸡696只,每组12个重复笼。各组分别饲喂4 d,第7天(14只/笼)、第14天(12只/笼)、第21天(10只/笼)、第28天(8只/笼)、第35天(8只/笼)和第42天(6只/笼)采集回肠食糜。表观消化率系数采用特定年龄的基础内源AA流量进行标准化。在SBM组中,虽然N的SIDC倾向于受到影响(二次;P = 0.075),年龄效应对必需氨基酸(IAA)和总氨基酸(TAA)的平均SIDC没有线性或二次响应。年龄效应(二次;P & lt;SBM中可忽略氨基酸(DAA)的平均SIDC值为0.05),在第7天达到最高值,第14 ~ 28天逐渐下降,第35天以后逐渐升高。部分AA (Arg、Thr、Trp、Cys、Pro)的SIDC受到影响(P <0.05或P <0.001),随年龄呈二次曲线。在CM中,N的SIDC、IAA、DAA和TAA的平均SIDC受到(二次)影响;P & lt;0.05或P <0.001)。N的SIDC和DAA、TAA的平均SIDC在第7 ~ 14天较高,在第21天下降,第28天以后上升。IAA的平均SIDC在第7 ~ 28天较低,此后逐渐升高。个体AA的SIDC受到影响(线性或二次型;P & lt;0.05或P <0.001),不同年龄的差异有不同的数量级。年龄对SIDC AA的影响是可变的,取决于蛋白质来源和AA。结果表明,在肉鸡饲料配方中可能需要考虑特定年龄的SIDC AA数据。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Effect of age on the standardized ileal amino acid digestibility of soybean meal and canola meal in broilers

Standardized ileal digestibility coefficients (SIDC) of nitrogen (N) and amino acids (AA) in two protein sources (soybean meal [SBM] and canola meal [CM]) were investigated at six broiler ages (d 7, 14, 21, 28, 35, and 42). Two assay diets were formulated to contain either SBM (413 g/kg) or CM (553 g/kg) as the sole dietary AA source. Titanium dioxide (5 g/kg) was added as an indigestible marker. A total of 696 male broilers at 1 d old were allotted to 12 replicate cages per age group. Each assay diet was offered to birds for 4 d prior to the ileal digesta collection on d 7 (14 birds/cage), 14 (12 birds/cage), 21 (10 birds/cage), 28 (8 birds/cage), 35 (8 birds/cage) and 42 (6 birds/cage), respectively. The apparent digestibility coefficients were standardized using age-specific basal endogenous AA flows. In the SBM group, though the SIDC of N tended to be influenced (quadratic; P = 0.075) by age, no linear or quadratic response of age effect was observed on the average SIDC of indispensable (IAA) and total AA (TAA). An age effect (quadratic; P < 0.05) was observed on the average SIDC of dispensable AA (DAA) in SBM with the highest value recorded at d 7, followed by a decrease from d 14 to 28, which increased beyond d 35. The SIDC of some individual AA (Arg, Thr, Trp, Cys, Pro) were affected (P < 0.05 or P < 0.001) in a quadratic manner by age. In the CM, the SIDC of N, average SIDC of IAA, DAA and TAA were influenced (quadratic; P < 0.05 or P < 0.001) by age. The SIDC of N and average SIDC of DAA and TAA were higher from d 7 to 14, declined at d 21, and then increased beyond d 28. The average SIDC of IAA was low between d 7 and 28 and increased thereafter. The SIDC of individual AA were affected (linear or quadratic; P < 0.05 or P < 0.001) by different magnitudes by age. The age influence on the SIDC AA was variable, depending on the protein source and AA. The results demonstrate that age-specific SIDC AA data might need consideration in broiler feed formulations.

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来源期刊
Animal Nutrition
Animal Nutrition Animal Science and Zoology
CiteScore
9.70
自引率
0.00%
发文量
542
审稿时长
65 days
期刊介绍: Animal Nutrition encompasses the full gamut of animal nutritional sciences and reviews including, but not limited to, fundamental aspects of animal nutrition such as nutritional requirements, metabolic studies, body composition, energetics, immunology, neuroscience, microbiology, genetics and molecular and cell biology related to primarily to the nutrition of farm animals and aquatic species. More applied aspects of animal nutrition, such as the evaluation of novel ingredients, feed additives and feed safety will also be considered but it is expected that such studies will have a strong nutritional focus. Animal Nutrition is indexed in SCIE, PubMed Central, Scopus, DOAJ, etc.
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