非结合氨基酸内含物和淀粉蛋白消化动力学对两种粗蛋白浓度小麦饲粮肉鸡生长性能的影响

IF 6.3
Shemil P. Macelline , Michael T. Kidd , Peter V. Chrystal , Mehdi Toghyani , Peter H. Selle , Sonia Y. Liu
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引用次数: 0

摘要

本试验的主要目的是研究标准饲粮、降低粗蛋白质饲粮和小麦饲粮中非结合氨基酸(NBAA)含量高低对肉鸡生长性能的影响。饲粮按210或180 g/kg粗蛋白质配制,210 g/kg粗蛋白质饲粮中NBAA含量为12.1或21.1 g/kg, 180 g/kg粗蛋白质饲粮中NBAA含量为44.0或55.5 g/kg。不同配方还会产生不同的饲粮淀粉与蛋白质比例,从而影响淀粉-蛋白质消化动力学。4种饲粮处理中,每组7个重复,每组15只鸡,孵化后14 ~ 35 d饲养,共420只雄性罗斯308鸡。测定生长性能、相对腹部脂肪垫重量、胸肌和腿胫产量。测定回肠淀粉和蛋白质(N)消化率系数、消失率和淀粉与蛋白质的消失率比。在孵化后35 d测定16种氨基酸的表观回肠消化率系数和消失率,在孵化后34 d测定20种氨基酸在全身血浆中的游离浓度。从210 g/kg CP饲粮过渡到180 g/kg CP饲粮,使增重降低11.3% (1742 g/kg对1964 g/kg),饲料转化率降低10.4% (1.606 g/kg对1.455 g/kg),尽管这两个参数都受到处理相互作用的影响。治疗相互作用(P <这是因为在210 g/kg CP饲粮中,高NBAA含量显著提高了4.17%(1.424比1.486),而在180 g/kg CP饲粮中,高NBAA含量显著降低了3.36%(1.632比1.579)。二次元关系(r = 0.860;P & lt;饲粮NBAA夹杂物与饲料转化率之间的差异为0.001),说明当NBAA夹杂物超过18.5 g/kg时,饲料转化效率下降。然而,多元线性回归(r = 0.913;P & lt;0.001),其中NBAA包涵体和分析的膳食淀粉:蛋白质比显著(P <0.001),与FCR相关。由此可见,小麦基饲粮中NBAA添加量与淀粉/蛋白质比对肉鸡生长性能有显著影响,并考虑了可能的影响机制。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
The influence of non-bound amino acid inclusions and starch-protein digestive dynamics on growth performance of broiler chickens offered wheat-based diets with two crude protein concentrations

The primary objective of this study was to investigate the influence of high and low inclusions of non-bound amino acid (NBAA) in standard and reduced-crude protein (CP), wheat-based diets on growth performance in broiler chickens. Dietary treatments were formulated to either 210 or 180 g/kg CP. The 210 g/kg CP diets contained either 12.1 or 21.1 g/kg NBAA and 180 g/kg CP diets contained either 44.0 or 55.5 g/kg NBAA. The formulations also generated different dietary starch:protein ratios which impacted on starch-protein digestive dynamics. Each of the four dietary treatments were offered to 7 replicates of 15 birds housed in floor pens from 14 to 35 days post-hatch or a total of 420 male Ross 308 chickens. Growth performance, relative abdominal fat-pad weights, breast muscle and leg shank yields were determined. Ileal starch and protein (N) digestibility coefficients, disappearance rates and starch:protein disappearance rate ratios were defined. Apparent ileal digestibility coefficients and disappearance rates of 16 amino acids were determined at 35 days post-hatch and free concentrations of 20 amino acids in systemic plasma were determined at 34 days post-hatch. The transition from 210 to 180 g/kg CP diets depressed weight gain by 11.3% (1742 versus 1964 g/bird) and FCR by 10.4% (1.606 versus 1.455), although both parameters were subject to treatment interactions. The treatment interaction (P < 0.001) observed for FCR was because high NBAA inclusions significantly improved FCR by 4.17% (1.424 versus 1.486) in birds offered 210 g/kg CP diets, but significantly depressed FCR by 3.36% (1.632 versus 1.579) in 180 g/kg CP diets. A quadratic relationship (r = 0.860; P < 0.001) between dietary NBAA inclusions and FCR was detected, which indicated that when NBAA inclusions exceed 18.5 g/kg efficiency of feed conversion deteriorated. However, a multiple linear regression (r = 0.913; P < 0.001) was detected for FCR where both NBAA inclusions and analysed dietary starch:protein ratios were significantly (P < 0.001) related to FCR. This relationship indicates that growth performance of broiler chickens offered wheat-based diets is strongly influenced by dietary NBAA inclusions coupled with dietary starch:protein ratios and consideration is given to the possible underlying mechanisms.

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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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