The apparent ileal and excreta dige

The apparent ileal and excreta digestibilities of amino acids in 15 samples representing 12
food ingredients were determined using 5-week-old male broiler chickens. The ingredients included 3
samples of cereals (wheat, maize and sorghum), 6 samples of plant protein meals (soyabean meal, cottonseed
meal, canola meal and sunflower meal) and 6 samples of animal protein meals (meat meal, meat-andbone
meal, feather meal and fish meal).
2. The test ingredients were incorporated as the sole source of dietary protein in assay diets. Each diet was
offered ad libitum to 3 pens (4 birds/pen) from d 35 to d 42 post-hatching. Total collection of excreta was
carried out during the last 4 d. All birds were killed on d 42 and the contents of the lower half of the ileum
were collected. Apparent ileal and excreta amino acid digestibilities were calculated using acid-insoluble ash
as the indigestible marker.
3. The influence of site of measurement was found to vary among food ingredients, among samples within
an ingredient and among different amino acids within an ingredient. Ileal amino acid digestibility values
were similar in some ingredients, but significantly lower or higher in others than the corresponding excreta
values.
4. Average ileal and excreta amino acid digestibilities in sorghum and maize were similar, but significant
differences were observed for individual amino acids. In contrast, ileal amino acid digestibility values were
higher than the corresponding excreta digestibility values in wheat.
5. The average ileal and excreta digestibilites of amino acids in the 3 soyabean meal samples were similar
although small, but significant differences were noted for individual amino acids. Site of measurement had
no effect on the digestibility of amino acids in canola meal. Digestibilities of valine, isoleucine, phenylalanine,
histidine, glutamic acid, alanine and tyrosine in sunflower meal and those of valine, methionine,
isoleucine, leucine, lysine, glutamic acid and alanine in cottonseed meal were lower by excreta analysis.
6. Digestibilities in animal protein meals, with the exception of blood meal and fish meal, were consistently
higher by excreta analysis. Ileal-excreta differences in individual amino acid digestibilities were more evident
in feather meal, meat meal and meat-and-bone meal.
7. Threonine and valine were the indispensable amino acids that were more frequently influenced by the
site of measurement. Of the dispensable amino acids, aspartic acid, serine, glutamic acid and alanine were
the most affected.
8. Differences determined between ileal and excreta digestibilities in the present study clearly demonstrate
that amino acid metabolism by hindgut microflora in chickens may be substantial and that digestibilities
measured in the terminal ileum are more accurate measures of amino acid availability than those measured
in the excreta.

ผลลัพธ์ (ไทย) 3:

apparent）和氨基酸的回肠excreta digestibilities acids在15 12代表样本。使用食品成分是比较determined 5。3成分包括：肉，小鸡！小麦，玉米cereals样本）（样本），和sorghum 6植物蛋白（大豆），cottonseed顿餐这，这，这，canola 6和向日葵）和动物蛋白餐肉样品的meat-andbone顿（，这这这，羽毛和鱼。成分：2是法人。在测试作为一个源的dietary蛋白检测是在每形式的饮食。广告对3 offered libitum 4 pens（D）/笔从鸟类到42 35 collection of D .总excreta是post-hatching在实施了最后的死亡是所有鸟类4 D .在D 42 contents和回肠的下的。是collected回肠氨基酸和excreta。Apparent使用digestibilities是calculated acid-insoluble灰作为一个indigestible标记。3 site）的影响。对不同的测量是among食品成分，发现在among样本。一个不同的氨基酸成分和成分在一个among acids氨基酸消化率Ileal values。一些成分是类似的，但在更高的significantly下或在他人的corresponding excreta高于values。4回肠氨基酸和excreta。平均在玉米和digestibilities是类似的，但sorghum最小显著differences是观察对比。在acids为individual氨基酸回肠氨基酸消化率值是、更高的消化率值高于corresponding excreta在小麦。5）和平均excreta。digestibilites回肠氨基酸的大豆膳食acids在3是类似的样品。虽然小，但都是为individual最小显著differences说站点的测量有acids氨基酸。氨基酸消化率的影响，在acids膳食。在canola Digestibilities缬氨酸，异亮氨酸，苯丙氨酸，和Pro，Asp，谷氨酸，丙氨酸和酪氨酸和缬氨酸），这在那些向日葵，蛋氨酸，异亮氨酸，亮氨酸，赖氨酸，谷氨酸和丙氨酸在下，这是通过分析cottonseed excreta。在6。Digestibilities动物蛋白餐，与异常的血和鱼，这一直是这通过分析高等excreta Ileal-excreta differences氨基酸。在individual digestibilities更是evident这肉和羽毛，在meat-and -骨顿膳食。7是必不可少的。Threonine和缬氨酸的氨基酸是由frequently acids是更多的influenced我们的测量是dispensable。acids，天冬氨酸的氨基酸残基，谷氨酸和丙氨酸，是最affected CAC。8 Differences determined回肠和excreta之间。目前在研究demonstrate digestibilities好处这是通过在肠道氨基酸代谢和microflora可能是大量的digestibilities小鸡！测量是在回肠末端氨基酸measures更准确比那些性的测量。在excreta。