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- W1990672829 abstract "Abstract Measurements of precaecal amino acid digestibility with digesta sampled from slaughtered animals may be affected by the chosen length of the sampled section. The length needs standardization, therefore, when digestibility is understood to be a measure of feedstuff potential. It was our objective to study the change in the net disappearance of amino acids from the lower small intestine of broiler chicken. The section between Meckel's diverticulum and 2 cm anterior of the ileo-caeco-colonic junction was cut into three subsections of equal length: proximal, medial, and terminal. The contents of each subsection were pooled within the birds of each pen (12 in Experiment 1 and 10 in Experiment 2). TiO2 was used as an indigestible marker. Prior to digesta sampling, broilers had been fed the experimental diets for seven days. In Experiment 1, two diets with either soybean meal or a mix of soybean meal and peas as the main protein sources were used. Each diet was allocated to eight pens and feeding commenced on day 14 of age. Net disappearance was significantly affected by diet only in regard to aspartic acid and methionine. No significant interaction between diet and subsection occurred. Net disappearance was significantly affected by subsection for all amino acids. It ranged from 74 – 92% for individual amino acids without significant differences in the medial and terminal subsections. Net disappearance was, however, between 3% and 9% lower in the proximal subsection. In Experiment 2, diets contained soybean meal as the main protein source and were given to 18 pens from day 22 of age. Again, the effect of subsection on net disappearance was significant for all amino acids. Net disappearance was significantly lower in the proximal than in the middle subsection, and differences ranged from 5 – 10%. Significant differences in the net disappearance were also found for most of the amino acids between the middle and the terminal subsection ranging from 2 – 4%. In conclusion, when precaecal amino acid digestibility should be used as a measure for a protein source's potential, digesta sampling should not consider the proximal third of the section between Meckel's diverticulum and the end of the ileum." @default.
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- W1990672829 date "2005-08-01" @default.
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- W1990672829 title "Studies on the intestine section to be sampled in broiler studies on precaecal amino acid digestibility" @default.
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- W1990672829 doi "https://doi.org/10.1080/17450390500217058" @default.
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