A bioavailable nutrient has the potential to be utilized when ingested. Ideally, the nutrient requirements of animals and the nutrient concentrations of feedingstuffs should be expressed in terms o...

Estimation of bioavailable amino acids in feedingstuffs for poultry and pigs: a review with emphasis on balance experiments

1. The dietary requirements for protein and amino acids of the growing gosling (0–7 weeks) were calculated according to body composition, maintenance needs and the absorption rate of amino acids from feeds.2. The diets were formulated by least-cost linear programming, using the calculated requirements for amino acids, with or without minimal glycine + serine requirements. The diets formulated without minimal requirements of glycine + serine were supplemented with various amounts of glycine, and fed to growing goslings.3. The calculated requirements for protein and essential amino acids were lower than those suggested for growing broilers and turkeys. The requirements (g/MJ metabolizable energy) at 0–2, 2–4 and 4–7 weeks of age respectively, were: lysine 0·88, 0·48, 0·43; methionine + cystine 0·48, 0·38, 0·29; protein 14·5, 9·3, 7·6.4. The goslings did not respond to glycine supplementation of the diet.

https://www.cambridge.org/core/services/aop-cambridge-core/content/view/4541649532E2D6715C5D4DCA27522F28/S0007114583001178a.pdf/div-class-title-protein-essential-amino-acids-and-glycine-requirements-of-the-growing-gosling-span-class-italic-anser-cireneus-span-a-href-fn01-ref-type-fn-a-div.pdf

Protein, essential amino acids and glycine requirements of the growing gosling (Anser cireneus)*

Amino Acid Availability in Dry Poultry Waste in Comparison with Relevant Feedstuffs

11 different feedstuffs (barley, wheat, rye, oat, wheat bran, soybean meal, peanut meal, cottonseed meal, rapeseed meal, horse bean, fish meal) were tested with adult colostomized broiler hens in digestion experiments; the digestibility of the crude protein and the amino acid (AA) balance of the gastro-intestinal tract were ascertained. The results achieved can be summarised as follows: The AA-composition in faecal protein is relatively independent of the AA-composition of the feedstuffs, it is not constant, however. The NPN-quota in faecal crude protein rises with the increasing crude fibre content in the feed. AA-digestibility calculated from the balance of the gastro-intestinal tract is, with the exception of some AA, in particularly the limiting ones, higher than the digestibility of the crude protein. As the AA-balance of the gastro-intestinal tract does not give a realistic picture of the digestibility of the AA, we recommend to ascertain the AA-balance up to the end of the small intestines in order to gain more profound knowledge with the help of such basic investigations with selected feedstuffs.

Determination of amino acid balance in the gastrointestinal tract of chickens

Availability of Amino Acids from Soybean, Corn, and Milo for Goslings

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Availability of Amino Acids from Soybean, Corn, and Milo for Goslings