Studies on the secretion of amino acids and of urea into the gastro intestinal tract of pigs

In the absence of sufficient energy from a carbohydrate source, the GIT microflora can also use protein as a source of energy, by splitting amino acids leading to the formation of volatile fatty acids and ammonia (NH3). Therefore, it is hypothesized that the addition of fermentable carbohydrates to an animal diet, could reduce the concentration of NH3 of the gastro-intestinal tract (GIT) digesta, particularly in relation to the area where the fermentation takes place.

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Accretion of total protein and individual amino acids by organs and tissues of growing lambs and the ability of nitrogen balance techniques to quantitate protein retention

Animal Science ◽

10.1017/s000335610000684x ◽

1993 ◽

Vol 57 (2) ◽

pp. 237-245 ◽

Cited By ~ 14

Author(s):

J. C. MacRae ◽

A. Walker ◽

D. Brown ◽

G. E. Lobley

Keyword(s):

Amino Acids ◽

Body Weight ◽

Intestinal Tract ◽

Live Weight ◽

N Balance ◽

Total Amino Acid ◽

Total N ◽

Comparative Slaughter ◽

Total Body ◽

Gastro Intestinal Tract

AbstractTwelve Suffolk-Finn Dorset lambs were reared from 25 to 40 or 25 to 55 kg body weight on either pelleted dried grass or a ration of pelleted grass plus barley (ratio 1:1) in a comparative slaughter experiment designed to determine the amounts of total nitrogen and individual amino acids accreted in different body components during growth. Nitrogen (N) balance measurements were determined frequently during this growth phase and accumulated N retentions were compared with the total N accretion determined by comparative slaughter. Total N and individual amino acids accumulated in carcass, wool, skin, offal and blood, head and feet, gastro-intestinal tract and liver were linearly related to body weight in all cases other than for cysteine in carcass. At 25 kg live weight, proportionately 0·52 of total body N was in carcass components, 0·115 in wool, 0·08 in skin, 0·10 in offal and blood, 0·095 in head and feet, 0·06 in the gastro-intestinal tract and 0·02 in liver. However as the animals grew from 25 to 55 kg, 0·256 of the total N accretion was in wool, which was rich in cysteine (98 g/kg total amino acid). Carcass accretion represented only 0·449 of total body N accretion. The N balance technique overestimated net protein accretion by 0·24 (s.e. 0·036).

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1.2 Post-Ruminal Digestion and the Utilization of Nitrogen

BSAP Occasional Publication ◽

10.1017/s0263967x0003038x ◽

1982 ◽

Vol 6 ◽

pp. 13-22 ◽

Cited By ~ 1

Author(s):

D. B. Lindsay ◽

D. G. Armstrong

Keyword(s):

Amino Acids ◽

Small Intestine ◽

Nucleic Acids ◽

Intestinal Tract ◽

Preceding Paper ◽

Current Understanding ◽

Ruminant Animal ◽

Gastro Intestinal Tract ◽

Ruminal Digestion ◽

Microbial Mass

The preceding paper has detailed our current understanding of the processes of N digestion in the ruminant animal as they relate to the events occurring within the reticulo-rumen. It is the purpose of this paper to consider the processes of digestion occurring principally within the small intestine and to comment on the significance of events occurring within the caecum and colon in so far as they relate to nitrogen digestion. The fate of amino acids subsequent to their absorption from the gastro-intestinal tract will also be discussed, in particular the way they are catabolized and whether this limits their availability for the synthesis of protein. Reference will also be made to purine and pyrimidine nitrogen; these products arise from the considerable content of nucleic acids in the microbial mass which leaves the reticulo-rumen and undergoes digestion in the small intestine.

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Studies on the secretion of amino acids and of urea into the gastro intestinal tract of pigs

Archiv für Tierernaehrung ◽

10.1080/17450398609425236 ◽

1986 ◽

Vol 36 (1) ◽

pp. 17-24 ◽

Cited By ~ 3

Author(s):

Teresa Zebrowska ◽

R. Münchmeyer ◽

H. Bergner ◽

O. Simon

Keyword(s):

Amino Acids ◽

Intestinal Tract ◽

Gastro Intestinal Tract

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Studies to determine energy and protein requirements of the gastro intestinal tract of pigs

Proceedings of the British Society of Animal Production (1972) ◽

10.1017/s0308229600023722 ◽

1993 ◽

Vol 1993 ◽

pp. 44-44

Author(s):

M.W. Bosch ◽

P. van Leeuwen

Keyword(s):

Amino Acids ◽

Amino Acid ◽

The Netherlands ◽

Intestinal Tract ◽

Animal Production ◽

Feed Composition ◽

Protein Requirements ◽

Gastro Intestinal Tract ◽

Digestible Amino Acids

In intensive animal production, surplusses of nitrogen (N) are polluting the environment. Therefore it is important to compose diets matching the requirements of the animals as close as possible. Untill now mostly apparently digestible N or amino acids (feacal) have been used as criteria. It is also well established that amino acids disappearing from the hindgut do not contribute much to amino acid supply of the animal. Moreover, big differences between ileal digestible amino acids and faecal digestible amino acids are found, depending on the feed composition. Because the amounts of absorbed amino acids is more reflected by the amounts of ileal digestible amino acids than by the amounts of faecal digestible amino acids, contents of the ileal digestible amino acids of the commonly used feed stuffs in the Netherlands have been determined. Diets can now be formulated on contents of ileal digestible amino acids.

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