Feeding Experiments with Methionine

Weichselbaum, Theodore E.; Weichselbaum, M. B.; Stewart, C. P.

doi:10.1038/129795b0

Cited by 17 publications

(6 citation statements)

References 3 publications

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“…Cysteine is a component of keratin and other fibrous proteins, and typically has a lower digestibility (Kerr et al, 2014). One must consider the low digestibility of cysteine (range from 50.22% to 68.37% in present study) and low methionine DIAAS-like value for chicken meal (78.10) when formulating diets, especially when using meals that have undergone rendering and drying processes due to the fact that cysteine is supported by the metabolism of methionine (Weichselbaum et al, 1932). If an ingredient has a low cysteine digestibility plus a methionine DIAAS-like value that does not meet 100%, supplementation of methionine or cysteine may be required to prevent deficiency.…”

Section: Discussionmentioning

confidence: 90%

Chemical composition, true nutrient digestibility, and true metabolizable energy of chicken-based ingredients differing by processing method using the precision-fed cecectomized rooster assay1

Oba

Utterback

Parsons

et al. 2018

Journal of Animal Science

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Chicken-based ingredients are commonly used in pet food products, but vary greatly in nutrient composition and processing conditions that may affect their protein quality and digestibility. Testing the quality of protein sources undergoing different processing conditions provides important information to pet food producers. The objective of this study was to determine the chemical composition, nutrient digestibility, protein, and AA digestibility scores, and nitrogen-corrected true metabolizable energy (TMEn) of chicken-based ingredients that had undergone different processing conditions (i.e., chicken meal, raw chicken, retorted chicken, and steamed chicken) using the precision-fed cecectomized rooster assay. True nutrient digestibility was variable among the protein sources (60% to 76% of DM, 66% to 81% of OM, 83% to 90% of AHF, 50% to 95% of AA and 73% to 85% of TMEn/GE). In general, the chicken meal had a lower (P < 0.05) nutrient digestibility than other ingredients tested, including DM, OM, and most indispensable and dispensable AA, with most having a true digestibility between 75% and 85%. The steamed chicken had the highest indispensable AA digestibilities, with all having a true digestibility greater than 88% and most being over 90%. TMEn value and digestible indispensable AA scores (DIAAS)-like values were higher (P < 0.0001) in the less processed chicken-based ingredients in comparison to chicken meal. Although animal proteins are often considered to be complete proteins, DIAAS-like values <100% suggest that ingredients like chicken meal may not provide all indispensable AA when included at levels to the meet minimal crude protein recommendation. Although raw protein sources are often touted as being the most digestible and of the highest quality, the steamed chicken had the highest (P < 0.0001) DIAAS-like values in this study. This study demonstrates the considerable variability that exists, not only in the chemical composition but also in the true nutrient digestibility among chicken-based ingredients undergoing different processing conditions. These data justify more in vivo testing and the use of DIAAS-like values that consider AA profile, in vivo digestibility, and species-specific recommendations, to evaluate protein-based ingredients intended for use in dog and cat foods.

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Section: Discussionmentioning

confidence: 90%

Chemical composition, true nutrient digestibility, and true metabolizable energy of chicken-based ingredients differing by processing method using the precision-fed cecectomized rooster assay1

Oba

Utterback

Parsons

et al. 2018

Journal of Animal Science

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show abstract

“…The effect of injecting methionine on wool growth was studied because, from observations of Jackson and Block (6) and Weichselbaum, Weichselbaum and Stewart (33), it might be inferred that cystine and methionine are interconvertible in metabolism. They found that the growth of rats upon the Sherman-Merrill diet was increased on the addition of methionine to their ration.…”

Section: Discussionmentioning

confidence: 99%

Studies on the relationship between nutrition and wool production of Merino sheep. II. The effect of the administration of cystine, cystein, sulphur and of methionine on the growth of wool of a Merino ewe on a protein-poor ration

Marston

1935

J. Agric. Sci.

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1. The question whether the amount of cystine in the wool grown may exceed that in the diet is discussed.2. When 1 gm. of laevo-cystine was added to the daily ration of a ewe on a low protein diet, the wool grown upon a circumscribed area was 14 per cent, more than that grown during a similar period immediately preceding. Four-fifths of the sulphur in the added cystine was absorbed, about half of which was excreted in the urine during the period the cystine was being fed.3. When 1 gm. of laevo-cystein was injected subcutaneously each day for 10 days, a 34 per cent, increase in wool growth occurred. During three succeeding periods, of 10 days each, immediately after the injections had been discontinued, the increases were 30, 18 and 7 per cent, respectively. Of the 2.6 gm. of sulphur in the cystein injected during the 10 days, 1.7 gm. was retained and could be accounted for by the extra amount of wool grown during that and the succeeding periods.

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“…Zum Antigen-Nachweis mit Hilfe der Immunfluoreszenz sind Tupfpräparate und Ausstriche von den Organen infizierter Tiere auf Objektträgern angefertigt worden. Diese Präparate wurden nach kurzer Lufttrocknung 10 Minuten lang in Aceton fixiert und, sofern sie nicht sofort weiter bearbeitet wurden, bei -20° C aufbewahrt. Für Giemsa-Färbungen verwendeten wir luftgetrocknete und Methanol-fixierte Präparate, Untersuchungen von Blut infizierter Tiere erfolgten anfänglich auf dün-nen Objektträger-Ausstrichen, später in dicken Tropfen", die nach Hämolyse und Lufttrocknung mit Aceton fixiert wurden.…”

Section: Materials Und Methodenunclassified

Antigen-Nachweis des „Marburg-Virus” in den Organen infizierter Meerschweinchen durch Immunfluoreszenz

Slenczka¹,

Shu²,

Piepenburg³

et al. 1968

Dtsch med Wochenschr

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Feeding Experiments with Methionine

Cited by 17 publications

References 3 publications

Chemical composition, true nutrient digestibility, and true metabolizable energy of chicken-based ingredients differing by processing method using the precision-fed cecectomized rooster assay1

Chemical composition, true nutrient digestibility, and true metabolizable energy of chicken-based ingredients differing by processing method using the precision-fed cecectomized rooster assay1

Studies on the relationship between nutrition and wool production of Merino sheep. II. The effect of the administration of cystine, cystein, sulphur and of methionine on the growth of wool of a Merino ewe on a protein-poor ration

Antigen-Nachweis des „Marburg-Virus” in den Organen infizierter Meerschweinchen durch Immunfluoreszenz

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