Condensed tannins are only partially responsible for variations in nutrient digestibilities of sorghum grain cultivars

Robert Glenn Elkin, Marisue B. Freed, Bruce R. Hamaker, Ye Zhang, Carl M. Parsons

Research output: Contribution to journalArticle

61 Citations (Scopus)

Abstract

Nitrogen-corrected true metabolizable energy (TMEn) and true amino acid digestibility values were determined, using cecectomized cockerels, for 20 sorghum [Sorghum bicolor (L.) Moench] cultivars that ranged in catechin equivalent (CE) percentages from 0 to 3.88. There were significant (P ≤ 0.01) overall inverse relationships between CE content and (1) the individual digestibilities of lysine, methionine, threonine, isoleucine, leucine, valine, phenylalanine, histidine, and arginine; (2) the mean digestibility of essential amino acids; (3) the mean digestibility of nonessential amino acids; and (4) TMEn values. In contrast to these overall trends, several cultivars of similar condensed tannin content had markedly different nutrient digestibilities. The dissimilarity of protein digestibilities in sorghum genotypes of similar tannin content was confirmed by subjecting samples of the ground grains to in vitro pepsin digestion with subsequent visualization of the undigested proteins by SDS-PAGE. The present work suggests that other components besides tannins are responsible for variations in the availability of nutrients in sorghum.

Original languageEnglish (US)
Pages (from-to)848-853
Number of pages6
JournalJournal of agricultural and food chemistry
Volume44
Issue number3
StatePublished - Mar 1 1996

Fingerprint

Proanthocyanidins
Sorghum
Catechin
Tannins
grain sorghum
proanthocyanidins
Nutrients
digestibility
Amino Acids
Food
Essential Amino Acids
Sorghum (Poaceae)
Isoleucine
Pepsin A
Valine
nutrients
cultivars
Threonine
Phenylalanine
Histidine

All Science Journal Classification (ASJC) codes

  • Chemistry(all)
  • Agricultural and Biological Sciences(all)

Cite this

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title = "Condensed tannins are only partially responsible for variations in nutrient digestibilities of sorghum grain cultivars",
abstract = "Nitrogen-corrected true metabolizable energy (TMEn) and true amino acid digestibility values were determined, using cecectomized cockerels, for 20 sorghum [Sorghum bicolor (L.) Moench] cultivars that ranged in catechin equivalent (CE) percentages from 0 to 3.88. There were significant (P ≤ 0.01) overall inverse relationships between CE content and (1) the individual digestibilities of lysine, methionine, threonine, isoleucine, leucine, valine, phenylalanine, histidine, and arginine; (2) the mean digestibility of essential amino acids; (3) the mean digestibility of nonessential amino acids; and (4) TMEn values. In contrast to these overall trends, several cultivars of similar condensed tannin content had markedly different nutrient digestibilities. The dissimilarity of protein digestibilities in sorghum genotypes of similar tannin content was confirmed by subjecting samples of the ground grains to in vitro pepsin digestion with subsequent visualization of the undigested proteins by SDS-PAGE. The present work suggests that other components besides tannins are responsible for variations in the availability of nutrients in sorghum.",
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Condensed tannins are only partially responsible for variations in nutrient digestibilities of sorghum grain cultivars. / Elkin, Robert Glenn; Freed, Marisue B.; Hamaker, Bruce R.; Zhang, Ye; Parsons, Carl M.

In: Journal of agricultural and food chemistry, Vol. 44, No. 3, 01.03.1996, p. 848-853.

Research output: Contribution to journalArticle

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T1 - Condensed tannins are only partially responsible for variations in nutrient digestibilities of sorghum grain cultivars

AU - Elkin, Robert Glenn

AU - Freed, Marisue B.

AU - Hamaker, Bruce R.

AU - Zhang, Ye

AU - Parsons, Carl M.

PY - 1996/3/1

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N2 - Nitrogen-corrected true metabolizable energy (TMEn) and true amino acid digestibility values were determined, using cecectomized cockerels, for 20 sorghum [Sorghum bicolor (L.) Moench] cultivars that ranged in catechin equivalent (CE) percentages from 0 to 3.88. There were significant (P ≤ 0.01) overall inverse relationships between CE content and (1) the individual digestibilities of lysine, methionine, threonine, isoleucine, leucine, valine, phenylalanine, histidine, and arginine; (2) the mean digestibility of essential amino acids; (3) the mean digestibility of nonessential amino acids; and (4) TMEn values. In contrast to these overall trends, several cultivars of similar condensed tannin content had markedly different nutrient digestibilities. The dissimilarity of protein digestibilities in sorghum genotypes of similar tannin content was confirmed by subjecting samples of the ground grains to in vitro pepsin digestion with subsequent visualization of the undigested proteins by SDS-PAGE. The present work suggests that other components besides tannins are responsible for variations in the availability of nutrients in sorghum.

AB - Nitrogen-corrected true metabolizable energy (TMEn) and true amino acid digestibility values were determined, using cecectomized cockerels, for 20 sorghum [Sorghum bicolor (L.) Moench] cultivars that ranged in catechin equivalent (CE) percentages from 0 to 3.88. There were significant (P ≤ 0.01) overall inverse relationships between CE content and (1) the individual digestibilities of lysine, methionine, threonine, isoleucine, leucine, valine, phenylalanine, histidine, and arginine; (2) the mean digestibility of essential amino acids; (3) the mean digestibility of nonessential amino acids; and (4) TMEn values. In contrast to these overall trends, several cultivars of similar condensed tannin content had markedly different nutrient digestibilities. The dissimilarity of protein digestibilities in sorghum genotypes of similar tannin content was confirmed by subjecting samples of the ground grains to in vitro pepsin digestion with subsequent visualization of the undigested proteins by SDS-PAGE. The present work suggests that other components besides tannins are responsible for variations in the availability of nutrients in sorghum.

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