Concentrations of specific phenolic compounds in six red sorghums influence nutrient utilisation in broiler chickens

Comparative performance of broiler chickens offered nutritionally equivalent diets based on six diverse, ‘tannin-free’ sorghum varieties with quantified concentrations of phenolic compounds, kafirin, and phytate

“…Conjugated ferulic acid was negatively correlated with ME : GE ratios (r = -0.919; P < 0.015) and bound ferulic acid in combination with conjugated vanillic acid was negatively correlated with AME (r = -0.990; P < 0.005). Khoddami et al (2015) reported negative correlations between conjugated ferulic acid with AME (r = -0.808; P = 0.052), ME : GE ratios (r = -0.831; P = 0.042) and AMEn (r = -0.769; P = 0.074) in a recent study involving six red sorghum cultivars. Thus, the implication is that phenolic acids have a deleterious impact on energy utilisation in broilers offered sorghum-based diets.…”

“…Concentrations of polyphenols, free, conjugated, bound and total phenolic acids are recorded in Tables 3-7 inclusive. The complex methodologies used in their quantification have been documented by Khoddami et al (2015).…”

“…Condensed tannin would be a contributing factor to this disparity if it were present in grain sorghum (Nyachoti et al 1997); however, sorghum crops now grown in Australia almost certainly do not contain condensed tannin . The present study follows two similar studies by Khoddami et al (2015) and Truong et al (2015a). In the first study sorghum-casein diets containing 809 g/kg of six red sorghum varieties were offered to broilers from 7 to 23 days post-hatch.…”

“…Based on the Clorox bleach test (Waniska et al 1992), the six sorghum varieties used in this study possessed non-pigmented testas and thus did not contain condensed tannin. However, the established anti-nutritive properties of condensed tannin may extend to the balance of phenolic compounds, which are abundant in sorghum, and the anti-nutritive properties of phenolic compounds are not solely the province of condensed tannin as proposed by Khoddami et al (2015). It is widely held that the close proximity of kafirin protein bodies to starch granules in sorghum endosperm interferes with starch utilisation (Taylor 2005).…”

Efeito do déficit hí­drico e CO₂ elevado sobre substâncias fenólicas e ligninas do sorgo var. &#39;BRS 330&#39;

“…Contudo, o presente experimento revelou que sob maior tempo de exposição a uma condição de déficit hídrico severo, a condição de CO2 elevado aparentemente não consegue atenuar perdas em relação às substâncias fenólicas da parede celular. De qualquer forma, o conteúdo de lignina observado no colmo, aos 120 DAP, foi próximo aos valores de 129,9 g/kg e 167,9 g/kg reportados para Sorghum sudanense, espécie próxima a Sorghum bicolor e usada principalmente como forrageira (Fukushima et al, 2015 (Khoddami et al, 2015), valores mais baixos que os híbridos comerciais do Sul da África (Chiremba et al, 2012). Em outras variedades de sorgo de pericarpo vermelho (QL33/QL36, 'B923296' e 'QL33') da Austrália foram reportados valores ainda mais baixos, 1,86 a 6,69 mg/kg para ácido p-cumárico e 52,20 a 80,89 mg/kg para ácido ferúlico (Wu et al, 2017c).…”