<b>Nutritional characteristics of <i>bmr</i> mutant and normal sorghum genotypes used for cutting and grazing

Abstract

ABSTRACT. This study evaluated the nutritional characteristics of BMR mutant and normal sorghum genotypes, eleven BMR mutants and nine normal. Seeds were sown in a randomized block design with three blocks, in which each genotype was a treatment. The nutritional characteristics were analyzed at 42 days of regrowth after the first cut, determined for DM, EE, ash, CP, NDIN, NIDA, NDF, ADF, NFC, CT, HCEL, CEL and NGLs. Regarding DM, EE, ash, NDIN, NIDA, NDF, FDA and HCEL, there were no differences between genotypes. As for CP, there were differences, with mean levels ranging from 9.77% for BR001AXTX2785bmr to 16.45% for BR001AxTX2784. Considering CT and NFC, there were differences in the mean levels that ranged from 75.21 to 83.28% for BR007AxTX2785bmr and BR001AXTX2785bmr, and from 17.46 to 25.51% for CMSXS156AxTX2785bmr and IS10428xTX2784, respectively. In relation to CEL and LGN significant difference were detected, the mean levels varied between 22.30 and 27.94% for the IS10428xTX2784 and TX635AxTX2785bmr, and from 3.08 to 7.31% for BR007AxTX2785bmr and BR001AxTX2784, respectively. The genotypes IS10428xTX2784 and BR007AxTX2784 are the most suitable for use in ruminant feed.Keywords: forage, isogenic, mutation, brown midrib.Características nutricionais de genótipos de sorgo mutantes BMR e normais utilizados para corte e pastejo RESUMO. Objetivou-se avaliar as características nutricionais de genótipos de sorgo mutantes BMR e normais, sendo onze mutantes BMR e nove normais. A semeadura foi realizada em blocos casualizados, com três blocos onde cada genótipo foi um tratamento. As características nutricionais foram analisadas aos 42 dias de rebrotação após o primeiro corte, sendo determinados os teores de MS, EE, cinzas, PB, NIDN, NIDA, FDN, FDA, CNF, CT, HCEL, CEL e LGN. Em relação à MS, ao EE, às cinzas, ao NIDN, ao NIDA, à FDN, à FDA e à HCEL, não houve diferença entre os genótipos. Quanto à PB, houve diferença, cujos teores médios oscilaram de 9,77% para o BR001AXTX2785bmr a 16,45% para o BR001AxTX2784. Em relação aos CT e CNF, houve diferença, os teores médios variaram de 75,21% para o BR007AxTX2785bmr a 83,28% para o BR001AXTX2785bmr e de 17,46 a 25,51% para o CMSXS156AxTX2785bmr e IS10428xTX2784, respectivamente. Quanto à CEL e LGN houve diferença, os teores médios variaram de 22,30% para o IS10428xTX2784 a 27,94% para o TX635AxTX2785bmr e de 3,08% para o BR007AxTX2785bmr a 7,31% para o BR001AxTX2784, respectivamente. Os genótipos IS10428xTX2784 e o BR007AxTX2784 são os mais indicados para se utilizar na alimentação de ruminantes.Palavras-chave: forragem, isogênicos, mutação, nervura marron.

Nutrients, Fiber Fraction, and In Vitro Fiber Digestibility of Brown-Midrib Sorghum Mutant Lines Affected by The Maturity Stages

“…This result is in line with the result reported by Nohong & Islamiyati (2018) that the CP of BMR sorghum is higher than that of Samurai-2 variety (non-BMR sorghum mutant). Aguilar et al (2014) state that the BMR has a higher protein content compared to the normal non-mutant sorghum.…”

Forage-Yield and Nutrient Quality of New Brown Midrib (BMR) Mutant Lines of Sorghum

“…Most BMR mutant genotypes showed the lowest cellulose and lignin amounts (de Aguilar et al, 2014;Sattler et al, 2015), representing ADF content. However, only GH2.3 produced lower ADF and ADL values than the control varieties.…”

“…A high IVTD value in the GH2.3 mutant line relates to low lignin levels (Table 2). De Aguilar et al (2014) reported that most BMR mutant genotypes show low lignin (3.08%-5.14%) and cellulose (22.88%-24.86%) contents.…”

Dynamic expression of the nutritive values in forage sorghum populations associated with white, green and brown midrid genotypes

“…Most researches on the optimal utilization period of BMR forage sorghum have been focused on the single or two growing stages (Aydin et al, 1999;Oliver et al, 2004;Marsalis et al, 2010;Bean et al, 2013;Aguilar et al, 2014), especially, Bean et al (2013) reported the harvest stage had a significant effects on nutritive quality of BMR sudangrass. However, Which stage is the optimal utilization period for BMR forage sorghum population?…”

“…Vogler et al (2009) reported the effect of allelic variation on forage quality of BMR sorghum mutants. Aguilar et al (2014) evaluated nutritional traits of BMR mutant and normal genotypes in silage sorghum. Ledgerwood et al (2009) appraised on digestibility of a BMR mutant of sudangrass (S. sudanense (Piper) Stapf.).…”