Nutritional characteristics of bmr mutant and normal sorghum genotypes used for cutting and grazing

Poliana Batista De Aguilar,Daniel Ananias De Assis Pires,Sidnei Tavares Reis,Vicente Ribeiro Rocha Júnior,José Avelino Santos Rodrigues,Benara Carla Barros Frota

doi:10.4025/actascianimsci.v36i3.21284

Poliana Batista De Aguilar, Daniel Ananias De Assis Pires + Show 4 more

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https://doi.org/10.4025/actascianimsci.v36i3.21284

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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.

Highlights

In Brazil there is a marked seasonality in forage production, which makes production systems mostly dependent on the planning for use of conserved forage or forage with high drought tolerance
Regarding dry matter (DM), ether extract (EE) and ash did, there were no differences between genotypes, the means were 11.87, 1.35 and 6.27%, respectively (Table 2)
The low availability of DM may have occurred because the genotypes have been cut at 42 regrowth days, since there is a positive correlation between physiological maturity and concentration of DM

Summary

Introduction

In Brazil there is a marked seasonality in forage production, which makes production systems mostly dependent on the planning for use of conserved forage or forage with high drought tolerance. Sorghum has the potential to be used as ruminant feed, especially in semi-arid regions, for being resistant to drought and high temperatures, and shows high yield and high nutritional value. Sorghum can be used for producing hay, silage and for cutting and/or grazing. The hybrids used mainly for grazing, green cutting, haying and dead mulching result from a cross between two distinct species of the genus Sorghum. To produce these hybrids, it is used as female a lineage of grain sorghum Bicolor) and as male, a lineage of sudangrass

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