Abstract
The objective was to select from among 24 sorghum genotypes the superior ones for silage production. The study was conducted in the experimental field of Embrapa Maize & Sorghum, in the municipality of Sete Lagoas, Minas Gerais State. It used 24 forage sorghum genotypes, 21 being hybrids from the crossing of grain sorghum females and forage males (12F38019, 12F38006, 12F40006, 12F40005, 12F40019, 12F37016, 12F37005, 12F37043, 12F39006, 12F39005, 12F39019, 12F38005, 12F38007, 12F37007, 12F39007, 12F40007, 12F38014, 12F37014, 12F39014, 12F40014 e 12F38009) and three witnesses: BRS 610, BRS 655 and Volumax. It estimated productivity per area, in vitro dry matter digestibility, and assessed the bromatological and fermentation characteristics of sorghum silage. In vitro dry matter digestibility, unavailable protein in neutral detergent, neutral detergent fiber corrected for ashes and protein, acid detergent fiber, hemicellulose and lignin differed as to the genotypes tested. The pH and the ammoniacal nitrogen of the silage also showed differences between genotypes. Most of the genotypes tested are favorable for silage production, except the hybrid with higher lignin content 12F370014, and the hybrids 12F37007 and 12F370014, which showed the highest NDFap values.
Highlights
In Brazil, due to climatic conditions, the availability of forage is uneven throughout the year, with alternating periods of excess or shortage of pasture
A total of 24 forage sorghum genotypes were used, of which 21 were hybrids obtained from the crossing between grain sorghum females and forage males, and 3 were witnesses: BRS 610, BRS 655 e VOLUMAX
The pre-dried samples were ground in a ‘Willey’ type mill with a 1mm mesh sieve, and packed in glass flasks with screw cap identified for further analysis of food chemical composition: dry matter, ashes, crude protein, neutral detergent fiber corrected for ashes and protein, acid detergent fiber and lignin (Detmann et al, 2012)
Summary
In Brazil, due to climatic conditions, the availability of forage is uneven throughout the year, with alternating periods of excess or shortage of pasture. The sorghum crop (Sorghum bicolor (L.) Moench) stands out for its rusticity, high biomass production and great tolerance to water deficit. These characteristics, coupled with its energetic efficiency, allow its cultivation in arid and semi-arid zones, with production in different seasons and regions. Sorghum is a favorable plant for the ensiling process due to its phenotypic characteristics that determine ease of planting, handling, harvesting and storing. It is chemically composed of a high concentration of soluble carbohydrates that are essential for an adequate lactic acid fermentation of
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