Abstract
This study aimed to evaluate in situ degradability and degradation kinetics of DM, NDF and ADF of silage, with or without tannin in the grains. Two isogenic lines of grain sorghum (CMS-XS 114 with tannin and CMS-XS 165 without tannin) and two sorghum hybrids (BR-700 dual purpose with tannin and BR-601 forage without tannin) were ensiled; dried and ground silage samples were placed in nylon bags and introduced through the fistulas. After incubation for 6, 12, 24, 48, 72 and 96 hours, bags were taken for subsequent analysis of fibrous fractions. The experimental design was completely randomized with 4 replicates and 4 treatments and means compared by Tukey’s test at 5% probability. As for the DM degradation rate, silage of CMSXS165without tannin was superior. Silages of genotypes BR700 and CMSXS 114 with tannin showed the highest values of indigestible ADF (59.54 and 43.09%). Regarding the NDF, the potential degradation of silage of CMSXS165 line without tannin was superior. Tannin can reduce ruminal degradability of the dry matter and fibrous fractions.
Highlights
Due to the large population growth, the need to produce increasingly good quality milk and meat has challenged producer markets
Climate adversities have making forage resources scarce in most parts of Brazil, which may be a major cause of low performance indices of livestock in our country, forcing ranchers to seek alternatives associated with the use of breakthrough technologies
Sorghum may have phenolic compounds resulting from the secondary metabolism, including phenolic acids, flavonoids and tannins
Summary
Due to the large population growth, the need to produce increasingly good quality milk and meat has challenged producer markets. Among the alternatives foundin Brazil, the sorghum plant stands out by a set of factors, such as its high production potential; good adaptation to mechanization, great versatility Despite such advantages, sorghum may have phenolic compounds resulting from the secondary metabolism, including phenolic acids, flavonoids and tannins. This study aimed to evaluate in situ degradability and the degradation kinetics of dry matter, crude protein, neutral detergent fiber and acid detergent fiber of silages of four sorghum genotypes with and without condensed tannin in the grains
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