<b> <i>In situ</i> degradability of dry matter and fibrous fraction of sorghum silage

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 CMS-XS 165 without tannin was superior. Silages of genotypes BR 700 and CMS-XS 114 with tannin showed the highest values of indigestible ADF (59.54 and 43.09%). Regarding the NDF, the potential degradation of silage of CMS-XS165 line without tannin was superior. Tannin can reduce ruminal degradability of the dry matter and fibrous fractions.Degrabilidade in situ da matéria seca e fração fibrosa da silagem de sorgo RESUMO. Objetivou-se avaliar a degradabilidade in situ e a cinética de degradação da MS, FDN e FDA das silagens, com presença e ausência de tanino nos grãos. Foram utilizadas, duas linhagens isogênicas de sorgo granífero (CMS-XS 114 com tanino e CMS-XS 165 sem tanino) e dois híbridos de sorgo (BR-700 duplo propósito com tanino e BR-601 forrageiro sem tanino). Amostras de silagens secas e moídas foram colocadas em sacos de náilon e introduzidas nas fístulas dos bovinos. Após períodos de incubação de 6, 12, 24, 48, 72 e 96 h, os sacos foram removidos para análises posteriores das frações fibrosas. O delineamento experimental utilizado foi o inteiramente casualizado, com quatro repetições e quatro tratamentos e as médias comparadas pelo teste de Tukey em nível de 5% de significância. Quanto à taxa de degradação da MS, a silagem da linhagem CM-SXS 165 sem tanino foi superior. As silagens dos genótipos BR 700 e CMS-XS 114 com tanino apresentaram os maiores valores de fração indigestível da fração FDA (59,54 e 43,09%). Para a FDN, observou-se que o potencial de degradação da silagem da linhagem CMS-XS 165 sem tanino foi superior. A presença do tanino pode reduzir a degradabilidade ruminal, da matéria seca e das frações fibrosas.Palavras-chave: alimento conservado, forragem, tanino, valor nutricional.License information: This is an open-access article distributed under the terms of the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. Ŷ =35.8463 (1-e 0.04*t ); R 2 = 0.9970 Ŷ = 71.5607 (1-e 0.01*t ); R 2 = 0.9780 Ŷ = 50.0286 (1-e 0.02*t ); R 2 = 0.9750 Ŷ = 59.4826 (1-e 0.02*t ); R 2 = 0.9940

Nutritional potentialities of sweet sorghum plant parts in ruminant production system

“…This is an indication of lower energy loss to ruminants. Methane gas produced were within range of values (4.28 -6.02ml) reported by Costa et al (2016) for sorghum silage but lower to values obtained (10.87 -11.93ml) reported by Ardiansynah et al (2016) for sorghum silage. The variation might be attributed to the different species, soil composition on which it is grown, stage and time of harvest which are capable of altering the nutritive compositions and presence of high anti-nutritional factors like tannin.…”

Silage quality of six sorghum cultivars for sheep

“…Considering the adaptation traits of these cultivars to soil and climatic conditions of semiarid regions, and the productive potential previously reported in other studies (Santos et al, 2013;Neves et al, 2014Neves et al, , 2015Costa et al, 2016), the evaluation of their nutritional value is indispensable. In the same way as the evaluation of forage at a field scale and of the agronomic traits are important, the forage nutritional value and the animal digestive behavior are essential for a complete analysis of a potential new cultivar.…”

Chemical composition and rumen degradability of byproducts available in the Amazon region

“…By contrast, the palm fiber, macaúba pulp cake and acai fruit reached the maximum DM degradation point at 96 hours of incubation, with only 21.1, 38.7 and 21.3% effective degradation, respectively, considering a slow rate of passage (2%/hour) ( Table 2). Given the negative correlation of DM degradability with lignin content and NDFi as well as the observation that lignin is the factor with the greatest effect on the extent and rate of DM degradation (COSTA et al, 2016), the above DM degradation results can be attributed to the lignin and NDFi levels in the byproducts. The palm fiber and macaúba pulp cake byproducts had the highest observed lignin contents (Table 1), providing a barrier that restricted the activity of the digestive enzymes produced by the ruminal microorganisms and thus leading to low degradability.…”