Fractionation of carbohydrates and protein and rumen degradation kinetic parameters of brachiaria grass silage enriched with rice bran

Abstract

This experiment was conducted to evaluate the protein and carbohydrate fractions, and to estimate the in situ rumen degradation kinetic parameters of Brachiaria decumbens grass silage with inclusion of rice bran. Five rice bran inclusion levels were tested: 0, 10, 20, 30 and 40% of the natural matter, distributed into a completely randomized design with five replications. The brachiaria grass was obtained at 60 days of regrowth by cutting the forage at 10 cm from the soil and ensiling it in 10-L experimental silo bags, which were opened after 40 days. The degradability profiles for DM, CP, NDF and of the feeds for each animal utilized made it possible to obtain the estimates of the parameters analyzed. The contents of total carbohydrates (TCH), fibrous carbohydrates and fraction A+B 1 of the TCH decreased linearly as the rice bran levels were elevated. Fraction A of the protein was increased linearly by 0.64% for every 1% of rice bran added to the silage. For nitrogenous fractions B 3 and C, there was a decrease of 0.11 and 0.40% for each 1% of rice bran added to the silage, respectively. For the rumen degradability parameters of the dry matter, fractions A and I had estimated increases of 0.54 and 0.04% for every 1% inclusion of rice bran. For the degradation rate of fraction B (c), treatments had no effect. Fractions A and I of the crude protein degradability parameters increased by 0.22 and 0.72%, respectively, with inclusion of 1% rice bran. Inclusion levels of rice bran had no effect on fraction D, on the degradation rate of fraction B (c) or lag time (L) estimated for neutral detergent fiber. Inclusion of 10 and 20% rice bran in the brachiaria grass silage improves protein and carbohydrate fractions and rumen degradation kinetic parameters of dry matter, crude protein and neutral detergent fiber.

Effect of cutting time on agronomic and nutritional characteristics of nine commercial cultivars of Brachiaria grass compared with Napier grass during establishment under semi-arid conditions in Rwanda

“…The high rate of degradation might be influenced by the high energy content of these grasses. Negrão et al (2014) reported that the increase of rate of degradation in cv. Basilisk was influenced by increasing levels of rice bran as source of energy.…”

“…Furthermore, although Napier grass had reasonable degradable fractions, it required a longer time (26 h) to be degraded than the other grasses. This means that at this growth age the DM intake of Napier grass by a ruminant livestock might be reduced due to the extended length of time taken in the rumen (Negrão et al, 2014).…”

Kinetic Parameters of Ruminal Degradation of Marandu Grass Silage Supplemented With Brewer´s Grain

“…These factors inhibit the occurrence of an adequate fermentative process and hamper the production of high quality silage. To reduce these losses, numerous experiments have been carried out and need to be validated for effectiveness (Zanine et al, 2006a;Zanine et al, 2006b;Negrão et al, 2014). …”

“…The characterization of the fractions that constitute carbohydrates of food obtained in tropical conditions and the evaluation of its degradation kinetics pattern are valuable tools in diet formulation because they aim to maximize ruminal microbial growth and consequently result in a better prediction of animal performance (Dantas et al, 2014;Negrão et al, 2014).…”

Таксономические И Функциональные Особенности Микробиоты Рубца У Дойных Коров С Диагнозом Кетоз

“…Важно, что энергетический метаболизм жвачных отличается от такового у моногастрических животных: энергия поступает в основном за счет микробного брожения в рубце (12). У здоровых животных под действием ферментов микроорганизмов целлюлоза, которой богаты корма жвачных, гидролизуется в рубце до целлобиозы, затем до глюкозы и далее до лактата (13,14). Наконец, в результате ряда ферментативных реакций, осуществляемых преимущественно бактериями порядка Selenomonadales, из лактата образуются летучие жирные кислоты (ЛЖК) (15).…”