Produtos da fermentação in vitro de dietas com diferentes proporções de farelo de coco e níveis lipídicos

Abstract

This study aimed toevaluate the chemical composition, in vitro digestibility, fermentation kineticsandCH4 production of ruminant diets contain in different proportions of coconut meal in replacement of soybean meal. Three inclusion levels (10, 20 and 30%) of coconut meal were used with two different lipid levels: coconut meal with high fat (CMHF) and coconut meal with low fat (CMLF). Were analyzed the percentages of dry matter (DM), mineral matter (MM), ether extract (EE), crude protein (CP), neutral detergent fiber(NDF) and estimated the in vitro digestibility of organic matter, energy value, the total carbohydrates(TCH) and non-fiber carbohydrates (NFC).The ruminal kinetics was estimated by the in vitro gas production technique. The pH, NH3, CH4 and CO2 were analyzed with 24 hours of incubation. A factorial arrangement 3x2+1(3 proportions of coconut meal, 2 lipid levels and a control diet) with 7replications was utilized. The model FRANCE was used to estimate the kinetics of the fermentation and Tukey's test and F-Snedecor means for comparing the parameters of the gas production. The addition of coconut meal increased the EE and reduced the CP and NFC of the diets, especially when CMHF were used. There was a reduction in gas production with the inclusion of coconut meal to the diet. The maximum gas production potential was reduced with the inclusion of 20 and 30% of CMHF. The maximum gas production potential was reduced with the inclusion of 20 and 30% of CMHF. The addition of coconut meal reduced the digestibility, with the largest decreases with the addition of 30% CMHF. The inclusion of coconut meal did not affect significantly the production of methane and CO2. Ammonia and pH had significant difference with the inclusion of coconut meal, but the values fell within therangelim its recommended by the literature. It is concluded that coconut meal modify rumen fermentation, but CMLF does not changegas production, methane andCO2. The inclusion of 20% of CMLF reduces the concentration of ammonia, while 30% reduces the pH.