Características física e química dos perfilhos vegetativos e reprodutivos dos capins Braúna, Cayana e Sabiá diferidos

Abstract

Little is known about the nutritional composition of Braúna, Cayana and Sabiá forages recently launched on the market under deferred conditions, as well as whether there is a correlation between the chemical and physical characteristics of these forages. In this sense, the objective was to evaluate the chemical and physical composition in the reproductive and vegetative tillers of deferred Braúna, Cayana and Sabiá grasses, in addition to verifying if there is a correlation between chemical­bromatological characteristics and resistance to grinding. The work was carried out at the Experimental Farm Capim­branco and Laboratory of Bromatology and Animal Nutrition (LABAN) from April 2022 to December 2022. Sample collections were carried out in 12 plots of Brachiaria brizantha cv. Braúna (Braúna grass) and two more Brachiaria hybrids, currently available on the market (Cayana and Sabiá grasses). After the deferral period, two forage samples were collected, one of them weighed, placed in a forced ventilation oven for 72 hours and weighed again. While the other sample was separated into live leaf blade, dead leaf blade, live stem and dead stem that were also dried and weighed. Vegetative and reproductive tillers were collected at the end of deferment. The variables measured in the vegetative and reproductive tillers were resistance to grinding, dry matter (DM), mineral matter (MM), crude protein (CP), neutral detergent fiber (NDF), acid detergent fiber (ADF), lignin, in vitro dry matter digestibility (IVDMD) and determination of indigestible neutral detergent fiber (iNDF). It is concluded that the vegetative tillers have better nutritional value than the reproductive tillers, as they have better digestible fiber. There is no resistance between the grinding resistance and the chemical characteristics of deferred Braúna, Cayana and Sabiá grasses. The vegetative and reproductive tillers of Sabiá grass differ in having a better nutritional value than those of Braúna grass, with Cayana grass having a nutritional value similar to other grasses.