Produção e valor nutritivo de capim - marandu e desempenho de bovinos de corte em sistemas integrados de produção agropecuária

Abstract

Intensification of production systems, mainly through the integration of crop, livestock and forest, can result in greater productive potential. Our objective was to compare the yield and nutritive value of marandu grass (B. brizantha cv. Marandu) and performance of Nelore steers (Bos taurus indicus) in integrated systems of agricultural production in the Amazon Biome. The experiment was conducted in Sinop, MT, from July 17, 2017 to May 24, 2018, in a randomized complete block design with four replicates. The treatments consisted of three systems of production (livestock, forest-livestock and crop-livestock) in two seasons of the year defined by the rainfall regime (dry and rainy). The steers with mean initial weight of 338 ± 10 kg PC were managed under continuous stocking and variable stocking rate. The higher agronomic performance and better qualitative indicators were observed in the crop-livestock system and in the rainy season. As a consequence, the results in animal production were also higher in the crop-livestock system, with a gain in weight per area of 860 kg PC ha-1

, although the livestock and livestock-forest system presented animal performance above the national average, with gain by weight per area on average of 750 kg PC ha-1

. Therefore, we conclude that the crop-livestock integration system presents great potential of forage production of high nutritional value and animal performance, being able to be an alternative for the intensification of farming systems in the Amazon Biome. Livestock animal production systems, with adequate management of grazing and maintenance of soil fertility associated with nutritional supplementation, make it possible to increase forage and animal production, ensuring the sustainability of the system.