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摘要
Objetivou-se avaliar a produ o animal de novilhos e vegetal de campo natural e de campo natural sobre-semeado com azev谷m (Lolium multiflorum), trevo branco (Trifolium repens) e cornich o (Lotus corniculatus) com e sem a utiliza o do herbicida glyphosate. Os tratamentos foram: CN 每 campo nativo, com ro ada anual; CNI 每 campo nativo com sobre-semeadura, aduba o e ro ada anual; G1 每 Idem ao CNI com aplica o de herbicida no primeiro ano; G3 每 idem ao G1 com supress o da vegeta o natural com herbicida no segundo e terceiro ano; GA3 每 Idem ao G3 com aduba o duplicada nos tr那s anos. O delineamento experimental foi blocos completamente casualizados com duas repeti es. Os resultados apresentados s o do terceiro anode avalia o. Para ganho m谷dio di芍rio, houve diferen as (p ㏒ 0,1) entre tratamentos e per赤odos, que variaram de 0,214 kg animal-1 dia-1 em CN a 1,406 para os tratamentos com introdu o de esp谷cies. Quanto 角 vari芍vel ganho por 芍rea, os ganhos variaram de 84 a 410 kg PV ha-1. As cargas variaram de 283 a 679 kg PV ha-1. O uso do herbicida n o apresentou efeitos sobre a produ o; e a introdu o de esp谷cies de esta o fria por sobre-semeadura melhorou a produ o animal emCN, que possibilitou a colheita de maiores ganhos animal-1 dia-1 e por 芍rea. This study evaluated animal production of steers and pasture production of natural grassland and grassland overseeded withItalian ryegrass (Lolium multiflorum), white clover (Trifolium repens) and birdsfoot trefoil (Lotus corniculatus), with and without the use of glyphosate herbicide. Treatments consisted of: NG 每natural grassland, with annual mowing; ING 每 natural grassland with overseeding, fertilizing and annual mowing; G1 每 Same ING, but with glyphosate application in the first year; G3 每 same as G1, with suppression of natural vegetation using herbicide in the second and third years; GF3 每 same as G3, with doubled fertilizing in the three years. The experimental design consisted of completely randomized blocks with two replications. The results presented are from the third year of evaluation. For average daily weight gain, there were differences (p ㏒ 0.1) among treatments and periods, varying from 0.214 kg animal-1 day-1 in NG to 1.406 for the treatments with introduction of species. Live weight gain per area varied from 84 to 410 kg of LW ha-1. The stocking rates varied from 283 to 679 kg of LW ha-1. The herbicide did not present effects on production; andintroduction of cool season species by overseeding improved animal production in NG, resulting in higher animal performance per animal and per area.
