Forage yield in pastures with bermuda grass mixed with different legumes/Producao de forragem em pastagens de capim bermuda consorciado com diferentes leguminosas

Three grazing systems with Coastcross-1 bermuda grass (CC) + 100 kg N [ha.sup.-1] [year.sup.-1] + common vetch; CC + 100 kg N [ha.sup.-1] [year.sup.-1] + arrowleaf clover; and CC + 200 kg N [ha.sup.-1] [year.sup.-1] were evaluated. Thirteen grazing cycles were performed during the experimental period (313 days), with two, five, four and two cycles respectively in winter, spring, summer and fall. Lactating Holstein cows were used in the evaluation. Daily accumulation rate, forage production, rate of forage disappearance, agronomic intake, grazing efficiency, herbage allowance and stocking rate were evaluated. Mean rates of forage yield and stocking rate were 20.8; 17.6 and 19.7 t DM [ha.sup.-1] and 7.0; 6.8 to 6.8 animal units [ha.sup.-1] [day.sup.-1] for the respective forage systems. The mixture Coastcross-1 plus common vetch, fertilized with 100 kg N [ha.sup.-1] [year.sup.-1] and Coastcross-1 fertilized with 200 kg N [ha.sup.-1] [year.sup.-1] provided greater productivity and better distribution of forage throughout the seasons. Keywords: Cynodon, lactating cows, stocking rate, Trifolium vesiculosum, Vicia sativa. Este trabalho foi realizado para avaliar tres sistemas forrageiros constituidos por capim bermuda, cv. Coastcross-1 (CC) + 100 kg N [ha.sup.-1] [an.sup.-1] + ervilhaca comum; CC + 100 kg N [ha.sup.-1] [an.sup.-1] + trevo vesiculoso e CC + 200 kg N [ha.sup.-1] [an.sup.-1]. Foram realizados 13 ciclos de pastejo durante o periodo experimental (313 dias), dois, cinco, quatro e dois ciclos, no inverno, primavera, verao e outono, respectivamente. Para avaliacao experimental foram utilizadas vacas em lactacao da raga Holandesa. Foram avaliados a taxa de acumulo diario, a producao de forragem, a taxa de desaparecimento, o consumo agronomico, a eficiencia de pastejo, a oferta de forragem e a taxa de lotacao. Os valores medios da producao de forragem e taxa de lotacao foram 20,8; 17,6 e 19,7 t MS [ha.sup.-1] e 7,0; 6,8 e 6,8 unidade animal [ha.sup.-1] [dia.sup.-1] para os respectivos sistemas de forrageiras. O consorcio constituido por Coastcross-1 + ervilhaca, adubado com 100 kg N [ha.sup.-1] [an.sup.-1] e a pastagem de Coastcross-1 adubada com 200 kg N [ha.sup.-1] [an.sup.-1] proporcionaram maior produtividade e melhor distribuicao da forragem ao longo das estacoes. Palavras-chave: Cynodon, vacas em lactacao, taxa de lotacao, Trifolium vesiculosum, Vicia sativa.