Palma forrageira (Opuntia ficus indica Mill) associada a diferentes volumosos em dietas para vacas da ra a Holandesa em lacta o = Addition of spineless cactus (Opuntia ficus indica Mill) to different types of roughage in the diet of lactating Holstein cows

Objetivou-se avaliar o efeito da associa o da palma forrageira com diferentes volumosos sobre o consumo, produ o de leite e digestibilidade aparente de vacas em lacta o com peso médio de 560 ± 50 kg e produ o de 20 kg dia-1. Os tratamentos foram os diferentesvolumosos: baga o de cana-de-a úcar (BC), feno de capim-tifton, feno de capim elefante, silagem de sorgo e mistura de baga o de cana + silagem de sorgo. Foram avaliados os consumos de matéria seca (MS), proteína bruta (PB), extrato etéreo (EE), fibra em detergente neutro(FDN), carboidratos n o-fibrosos (CNF), carboidratos totais (CHT), matéria organica (MO) e nutrientes digestíveis totais (NDT); os coeficientes de digestibilidade aparente de MS, PB, EE, FDN, CNF, CHT, MO e a produ o e teor de gordura do leite. Os volumoso associados à palma forrageira n o influenciaram o consumo e digestibilidade da maioria dos nutrientes, n o influenciando também a produ o de leite, a produ o de leite corrigido para 3,5% de gordura e o teor de gordura do leite, com médias de 16,92 kg dia-1, 17,57 kg dia-1 e 3,76%, respectivamente. A palma forrageira pode ser associada a diferentes volumosos em dietas para vacas em lacta o, sem alterar o consumo, o desempenho e a digestibilidade da matéria seca e dos nutrientes. The experiment was carried out to evaluate the association of spineless cactus with different roughage sources on the apparentdigestibility, intake and milk yield of lactating cows (average 560 ± 50 kg LW and 20 kg of daily milk yield). The treatments contained different roughage sources with spineless cactus: sugar cane bagasse, tifton hay, elephant grass hay, sorghum silage and a mixture of sugar cane bagasse + sorghum silage. The voluntary intake of dry matter (DM), crude protein (CP), ether extract (EE), neutral detergent fiber (NDF), non-fiber carbohydrates (NFC), total carbohydrates (TCH), organic matter (OM) and total digestible nutrients (TDN) was evaluated. In addition, the apparent digestibility coefficient for DM, CP, EE, NDF, NFC, TCH, OM, milk production, and milk fat concentration of lactating Holstein cows were also evaluated. The different types of roughage in association with the spineless cactus did not affect the digestibility coeficients and the intake of most nutrients. The roughage sources also did not affect milk production, fat-corrected milk production and milk fat concentration, with averages of 16.92 kg day-1, 17.57 kg day-1 and 3.76%, respectively. The spineless cactus could be added to different roughage sources in diets for lactating cows without altering the intake, per