| Sumario: | The effect of supplement a low quality pasture with the supply of legumes mixtures with and without tannins on the milk production and quality was evaluated. The experiment was carried out at CIAT Experimental Station, Cauca, Colombia. Eight Holstein x Cebu, cows distribuited were in four treatments in a balanced overchange design with two animals for sequences were used. The treatments were: T1: Calliandra calothyrsus 100%, T2: Vigna unguiculata 100%, T3: Vigna unguiculata/Calliandra calothyrsus 67/33% and T4: Calliandra calothyrsus/Vigna unguiculata 67/33%. The hay supplement was the milking moment was presented. The cows consumed Paspalum notatum in dry period in a 7/7 alternate grazing system during 56 days. The daily milk production and milk ureic nitrogen (NUL) was measured. The great consume of dry matter was Vigna 100% and her mixture, while with Calliandra 100% depressed consume. The fat by correct milk production was great in Vigna than Calliandra, although was not differences in the mixtures. The quality milk don't change between treatments for fat, totals solid and non fat solids. The NUL presented significant difference (P<0.05) due to treatments, so the more high for T2 than for T1.Vigna produced 1.5 litters more milk than Calliandra and than the inclusion of this tanniniferous legume depress the milk production, but the 33% and 67% levels can utilize without impair in the production.
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