Resumen

HERRERA, Ana María et al. Hay intake and milk production in dual purpose cows suplemented with multinutritional blocks. Zootecnia Trop. [online]. 2009, vol.27, n.4, pp.465-473. ISSN 0798-7269.

To evaluate the effect of the supplementation with multinutritional blocks (MB) on milk production, 20 dual purpose cows were used with breeding and 1 or 2 calving, in hilly area of the central plains of Venezuela. The experiment was carried with duration of 60 days of supplementation and 30 additional days of evaluation. A completely randomized design was used, with two groups: Control group (CG) (n=10): animals with ad libitum basal diet and Experimental group (EG) (n=10): animals with diet basal ad libitum plus MB. Sold milk and consumed by the calf were measured, and used to estimate total milk. As basal diet these animals were in paddocks with species like Cynodon nlemfuensis, Panicum maximun, Andropogon gayanus, Brachiaria arrecta and Dichanthium aristatum, and consumed milled hay of Cynodon nlemfuensis and crop residues of Sorghum bicolor in corrals. The chemical composition of the MB was: 29,6% of crude protein, 2,1% of ethereal extract, 16,9% of DNF, 9,9% of calcium and 2,5% of phosphorus. The average of MB intake was 67,92± 21,41 g.100 kg^-1 live weight. The effect of treatment was significant in the milk consumed by the calf (P<0,01), with EG= 1,17 ± 0,34 and CG= 0,75 ± 0,36 kg; sold and total milk did not show significant differences between treatments (P>0,05). A tendency exists to the increase in the milk production in supplemented cows with multinutritional blocks in these conditions, evidenced in the consumption of milk by the calf

Palabras clave : dual purpose cows; multinutritional blocks; milk production.

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