Resumen

RODRIGUEZ, Carlos E  y  GOMEZ, Diego F. Effect of supplementation with different doses of protected fat on growth performance and compositional bovine milk. Zootecnia Trop. [online]. 2013, vol.31, n.4, pp.299-310. ISSN 0798-7269.

The aim of this study was to evaluate the effect of supplementation with 200g (T2) and 400g (T3) of bypass fat compared to a control group (T1) on performance (liters) and compositional (fat, protein, solids-not-fat, total solids) of bovine milk, we worked with 12 Holstein cows between 2 and 4 births in her second lactation third of which were distributed into 3 groups of 4 units, using a completely randomized design. Supplementation time was 60 days under rotational grazing kikuyu with addition of 1.5kg of concentrate cow / milking protected fat addition (T2 and T3) carrying 10 samples comprehensive subjecting the milk analyzer previously calibrated Lactoscan® and compared to methods standardized, to record such data in Excel tables and applying an ANOVA with SPSS and comparison test of Tukey. The results reveal an increase in the production of 0.7L, 4.5L and 5.8L for the control group (T1), 200g/grasa (T2) and 400g/grasa (T3) P≤ 0.01 respectively, for the body fat percentage remained a value of 2.1% (T1), 2.3% (T3) and 2.81% (T2) which showed the most satisfactory result with an increase of 1.08% fat. For protein depletion was found T2 (-0.2%) and T3 (-0.52%) at a constant value for T1 (3.1%) in non-fat solids is obtained a value of 7.86% (T1), 7.7% (T2) and 7.41% (T3) P≤ 0.01, for total solids values of 10.04% (T1), 10.59% (T2) and 9.79 (T3).

Palabras clave : quality; bypass fat; milk.

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