Abstract
The objective of the present study was to evaluate the effect of addition of propolis based products (LLOSA2 and LLOSC1) at two concentrations of propolis (A and C) and two alcoholic contents (1 and 2,) towards the use of lasalocid sodium (positive control) in total tract digestibility and performance of Holstein heifers fed from birth to weaning (60 days) with milk and concentrate diet (20% crude protein). It was used a completely randomized design with three treatments and ten repetitions for performance evaluation, and four replications to estimate the total tract digestibility of the diets at 5% significance level. There was no effect (P>0.05) of the tested additives on dry matter intake of heifers (1048.5 g/day), average daily weight gain (711.3 g/day) and feed conversion (1.5). Similarly, no significant difference (P>0.05) of additives was observed on the digestibility of dry matter (77.4%), crude protein (79.0%) and ether extract (96.9%). Thus, data suggest that the additives based on propolis can be used in replacement of lasalocid in Holstein heifers, as the additives based on propolis did not cause any damage to the nutrient intake, performance, feed conversion and total tract digestibility of tested diets.
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