T13.08 L846e.pdf - Universidad de La Salle

ABSTRACT
The present study was done in order to analyze the effect of efficient
microorganisms EM as a supplement in the feeding of dairy cows in the tropics.
This trial was made in two steps, first in laboratory the mini-silos and the
experimental phase. The mini-silos methodology was used to analyze the
compositional changes in the silage regarding crude protein, soluble protein, not
protein nitrogen NPN, acid detergent fiber ADF and neutral detergent fiber NDF.
For the experimental phase nine guzolando cows were used, under a semiintensive
grassing system with Cynodon nlemfluensis, and were divided randomly
in three treatments in which two basic things were analyzed in milk production:
volume and compositional quality. Each treatment arranged three repetitions which
had different ages and number of calvings. The treatments were: T1:
supplemented with commercial feed in pellet, T2: supplemented with corn silage
and T3: supplemented with corn silage + EM. The results were analyzed under a
random blocks design. Concerning milk production, the treatment that had the
highest value was the one supplemented with commercial feed in pellet (14.907
L/day), while over the other two treatments there weren’t significant differences,
with a production of 8.934 L/d the treatment with silage and 8.771 L/d the one with
silage + EM. Concerning the milk composition, protein was the value that less
varied according to the treatment and didn´t presented significant differences. Fat
was the component that varied the most, presenting significant differences, the
treatment with the higher value was the one with commercial feed with 3.549%,
followed by the one with silage 3.424%, and lowest was the one with silage and
EM with 3.251%. Regarding density which also presented significant differences,
the treatment with silage and EM was the one that produced the densest milk
(1034.083), followed by the one of silage (1032.880) and at last the one with
concentrated feed (1030.961). According to the number of calvings there weren’t
significant differences in any of the variables. This study lasted 30 days and was
done in the first 100 days of lactation of the cows. Concluding that even when
microorganisms seem to improve the compositional quality of the corn silage, they
don´t make any better milk production neither milk compositional quality.
Key words: corn silage, efficient microorganisms, micro silage.