Evaluation of two levels of probiotic (Bacillus subtilis) in feed tilapia (Oreochromis niloticus) Initial phase.

Abstract

The research was conducted in the Chinampas Training Center, located on the  Carretera  de  Oro  km  14  1/2,  Canton  Camping,  Ciudad  Delgado,  San  Salvador;  It  lasted  63  days,  beginning  in  November  2015  with  fingerling  14 days old and ended in January 2016 taking 70 days of life; this was to evaluate  the  use  of  two  levels  of  probiotic  1%  and  2%,  added  in  the  food  tilapias in the juvenile stage. 540 fingerlings were used the Tilapia technique Genetically Maleweights between 3-5 g. Statistical methodology used was a  completely  randomized  design  with  significance  level  of  5%,  divided  into  three  treatments  with  180  fry;  orthogonal  contrasts  test  was  applied  to  compare  which  study  treatment  produced  the  best  results.  The  study  treatments were: T0 concentrate with 38% protein, T1: protein concentrate with  38%  and  +  1%  probiotic  T2:  protein  concentrate  with  38%  +  2%  probiotic. The variables evaluated were: weight, height, feed conversion and mortality rates. In making the variable weight data showed significance (p <0.05) to give a final weight of 45.3 g, 75.3 g and 55 g; Variable size not show significance (p> 0.05) to give 15.0 cm, 18.0 cm and 16 cm; variable feed conversion showed significance (p <0.05) to give 1.05, 0.95 and 1, and the  percent  mortality  rate  was  8.33%,  6.66%  and  7.22%.    The  study  was  conducted in order to compare the effect of probiotic feeding juveniles (pre-fattening), to achieve in a shorter time established weights, thereby reducing feed costs.