Probiotic as alternative to antibiotic for broiler chicken fed food industrial residual oil

الملخص EN

This study aimed to evaluate the effect of probiotic (some lactic acid bacteria) with different levels of food industrial residual oil in broiler commercial diets on growth performance, meat yield, internal organs, economical efficiency and performance index.

One hundred and e ighty one day old Cobb chicks (45 ± 0.4 g) were equally and randomly divided into 6 groups namely; the antibiotic with fresh oil (FO),the antibiotic with mixed oil (MO) [FO+RO ( 1:1 w/w)], the antibiotic with food industrial residual oil (RO), the probiotic with FO, the probiotic with MO and the probiotic with RO.

Virginiamycin, Phibro, USA (15 ppm), was the antibiotic, while a mixture of lactic acid bacteria is chosen as probiotic.

Both were added to the water.

During the experiment which lasted for 42 days, the body weight, the feed intake and the mortality rate were recorded at 2, 4 and 6 weeks of age then the body weight gain, feed conversion ratio, economical efficiency and performance index were calculated.

The results revealed that the average body weight, body weight gain and feed consumption significantly (P<0.05) increased in groups of chick fed probiotic with different levels of RO compared with the groups of chicks fed with the antibiotic at the same levels of RO.

The rate of the decrease of the average feed conversion ratio differed according to the broiler age.

The highest decrease level (best) was shown during the period from 4 to 6 weeks of birds age in the group which fed probiotic with FO and MO compared with other groups.

The mortality rate decreases significantly (P<0.05) in the groups of chicks were fed probiotic with FO, MO and chicks fed antibiotic with FO without significant difference in the whole periods.

The breast, thigh, heart and spleen weight corresponding to the different treatments did not differ significantly (P>0.05) while liver increased significantly (P<0.05) in probiotic FO and gizzard in all probiotic group and antibiotic MO.

The highest performance index was observed in groups of birds treated with probiotic with MO followed by birds treated with probiotic FO without significant difference.

It could be concluded that supplementation of probiotic in broiler diet containing different levels of RO was economically more beneficial than antibiotic.