Óleos essenciais, ácidos orgânicos e probióticos associados ao antibiótico melhorador de desempenho em rações para frangos de corte

Abstract

The use of alternative feed additives such as organic acids, probiotics, and essential oils in the poultry industry has been increasing due to restrictions regarding the use of antibiotics as growth promoters. For that, four experimental trials were conducted to evaluated the use of feed additives in association with antibiotics. The first experiment had three treatments and 10 replicates, in which 660 one-day-old chicks (22 birds per pen) were distributed in a completely randomized design. The treatments were as follows; treatment 1: basal diet plus enramycin addition. Treatment 2: basal diet without feed additives addition. Treatment 3: basal diet plus enramycin and essential oil addition. The second experiment had the same experimental design of the first one; however, with the following treatments: treatment 1, basal diet plus enramycin addition; treatment 2, basal diet without feed additives addition; treatment 3: basal diet plus enramycin and organic acid addition. The third experiment also used the same experimental design; although with the following treatments: treatment 1, basal diet plus enramycin addition; treatment 2, basal diet without feed additives addition; treatment 3: basal diet plus enramycin and probiotic addition. The fourth experiment was conducted with a completely randomized design with two treatments and ten replicates (22 birds por replicate), totalizing 440 one-day-old chicks. The treatments were as follows, treatment 1: basal diet plus enramycin addition associated with essential oil and probiotic, Treatment 2: basal diet plus enramycin associated with organic acids and provbiotics. No statistical differences were observed among treatments for final average body weight, body weight gain, feed intake nor feed conversion (P>0.05). Neither were observed differences among treatments for carcass and commercial cuts yield (P>0.05), which were analyzed in two birds per experimental unit at 42 days of age.