Banca de QUALIFICAÇÃO: JOAO MARCOS MARTINS RAMOS

Uma banca de QUALIFICAÇÃO de MESTRADO foi cadastrada pelo programa.
STUDENT : JOAO MARCOS MARTINS RAMOS
DATE: 22/12/2025
TIME: 08:00
LOCAL: meet.google.com/hmc-yngn-don
TITLE:

Effect of including two Bacillus Spp. species in the diet of Broiler 

KEY WORDS:

Carcass evaluation, bacillus, zootechnical performance, broilers, probiotics

PAGES: 32
BIG AREA: Ciências Agrárias
AREA: Zootecnia
SUBÁREA: Nutrição e Alimentação Animal
SPECIALTY: Avaliação de Alimentos para Animais
SUMMARY:

The objective was to evaluate the probiotic potential of two Bacillus spp. strains, used individually or in combination, for broilers, and their effects on performance, carcass yield, organ morphometry, litter ammonia production, and footpad integrity. A total of 288 one-day-old male Cobb 500 chicks, with an average initial weight of 47 g, were used. The treatments consisted of a reference diet without probiotics or any growth promoter; a diet containing Bacillus XXXXX (500 mg/kg); a diet containing Bacillus XXXXXX (500 mg/kg); and a diet containing the combination of B. XXXXXX and B. XXXXXX (500 mg/kg). The experiment lasted 35 days. Data were subjected to analysis of variance and Tukey’s test at a 5% significance level. A significant effect on performance was observed from 1 to 21 days, when the combination of the bacilli increased body weight and weight gain. Feed intake was higher with B. XXXXXX and with the mixture of the bacilli during the initial phases; at 28 days, only the combination increased feed intake, without affecting weight gain or feed conversion. No significant differences were observed among treatments for viability, mortality, or productive efficiency index (PEI). At 25 days of age, the control group showed a higher litter pH (7.80), whereas the groups receiving B. XXXXXXX and the mixture of bacilli had reduced pH. At 35 days, B. XXXXXXX resulted in the lowest ammonia production. No significant differences were found for right or left leg deviations or for gait score. The inclusion of probiotics in the diets did not alter organ morphometry or carcass and commercial cut yields, except for the thigh, which showed lower yield in broilers fed the mixture of bacilli. It is concluded that B. XXXXX and B. XXXXXX were effective as probiotics in broiler diets, contributing to improved productive performance. Additionally, they influenced the reduction of ammonia volatilization potential, depending on the strain used.

COMMITTEE MEMBERS:
Interna - 1408673 - CLÁUDIA DA COSTA LOPES
Externa à Instituição - ANDREZA LOURENÇO MARINHO
Externa à Instituição - RITA BRITO VIEIRA - UNESP