Banca de DEFESA: DANIELA PINHEIRO DE OLIVEIRA

Uma banca de DEFESA de MESTRADO foi cadastrada pelo programa.
STUDENT : DANIELA PINHEIRO DE OLIVEIRA
DATE: 21/02/2022
TIME: 08:00
LOCAL: ON-LINE
TITLE:

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KEY WORDS:

prebiotics, probiotics, antibiotics, laying birds.

PAGES: 58
BIG AREA: Ciências Agrárias
AREA: Zootecnia
SUMMARY:

This study aimed to evaluate the effect of the use of symbiotic supplements Saccharomyces cerevisiae, Bifidobacterium bifidum, Bacillus subtilis, Enterococcus faecium, Lactobacillus acidophilus, Glucans and Mannans in the diet of laying hens in the post-peak period. There were 19 pullets of the Dekalb White strain, with 70 weeks of age, up to 90 weeks of age, distributed in DIC with 6 treatments, 3 repetitions of 6 hens per cage, composing 33 birds per treatment. The treatments were composed of two base diets, the first one composed of corn and soybean meal (RR); another diet based on corn, soybean meal and meat and bone meal (FCO); and four more test diets formulated with FCO, being a diet with the addition of 0.05% of the zinc bacitracin additive (FCO+Bac Zn) provided from the initial, rearing and laying phases, respectively. The variables evaluated were: birds’ performance (feed consumption, egg production, egg weight, egg mass and feed conversion), egg quality (eggoscopy, egg weight (g), yolk color, albumen height (mm), albumen weight (g), yolk weight (g), shell weight (g), shell thickness (mm) and percentages of yolk, albumen, shell and Haugh Unit) and nutrient metabolizability
coefficients (EMA, EMAn, CMAEB, CMAPB and CMAMS). The data were analyzed, and the means were compared by Orthogonal Contrast (P<0.05). The contrasts were C1: RR vs FCO; C2: FCO vs BacZn; C3: BacZn vs Simb-C; C4: BacZn vs Simb-R and C5: BacZn vs Simb-P. For performance variables there was no significant effect (P>0.05). For egg quality, candling and yolk color variables, there was a significant effect (P<0.05) for C1, yolk color for C2, yolk weight for C3 and percentage of C1 albumen. For the digestibility, the CMAEB variable showed a significant difference in the C1 and C4 contrasts. For the CMAPB variable, there was a difference in the C1 and C2 contrasts. As in the variable CMAMS, there was a significant difference in the contrasts C1, C2, C3 and C4. For the other parameters there was no significant effect (P>0.05). Thus, it is possible to replace the antibiotic by the symbiotic, promoting similar results in performance, egg quality and nutrient digestibility when used in diets in the post-peak laying phase.

BANKING MEMBERS:
Presidente - 2211129 - CARLOS BOA VIAGEM RABELLO
Externo ao Programa - 3002458 - DANILO TEIXEIRA CAVALCANTE
Interna - 3209084 - LILIAN FRANCISCO ARANTES DE SOUZA