Banca de DEFESA: ALETHEIA ROTTA PADILHA

Uma banca de DEFESA de MESTRADO foi cadastrada pelo programa.
STUDENT : ALETHEIA ROTTA PADILHA
DATE: 08/12/2023
TIME: 09:00
LOCAL: Web Conferência - Google Meet: https://meet.google.com/yco-xsxc-rjm.
TITLE:

Influence of fertile eggshell quality on production parameters in the hatchery, in the chicken and in the intestinal microbiota of day-old chicks.

KEY WORDS:

Thin shell; heavy dies; sequencing; bed eggs; outbreak.

PAGES: 45
BIG AREA: Ciências Agrárias
AREA: Medicina Veterinária
SUMMARY:

There are countless and constant challenges in the fertile egg production segment. To leverage results, it is therefore necessary to analyze the performance of the hatchery and the chicken in the field, as well as the analysis of the composition of the intestinal microbiota of day-old chicks. , in order to direct better decisions. The objective of the study was to evaluate the influence of fertile eggshell quality on production parameters in the hatchery, in the chicken and on the intestinal microbiota of day-old chicks. Two experiments were carried out, with 5,848 eggs used for experiment I, from two heavy breeder farms, one positive (V1) and the other negative (C1) for Infectious Bronchitis in Chickens (BIG), divided into 4 treatments: T1 - eggs normal shell C1; T2 - C1 thin shell eggs; T3 - normal shell eggs V1 and T4 - thin shell eggs V1. In the hatchery, zootechnical indexes were evaluated and then 1,742 chicks were housed, 448 chicks/treatment, divided into 8 replications.Zootechnical data from the hatchery, unhatched embryos, embryodiagnosis and performance of chickens from 1 to 42 days of age were analyzed.For experiment II, 13,760 eggs were used, coming from a heavy breeder farm, divided into 4 treatments: T1 - normal nest shell eggs; T2 - normal shell eggs; T3 - thin shell nest eggs; T4 - thin-shelled eggs. The hatched chicks were evaluated at two different times, at birth and shipping, divided into 10 replications, to evaluate the composition of the microbiota. Data from experiment I were subjected to analysis by Shapiro Wilk andTukey test at 5% probability. Data from experiment II were subjected to two-way ANOVA analysis. In experiment INormal shell eggs showed higher hatchability and hatchability rates, lower percentage of discarded chicks, lower initial and intermediate mortality, bacterial and fungal contaminations (P<0.05). Eggs from BIG-positive breeders showed reduced hatching and hatchability rates (P<0.05) and higher percentages of discarded chicks, bacterial and fungal contamination, as well as final mortality (P<0.05). Chicks from T4 had a higher average weight on day one (P<0.05) and a better CA at 42 days of age (P<0.05). Mortality was higher in chickens from positive breeders during the growth phase (P<0.05), but shell thickness had no influence (P>0.05).In the results of experiment II, it was observed that thin-shelled eggs showed intermediate and final embryonic mortality and dead pecked eggs were higher than normal-shelled eggs (P>0.05). Bed eggs were better in terms of hatchability, hatchability, infertile eggs, initial, intermediate and final mortality, as well as in bacterial contamination than nest eggs (P<0.05). Among thin-shelled eggs collected from litter, the parameters of discarded chicks, initial, intermediate and final mortality, bacterial and fungal contamination, live and dead pecking were worse in relation to thin-shelled eggs (P<0.05). For the evaluation of the microbiota composition, no difference was observed regardless of the treatment. It is concluded that the thickness of the eggshell, the presence of BIG and the location of the egg laying impact on the zootechnical indicators of incubation and chicken performance, without impacting the composition of the chicks' intestinal microbiota.

COMMITTEE MEMBERS:
Externo à Instituição - RICARDO MITSUO HAYASHI
Presidente - 2277465 - FABIANA MOREIRA
Externo à Instituição - RICARDO HUMMES RAUBER