Banca de DEFESA: ANDRÉ LUIZ DELLA VOLPE

Uma banca de DEFESA de MESTRADO foi cadastrada pelo programa.
STUDENT : ANDRÉ LUIZ DELLA VOLPE
DATE: 03/08/2022
TIME: 15:30
LOCAL: Web Conferência - Google Meet.
TITLE:

Effect of fertile egg storage time, laying age and broiler breeder line on hatchability and first-week performance of broiler chicks.

KEY WORDS:

Hatching; incubation; weight; chicks; viability.

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

Proper management of fertile eggs and mitigation of the impacts of production seasonality are extremely important in poultry. Therefore, the objective of this study was to evaluate the effects of fertile egg storage time, broiler breeder lines and laying ages on hatchability rates, mortalities and first week weights of broiler chicks. There were 12 treatments, in a factorial arrangement with two breeder lines (Cobb MV and Ross 95) at two laying ages (30 and 40 weeks and between 50 and 60 weeks) and three different fertile egg storage periods (4, 7 and 9 days). The eggs were incubated in a multi-stage hatchery and at hatching, the male chicks were housed in an experimental farm with 96 boxes, with 40 birds per box, with eight replicates per treatment. Fertile eggs hatchability, embryonic mortalities, discarded chicks, infertile eggs percent, first week chick mortality, chick weight, weight gain and first week weight multiplication were evaluated. Data were analyzed using the MIXED and NPAR1WAY procedures. There was an interaction between breeder line and laying age of the parent on hatchability of fertile eggs (P=0.0112), 1-day weight (P=0.0014), weight at 7 days (P=0.0002) and weight gain from 1 to 7 days (P=0.0042). There was interaction between fertile egg storage time and breeder line of the parent on weight at 7 days (P=0.0009), weight gain from 1 to 7 days (P=0.0005) and weight multiplication (P=0.0054). There was interaction between fertile egg storage time and laying age of the parent on 7-day weight (P=0.0203), 1- to 7-day weight gain (P=0.0286), and weight multiplication (P=0.0270). There was an effect of breeder line (P<0.0001), age at laying (P=0.0001) and fertile egg storage time (P=0.0236) on first period embryonic mortality. There was an effect of breeder line on second period embryonic mortality (P=0.0004) and discard chicks (P=0.0448). There was an effect of the laying age of the breeder on fourth period embryonic mortality (P=0.0144). There was an effect of breeder line (P<0.0001) and age at laying (P<0.0001) on the percentage of infertile eggs. Storage time of fertile eggs did not impact hatchability, but had a negative effect on first period embryonic mortality and first week weight. The Ross 95 breeder line showed better hatchability in breeder breeds between 30 and 40 weeks and the Cobb MV strain had better chick weights at hatching and at the end of the first week of life.

BANKING MEMBERS:
Externo à Instituição - GUSTAVO PERDONCINI
Externa ao Programa - 1434706 - STELAMARIS DEZEN
Presidente - 1085177 - VANESSA PERIPOLLI