Banca de DEFESA: MARCELA CRISTINA FLEXA DO AMARAL

Uma banca de DEFESA de MESTRADO foi cadastrada pelo programa.
STUDENT : MARCELA CRISTINA FLEXA DO AMARAL
DATE: 30/01/2023
TIME: 14:00
LOCAL: Sala virtual
TITLE:

Genetic evaluation of productive traits in beef cattle of the Tabapuã breed raised in the Brazilian Amazon

KEY WORDS:

Gibbs sampling. Direct heritability. Additive maternal heritability. Animal genetic improvement.

PAGES: 32
BIG AREA: Ciências Agrárias
AREA: Zootecnia
SUBÁREA: Genética e Melhoramento dos Animais Domésticos
SUMMARY:

Cattle farming in the Legal Amazon has advanced in recent years, gaining prominence in the national productive scenario of bovine activity. The zebu breed, Tabapuã, included in the productive contingent of meat in the region, also stood out, due to its good adaptability in tropical regions and productive and reproductive precocity. However, knowledge about the genetics of this breed is still scarce, which makes it impossible to carry out the selection of the best animals in a genetic improvement program. Thus, the objective of this study was to genetically evaluate Tabapuã cattle with standardized weights at weight 205 (P205), 365 (P365) and 550 (P550) days of age. To carry out the genetic evaluation of the animals, growth data of Tabapuã cattle from the Brazilian Association of Zebu Breeders (ABCZ) were used, raised in a pasture regime. A total of 91,992 information on Tabapuã animals belonging to the Legal Amazon, referring to the states of Amazonas, Mato Grosso, Maranhão, Rondônia, Pará and Tocantins were used. For systematic effects, contemporary groups (CG) were included, which contained information on year of birth, season of birth (divided into rainy and less rainy seasons) and farm. Cow age at calving (IVP) was included as a linear and quadratic effect in the model. For the estimation of the variance components, the Bayesian method was used, using the Markov chain via Monte Carlo (MCMC) by the Gibbs Sampling method, executed through the F90 family program (BLUPF90). The additive direct heritability for traits P205, P365 and P550 days of age were 0.11, 0.20 and 0.10, respectively. For maternal additive heritability, the P205 trait was 0.04. The estimated additive direct heritability values were low for the characteristics evaluated by the Bayesian method. Therefore, despite the low values, this result may be related to the need to increase data collection/genealogy in the Legal Amazon region and to the use of few sires, causing low genetic variability.

BANKING MEMBERS:
Externo ao Programa - 1487106 - CRISTIAN FATURI
Externo à Instituição - HEDEN LUIZ MARQUES MOREIRA
Externo ao Programa - 3216540 - LEONARDO CASTELO BRANCO CARVALHO
Presidente - 1957010 - MARILIA DANYELLE NUNES RODRIGUES
Interno - 1143911 - RAYLON PEREIRA MACIEL