Banca de QUALIFICAÇÃO: MATHEUS BENTO LESSA

Uma banca de QUALIFICAÇÃO de MESTRADO foi cadastrada pelo programa.
STUDENT : MATHEUS BENTO LESSA
DATE: 28/04/2025
TIME: 14:00
LOCAL: De forma remota link: https://meet.google.com/csg-ajpj-teu
TITLE:

PERFORMANCE OF NELORE AND F1 ABERDEEN ANGUS X NELORE CATTLE FINISHED IN CONFINEMENT

KEY WORDS:

Heterosis, performance, feed efficiency

PAGES: 29
BIG AREA: Ciências Agrárias
AREA: Zootecnia
SUBÁREA: Produção Animal
SPECIALTY: Criação de Animais
SUMMARY:

Crossbreeding of cattle breeds is a widely used strategy to improve productivity and meat quality. The use of crosses between zebu breeds, such as the Nelore, and taurine breeds, such as the Angus, has been shown to be effective in combining the rusticity and adaptability of the zebu breeds with the precocity and meat quality of the taurine breeds. The Nellore-Angus cross is particularly interesting due to its ability to take advantage of heterosis, which can result in significant gains in terms of productivity and feed efficiency. In this context, the study evaluated the performance of Nellore and F1 Angus-Nellore cattle in feedlot. The work was conducted at the Cattle Performance Center of the Federal Rural University of the Amazon (UFRA), Parauapebas Campus. A total of 12 steers were used, with a mean age of 24 months and initial weight of approximately 350 kg, divided into two genetic groups: Nellore (Group 1) and 1/2 Nellore + 1/2 Angus (Group 2), distributed in a completely randomized design, with an adaptation period of 21 days and 97 days of supply of the final diet. Dry matter intake, weight gain, feed efficiency and carcass yield variables were analyzed. The results showed that F1 Angus-Nellore animals had better productive performance and carcass characteristics compared to Nellores. During the adaptation phase, there was no difference (P > 0.05) in dry matter intake between the two genetic groups. However, after adaptation, F1 Angus-Nellore animals showed higher (P < 0.05) dry matter intake as a percentage of body weight and better feed efficiency. In addition, F1 Angus-Nellore had higher (P < 0.05) net weight gain, average daily gain, gain in net carcass, average gain in carcass, rib eye area and produced more arrobas. The study concludes that F1 Angus-Nellore animals have better productive performance and carcass characteristics compared to Nellores, making them an attractive option for producers looking to maximize productivity and feed efficiency in confinement systems. In addition, the results suggest that Nellore-Angus crossing can be an effective strategy to improve productivity and feed efficiency in confinement systems.

COMMITTEE MEMBERS:
Externo à Instituição - UBIRAJARA OLIVEIRA BILEGO
Interna - 3160888 - FLAVIA MARTINS DE SOUZA
Presidente - 1143911 - RAYLON PEREIRA MACIEL