Banca de QUALIFICAÇÃO: DENIS RODRIGUES SILVA

Uma banca de QUALIFICAÇÃO de MESTRADO foi cadastrada pelo programa.
STUDENT : DENIS RODRIGUES SILVA
DATE: 20/09/2024
TIME: 14:30
LOCAL: Bloco 2, miniauditório, campus de Parauapebas
TITLE:

Associated supplementation and/or use of ECG (equine chorionic gonadotropin) on the reproductive indexes of Nelore females in a grazing system

KEY WORDS:

reproductive biotechnologies, Nelore, supplementation

PAGES: 31
BIG AREA: Ciências Agrárias
AREA: Zootecnia
SUBÁREA: Produção Animal
SPECIALTY: Manejo de Animais
SUMMARY:

Brazil is one of the most important beef producers in the world, and its product is sold in more than 150 countries, with a production of 8.91 million tons in 2023. The production systems adopted in the country are pasture and confinement, the latter most commonly used in the finishing phase. In the breeding matrices category, production is exclusively on pasture with the adoption of low technology in nutrition, which negatively impacts reproductive indices due to nutritional deficit during gestation and postpartum, which makes it difficult to maintain the body condition score in the breeding season using reproductive biotechniques. Many farms have been using eCG (Equine Chorionic Gonadotropin) on the day of insemination to increase pregnancy rates. Given this context, the objective of this work will be to evaluate nutritional strategies associated or not with the use of eCG in FTAI (Fixed-time Artificial Insemination) protocols during the breeding season in beef cattle in the southeastern region of Pará. The experiment will be conducted for 90 days on a commercial farm located in the municipality of Canaã dos Carajás - PA. 150 multiparous Nelore cows with an average body weight of 450 kg will be evaluated and kept on Brachiaria brizantha cv. Marandú pastures with mineral supplementation. On the 25th day after parturition, all animals will be stratified according to weight, body condition score (BCS) assessment and subsequently distributed into experimental treatments (T) in a completely randomized design (CRD): T1: Without supplementation and use of eCG in the FTAI protocol; T2: With supplementation and without use of eCG in the FTAI protocol; T3: With supplementation and use of eCG in the FTAI protocol. During the entire experimental period, the animals will be kept in separate paddocks, equipped with covered drinkers and feeders, to which, in treatments T2 and T3, they will receive concentrated protein-energy supplementation at 0.5% of their weight throughout the experimental period. The data will be subjected to analysis of variance, analyzing according to CRD. Subsequently, the Tukey test will be applied to test the differences between the weaning methods. All statistical procedures will be performed using the SAS program (version 9.3, Statistical Analysis System, Cary, NC) adopting a critical level of 5% probability for type I error and body weight as a covariate.

COMMITTEE MEMBERS:
Externa à Instituição - ELIZANNE DE MOURA LIMA
Interna - 1354679 - KALIANDRA SOUZA ALVES
Presidente - 1632663 - LUIS RENNAN SAMPAIO OLIVEIRA
Interno - 1143911 - RAYLON PEREIRA MACIEL
Externa à Instituição - SANDRA DE SOUSA BARCELOS