Banca de DEFESA: DENIS RODRIGUES SILVA

Uma banca de DEFESA de MESTRADO foi cadastrada pelo programa.
STUDENT : DENIS RODRIGUES SILVA
DATE: 28/02/2025
TIME: 15:00
LOCAL: Miniauditório, bloco 2, UFRA, 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:

Breeding season, Body condition score, Pregnancy rate

PAGES: 57
BIG AREA: Ciências Agrárias
AREA: Zootecnia
SUBÁREA: Produção Animal
SPECIALTY: Manejo de Animais
SUMMARY:

In beef cattle farming, females are the basis of the production system, therefore, special attention must be given to this category so that there is no compromise in the following phases of the meat production system. Adequate nutritional management has an impact on the progress and objectives of the production system, being important for obtaining better pregnancy rates and offspring development. Given this context, the objective of this study was to evaluate nutritional strategies associated or not with the use of equine gonadotropic hormone (eCG) in FTAI protocols during the breeding season in beef cattle in the southeastern region of Pará. The experiment was conducted for 90 days (September to December 2023) on a commercial farm, located in the municipality of Canaã dos Carajás - PA. One hundred and fifty calving cows (multiparous) of the Nelore breed, with an average body weight of 473 kg (SD ± 49.3 kg) and kept on Brachiaria brizantha cv. Marandú pastures, were evaluated. The animals were distributed into three treatments: 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. The matrices were subjected to FTAI according to the protocol from 0 to 10 days, the PD was performed 30 days after AI. Weight and BCS at the beginning of the IATF and PD 30 protocol, serum IGF-1, cortisol, beta-hydroxybutyrate and glucose levels were assessed. The variables live weight, glucose, cortisol, beta-hydroxybutyrate, IGF-1 were subjected to the Tukey test. The variables initial BCS and BCS in the PD were submitted to the nonparametric Kruskal-Wallis test. The Pregnancy Diagnosis variables were subjected to the Fisher Exact Test and Chi-square statistic. All statistical procedures were performed using the programs SISVAR version 5.6 DES/UFRA, AgroEstat 1.1.0.712 rev. 77 and Social Science Statistics 2018 Jeremy Stangroom, adopting a critical level of 5% in all cases. There was no statistical difference (P>0.05) within each treatment for the different weighing moments. The weight in DG30 was affected by the treatments (P<0.05), where T1 presented the lowest average weight (460.2 kg). BCS on D0 and PD30 variables were not affected by treatments or by the weighing time (P>0.05). Blood metabolites glucose, beta-hydroxybutyrate and cortisol were affected by treatments (P<0.05). Where, T1 presented higher concentrations of these metabolites in the blood of Nellore cows in a pasture system. IGF-1 was higher in T2 and T3, differing from T1. For the positive and negative PD variables there was no difference when analyzing T1 vs T3 and T2 vs T3 and T1 vs T2 for the Chi-square and Fisher's Exact Tests. Protein-energy supplementation and supplementation associated with the use of eCG in broiler breeders improved weight gain, but did not affect reproductive parameters. The use of eCG without supplementation increases blood glucose, beta-hydroxybutyrate and cortisol levels, but does not affect reproductive parameters.

COMMITTEE MEMBERS:
Externa à Instituição - GABRIELA DE JESUS COELHO - UFRA
Interna - 1354679 - KALIANDRA SOUZA ALVES
Presidente - 1632663 - LUIS RENNAN SAMPAIO OLIVEIRA