Banca de DEFESA: CARLOS RENATO VIEGAS

Uma banca de DEFESA de DOUTORADO foi cadastrada pelo programa.
DISCENTE : CARLOS RENATO VIEGAS
DATA : 29/07/2019
HORA: 09:00
LOCAL: INSTITUTO DE ZOOTECNIA DA UFRRJ
TÍTULO:

Inclusion of additives in the diet of steers in the rearing and finishing phase.

PALAVRAS-CHAVES:

Additives, flavomycin, meat quality, salinomycin, virginiamycin.

PÁGINAS: 67
GRANDE ÁREA: Ciências Agrárias
ÁREA: Zootecnia
SUBÁREA: Pastagem e Forragicultura
RESUMO:

Brazil is one of the main beef producing countries, presenting the largest commercial herd. However, their productivity indices are still low in comparison with other countries, so to meet the expectations of the population's demand for meat products, practices that improve performance as the use of nutritional additives become indispensable for the development of a beef cattle breeding with shorter production cycle. In this context, the objective of this work was to evaluate the performance, carcass characteristics and beef quality of steers, with the use of the different additives (Flavomycin, Salinomycin, Virginiamycin) in their supplementation. Twenty-four uncastrated Nellore steers with mean body weight (CP) of 303 kg were used. During the rearing phase, protein / energy supplement provided in the amount of 3 g / kg live weight / animal was used in the four treatments as proposed below: T1 - Control treatment (supplementation without addition of additive); T2 - Supplementation + Flavinomycin (40 mg / animal / day); T3 - Supplementation + Virginiamycin (45mg / 100kg PV) and T4 - Supplementation + Salinomycin (120mg / animal / day). Twelve pickets with Massai grass (three per treatment) were used in a continuous stocking system with a duration of 92 days. After reaching 355 kg of CP, the animals entered the termination phase, when they were allocated in individual stalls receiving the additives from the previous stage and using as volumine the sugarcane silage in a proportion of voluminous: concentrated 30:70, the same remained in confinement for 90 days. The animals were evaluated every 28 days in relation to their performance and dry matter intake. The project was sent and approved by the Ethics Committee on the Use of Animals of the Federal Rural University of Rio de Janeiro under protocol number 23083.010360 / 2016-18. The animals were slaughtered in a commercial slaughterhouse after reaching the average weight of 510 kg. Carcass yield and daily carcass gain were then measured. The carcasses were transferred to a cold camera at a temperature of 1 ° C and remained for 24 hours. Afterwards, the Longissimus lumborum muscle was removed to measure the qualitative parameters of the meat: pH, temperature, color, weight loss by cooking, shear force and centesimal composition. A completely randomized design was used, with four treatments and three replications in the rearing phase, each animal pair per picket was considered an experimental unit, at the end the animals were individually confined and each animal was considered an experimental unit, totaling six replicates per animal. treatment. Analysis of variance was applied, and the significance test was applied, using the Tukey test (P <0.05). Data analyzes were performed using statistical software R. The use of flavomycin, virginiamycin or salinomycin for Nellore cattle resulted in similar growth performance, carcass characteristics and meat quality. No evidence of benefits to the rearing and finishing animals was observed to support the use of the additives at the doses used.

 

MEMBROS DA BANCA:
Externo à Instituição - FÁBIO TEIXEIRA DE PÁDUA - IFRJ
Externo ao Programa - 386938 - JOAO BATISTA RODRIGUES DE ABREU
Presidente - 387749 - JOAO CARLOS DE CARVALHO ALMEIDA
Interno - 2316004 - RONDINELI PAVEZZI BARBERO
Externo à Instituição - YURY TATIANA GRANJA SALCEDO - UNESP