Banca de DEFESA: DANIELLE DE OLIVEIRA PIÃO

Uma banca de DEFESA de MESTRADO foi cadastrada pelo programa.
STUDENT : DANIELLE DE OLIVEIRA PIÃO
DATE: 30/07/2020
TIME: 09:00
LOCAL: INSTITUTO DE ZOOTECNIA
TITLE:

Consumption, digestibility and performance of beef heifers in feedlot receiving mycotoxin contaminated diet

KEY WORDS:

Beef Cattle, Finishing, Nutrition, Zearalenone.

PAGES: 33
BIG AREA: Ciências Agrárias
AREA: Zootecnia
SUBÁREA: Produção Animal
SUMMARY:

PIÃO, Danielle de Oliveira. Consumption, digestibility and performance of beef heifers in feedlot receiving mycotoxin contaminated diet. 2020. 22p. Master Thesis (Master of Science in Animal Science, Animal Production). Instituto de Zootecnia, Universidade Federal Rural do Rio de Janeiro, Seropédica, RJ, 2020. In intensive beef cattle systems, silage, corn and soy bean and its coproducts are largely used. Although these ingredients are highly subjected to fungi and its mycotoxins contaminations, that may implicate on immunologic challenge and reduce animal production. The main goal of this paper was to evaluate the effect of the mycotoxin contamination on the confined heifer’s diet, analyzing intake, digestibility and performance. The present study was developed at Setor de Reprodução Animal (SFRIA) linked to the Instituto de Zootecnia (IZ) of Universidade Federal Rural do Rio de Janeiro (UFRRJ). Twenty non-pregnant, healthy, over 18 months old and initial body weight of 330±30kg Nellore (Bos taurus indicus) breed heifers were used, randomly distributed in two treatments: 1) control (no contamination), e 2) Zearalenone contaminated (±300 ppb).The diet was composed by 70% forage (corn silage) and 30% feed (dry matter based) was provided two times a day (40%: 7am, e 60%: 4pm), with daily adjustments (increase or decrease) aiming 5% leftovers. The individual dry matter intake and digestibility were estimated using external marker (Lipe®: 500 mg) and internal marker (neutral detergent fiber indigestible fraction). The performance was calculated considering the difference between final and initial body weight, divided by the number of days (14 adaptation days + 84 experimental days). The experimental design was completely randomized. Each animal was considered one experimental unity (10 per treatment, n=20). Assumptions were tested for the variance analyzes (error normality, independence of errors and homogeneity of variances), then it was performed (p<0.05). Intake differences (p=0.96) and dry matter intake digestibility (p=0.62) were not found. The performance did not vary in function of the Zearalenone ingestion (p=0.68). The diet’s contamination with 300 ppb of Zearalenone did not influenced the intake, digestibility and performance of Nellore heifers in feedlot.
 

BANKING MEMBERS:
Externo à Instituição - RENAN LUCAS MIORIN - IFMT
Externo ao Programa - 3058101 - ANDRE MORAIS MOURA
Presidente - 2316004 - RONDINELI PAVEZZI BARBERO