Banca de DEFESA: FRANCIELLE SOARES GONÇALVES

Uma banca de DEFESA de MESTRADO foi cadastrada pelo programa.
STUDENT : FRANCIELLE SOARES GONÇALVES
DATE: 10/08/2022
TIME: 13:00
LOCAL: Web Conferência - Google Meet - https://meet.google.com/ndd-smif-nzz.
TITLE:

Use of essential oils as an alternative to monensin for beef cattle in feedlot.

KEY WORDS:

rumen fermentation; nutrition; essential oils; pH; ruminants.

PAGES: 45
BIG AREA: Ciências Agrárias
AREA: Medicina Veterinária
SUMMARY:

Essential oils are secondary compounds extracted from plants with potential for modulating rumen fermentation. Thus, the objective of the study was to evaluate the use of a blend of essential oils as an alternative to monensin for confined beef cattle and its effects on rumen fermentation, blood parameters and animal performance. Sixty castrated males of Braford breed standard, average initial live weight of 250 kg and age 9.05 months were used. In an entirely randomized design, with 20 animals per treatment, divided into 12 feedlot pens, with the following treatments: control (CTL, feed without additives); monensin (MON, feed with inclusion of 40 mg/Kg of DM) and alternative (ALT, feed with inclusion of 300 mg/Kg of DM). The animals were fed ad libitum on a diet containing 794.3 g feed/kg DM and 205.7 g silage/kg DM. The results show that the pH of monensin (MON) and alternative (ALT) groups were equal (P>0.05) and lower than the control group (CTL) (P<0.05). Rumen NH3-N concentration was equal for CTL and MON groups (P>0.05) and higher than ALT group (P<0.05). In this study, there were no significant differences in total VFA concentration and production as well as acetate propionate ratio among treatments. The concentrations of albumin and AST did not show significant differences between the treatments. However, the urea value of CTL group was higher compared to MON and ALT groups (P<0.05). Cholesterol was increased in the ALT group, followed by MON and CTL. For GGT values, the ALT group showed reduced values compared to MON and CTL. LDH concentration was different between CTL and MON treatments and showed a similar response to ALT for both. There was a difference in dry matter consumption (CMS,Kg/day) (P<0.001) similar between CTL and ALT and higher than MON group. For average daily gain (GMD Kg) and feed conversion (FC) there was difference between treatments (P<0.05), however ALT group showed similar result compared to MON and CTL. The live weight at slaughter, hot carcass weight (HWL kg) and carcass yield did not differ between treatments (P>0.05), however the HWL was higher in animals fed with ALT and CTL compared to those fed with MON diet (260, 259 and 255 kg, respectively). The carcass variables evaluated by ultrasound AOL (cm2), AOL/100Kg, RCF, Marbling (%) EGS (mm), EGS/100Kg, Rump (mm) showed no significant difference (P>0.05).

BANKING MEMBERS:
Externa à Instituição - MAGALI FLORIANO DA SILVEIRA - UTFPR
Externa ao Programa - 2276251 - ANDRESSA FERNANDA CAMPOS
Presidente - 1760760 - CARLOS EDUARDO NOGUEIRA MARTINS