Abstract
The objective was to evaluate the effect of propolis-based products (PBP) on performance, digestibility, microbial production and carcass characteristics of feedlot young bulls. Twenty-seven crossbred young bulls were used, with 353 ± 28 kg of body weight in a completely randomized experimental design, divided in three treatments: two diets with PBP with different dosages (PBP1= 0.018 mg g -1 and PBP2= 0.036 mg g -1 of total flavonoids in chrysin) and control diet (CON). To determine total digestibility, the indigestible dry matter was used as an internal marker, while microbial production was estimated from purine derivatives in urine, collected by the spot method. The evaluated carcass characteristics were: hot carcass weight, dressing percentage, conformation, Longissimus muscle area, fat thickness, colour, texture, marbling, pH, cushion thickness and percentages of muscle, bone and fat. The studied variables were subjected to analysis of variance with 5% probability. The addition of propolis had no effect on DM and nutrients digestibility (except the ADF, which was higher) or efficiency of microbial synthesis. Carcass characteristics were not affected by the experimental treatments. The PBP in the used dosages should be reviewed and higher dosages should be tested.
Highlights
Ionophore additives are used in ruminant nutrition; no animal-based food products containing these substances can be produced in or enter in Europe since January 2006, according to European Union legislation, as published in the Official Journal of the European Union (2003)
The aim of the present research was to evaluate the effects of propolis-based products in diets containing the same forage:concentrate ratio (50:50) on performance, digestibility, microbial production and carcass characteristics of feedlot young bulls
The absence of propolis effects in this study may be related to lower levels of flavonoids present in the propolis-based products used
Summary
Ionophore additives are used in ruminant nutrition; no animal-based food products containing these substances can be produced in or enter in Europe since January 2006, according to European Union legislation, as published in the Official Journal of the European Union (2003). With these facts, alternatives have been sought to replace these additives with natural ones. Animal Sciences as it is a product with numerous pharmacological properties, including antimicrobial activity (PARK et al, 2002). The ability of propolis to inhibit the growth of microorganisms is its most popularly known and scientifically proven pharmacological activity.
Sign-in/Register to view highlights & summary Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
