SPECIAL STORY 62 FEED & ADDITIVE MAGAZINE September 2023 About Dr. Alessandra Monteiro Dr. Alessandra Monteiro is an animal scientist graduated in Brazil. In 2014 she started her PhD degree in Animal Production in partnership between the State University of Maringá (Brazil) and INRAe (France). In 2017, she worked as a Postdoctoral Research Associate at INRAe. Alessandra joined Animine in 2018 and have been working with the research and development group since then. Since 2023, Dr Alessandra Monteiro became the new R&D Director of Animine. About Axel Minetto He is an agronomic engineer and worked for the past 8 years in Valorex (France) where he gained solid monogastric and international skills to push nutritional solutions. His particulars skills are trace minerals, essential fatty acids, omega 3 enrichment, feed formulations, protein sources evaluations, nutritional matrix development and applications. Although these two trials were not designed to evaluate bioavailability, by tibia Zn results we can see that HiZox® provide at least the same or better Zn deposition than the Zn-chelate. Regarding performance parameters, HiZox® provided the same values as chelates: in trial 1 no differences on average daily gain (ADG) were observed (60.5 g/d on average); in trial 2, a tendency for a better ADG and FCR for HiZox® (61 g/d, and 1.39 g/g) in comparison to sulfate (58 g/d, 1.41 g/g) and chelates (57 g/d, 1.42 g/g) was observed. What happened? The unique physicochemical properties of HiZox® led to slow dissolution kinetics behavior under the acid conditions of the gizzard and proventriculus. This slow release of ions allowed this source to dissociate later and to be better absorbed by the enterocytes in the small intestine. The delay on its dissolution also avoided interactions with other feed compounds, specially phytate and calcium. CONCLUSION Zinc sulfates, although considered to be the reference source, can suffer a compromised bioavailability due to its fast solubilization and to interactions with feed compounds. Zinc oxide sources can have very different bioavailability values according to their physicochemical properties and dissolution kinetics behavior. HiZox®, a potentiated source of zinc oxide with small aggregates and agglomerated particles, has proven data on high bioavailability, not only compared with other oxides and sulfates, but also with the more known chelates in the market. Figure 2. Tibia zinc concentration (mg/kg ash) for different sources of zinc in broilers.
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