Apparent Absorption of Zinc from Supplemental Inorganic and Organic Sources to Nile Tilapia Oreochromis doticus Juveniles |
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| Authors: | Marcelo Vinícius do Carmo E Sà Luiz Edivaldo Pezzato Margarida Maria Barros Pedro de Magalhates Padilha |
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| Institution: | Animal Science Postgraduate Program, Faculty of Animal Science and Veterinary Medicine, Lageado Experimental Farm, Srio Paulo State University, Botucatu Campus, Srio Paulo. Brazil;Department of Animal Nutrition and Breeding, Faculty of Animal Science and Veterinary Medicine, Lageado Experimental Farm, Scão Paulo State University, Botucatu Campus, Srão Paulo, Brazil;Department of Chemistry, Institute of Biosciences, São Paulo State University, Botucatu Campus, Scão Paulo, Brazil |
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| Abstract: | Abstract— Nile tilapia Oreochromis niloticus fingerlings were fed with purified or practical diets, supplemented with 150 mg Zd/kg, from different sources. Dry matter (DM), crude protein (CP), ether extract (EE), and gross energy (GE) apparent digestibility coefficients (ADC), as well as zinc, copper, calcium, and phosphorus apparent absorption coefficients (AAC) were determined by the addition of 0.1% chromic oxide to the diets. The supplemental zinc sources utilized were commercial grade zinc sulfate monohydrate (ZnSO)4, zinc oxide (ZnO) and a zinc amino acid complex (Zn‐AA). Analytical grade zinc sulfate heptahydrate was also utilized as a standard reference zinc source. There was a significant difference between purified (74.9%) and practical (41.3%) zinc AAC for the ZnO supplemented diets (P< 0.05). The supplemental zinc sources presented similar AAC when purified diets were utilized. However, ZnSO4, was the best supplemental zinc source when practical type diets were used. There were no significant differences between supplemental zinc AAC from ZnSO4, (68.9%), and supplemental zinc AAC from Zn‐AA (61.3%) in practical diets, but Zn‐AA diet showed a statistically lower zinc AAC when compared with the standard zinc source diet (75.6%). The practical diet supplemented with ZnO had the worst supplemental zinc AAC (41.3%). Dietary copper (74.2%), calcium (70.9%), and phosphorus (71.9%) AAC of the practical diets supplemented with ZnO were statistically lower (P < 0.05) than the respective AAC of the practical ZnSO4, supplemented diets (83.6%, 84.1%, 87.1%). The ADC of the practical ZnO supplemented diet for DM (76.30/), CP (88.6%), EE (82.4%), and GE (81.6%) were statistically lower than the respective ADC of the ZnSO4, practical diet (86.0,92.7,93.6,89.6%, respectively) and those ADC of the Zn‐AA practical diet (84.7,92.7,93.7, 88.2%, respectively) (P < 0.05). Hence, these results indicate that ZnSO4, and Zn‐AA have equivalent intestinal absorption as supplemental zinc sources for Nile tilapia juveniles and both are superior to ZnO. |
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