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| Author(s): |
Tatiane Souza Dos Santos
Total Authors: 1
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| Document type: | Doctoral Thesis |
| Press: | Botucatu. 2020-07-14. |
| Institution: | Universidade Estadual Paulista (Unesp). Faculdade de Medicina Veterinária e Zootecnia. Botucatu |
| Defense date: | 2020-06-19 |
| Advisor: | José Roberto Sartori |
| Abstract | |
The experiment was carried out to investigate the effects of copper and zinc supplementation on broiler diets, using two mineral sources (hydroxymineral or sulfate) on performance, carcass and parts yield, meat quality, mineral concentration in tissues and apparent ileal absorption of copper and zinc, bone characteristics and skin tissue, and indicators of health status. The total of 1,792 day-old male chicks of the Cobb 500 strain were randomly assigned to eight treatments with eight replicates per treatment. The hydroximineral sources used were: two levels of Cu hydroxychloride (CHC) (low and high), combined with three levels of Zn hydroxychloride (ZHC) (low, medium and high); and two additional treatments containing sulfate, with Cu sulfate monohydrate (SCM) (low and high) combined with a high level of Zn sulfate monohydrate (SZM). The treatments were: 15 mg/kg of SCM + 120 mg/kg of SZM; 150 mg/kg SCM + 120 mg/kg SZM; 15 mg/kg of CHC + 80 mg/kg of ZHC; 15 mg/kg of CHC + 100 mg/kg of ZHC; 15 mg/kg of CHC + 120 mg/kg of ZHC; 150 mg/kg of CHC + 80 mg/kg of ZHC; 150 mg/kg of CHC + 100 mg/kg of ZHC; 150 mg/kg of CHC + 120 mg/kg of ZHC. The means were submitted to ANOVA, and when significant, they were compared by Tukey’s and Dunnet’s tests with 5% significance. At 21 days of age, chickens fed diets containing highCHC showed better results for body weight, weight gain, feed conversion as compared to those receiving low-CHC. At the end of the experimental period, broilers in the group high-CHC combined with low or med-ZHC, showed better feed conversion as compared to those supplemented with low-CHC. In meat quality, the highest incidence of red in the breast muscle was observed in broilers supplemented with high-CHC as compared to those supplemented with low-CHC. Supplementation with low-ZHC level provided higher carcass yield and skin strenght as compared to med or high-ZHC. In bone quality, bone mineral density of the proximal epiphysis, the ash content, and the mineral contente of the tibia were positively influenced with low-CHC supplementation combined with med-ZHC as compared to highCHC. Therefore, we conclude that the hydroxymineral source presented satisfactory results, which can be considered as an alternative to replace sulfate in broiler diets. In addition, among supplemented copper and zinc levels, the high-CHC level was effictive for the best performance results, while the med-ZHC level was shown to improve bone development, skin integrity, and carcass yield parameters. Therefore, we suggest that copper and zinc supplementation can be used as a nutritional strategy to ensure the growth of healthy birds and prevent the incidence of bone problems. (AU) | |
| FAPESP's process: | 17/00338-2 - Effect of different copper and zinc sources in fed of broiler chicken on performance, quality of carcass and bone |
| Grantee: | Tatiane Souza dos Santos |
| Support Opportunities: | Scholarships in Brazil - Doctorate |