Full text
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| Author(s): |
Luiz Guilherme Mezzena Gobato
Total Authors: 1
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| Document type: | Master's Dissertation |
| Press: | Pirassununga. |
| Institution: | Universidade de São Paulo (USP). Faculdade de Medicina Veterinária e Zootecnia (FMVZ/SBD) |
| Defense date: | 2017-12-04 |
| Examining board members: |
Alexandre Vaz Pires;
Marcos Vinicius Biehl;
Renato Shinkai Gentil
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| Advisor: | Alexandre Vaz Pires |
| Abstract | |
The present trial was carried out to evaluate the effect of narasin inclusion in mineral and protein supplements in the supplement intake and performance of grazing beef cattle. A hundred and fifty Nellore bull calves with 17.03 ± 0.06 months of age, initial body weight (BW) of 219.65 ± 1.62 kg, were assigned to the following treatments: mineral supplement (CON); mineral supplement + 1800 (1800) or 2750 (2750) mg narasin/kg of supplement; Protein mineral supplement (PROT) or PROT + 360 mg of narasin/kg of supplement (PROT 360). The bull calves were kept in a rotational stocking system with Brachiaria brizantha cv Marandu, during 5 periods of 28 days each. Adding narasin in the mineral supplement increased (P = 0.01) average daily gain (ADG) on the 1st period and decreased (P < 0.01) supplement intake on the 1st, 2nd and 3rd periods compared to CON. Bull calves in the 1800 and 2750 treatments had similar supplement intakes (P = 0.89) and ADG (P = 0.70) at the end of the experiment. In addition, the animals of the PROT and PROT 360 treatments consumed more supplement than the animals of the mineral mix treatments (P < 0.01 for all periods) and provided heavier animals (P < 0.01). Narasin decreased the protein supplement intake and did not affect ADG on the 1st and 2nd periods. The narasin affects the intake of supplements and performance in specific situations, however in overall, narasin addition in mineral and protein supplements did not affect the performance of grazing bull calves. (AU) | |
| FAPESP's process: | 16/23544-4 - Effect of narasin in supplement intake and beef cattle performance on pasture |
| Grantee: | Luiz Guilherme Mezzena Gobato |
| Support Opportunities: | Scholarships in Brazil - Master |