Efficacy of a new sustained-release intraruminal selenium bolus
| Autor: | Renquist, B. J., Oltjen, J. W., Sween, M. L., Flavell, D. K., Maas, C. |
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| Jazyk: | angličtina |
| Rok vydání: | 2007 |
| Předmět: | |
| DOI: | 10.21423/bovine-vol41no2p134-137 |
| Popis: | Our objective was to test the efficacy of a new sustained-release selenium (Se) bolus versus negative and positive control beef cattle. Fifty-five English breed heifers (mean initial body weight 546ñ46 lb; 248ñ 21 kg) were randomly assigned to one of four treatment groups: one 120-day, sustained-release selenium (Se) bolus on day 0 (A-1X); one 120-day, sustained-release Se bolus on day 0 and a second bolus on day 121 (A-2X); one 365-day, sustained-release Se bolus on day 0 (B); and control (C), no supplemental Se. Heifers grazed Se-deficient native foothill range without any additional supplement. Body weights and blood samples were taken for Se analysis from animals in all four groups at days -28, 14, 28, 49, 63, 121, 183, 293 and 365. No evidence of excess Se intake was observed. Both blood and weight data were analyzed in a model with Se treatment as the main effect; a log transformation for blood Se was used to make variances across treatments similar. Blood Se concentrations were similar amongst treatment groups on day -28. However, on days 14, 28, 49, 63, 121, 183, 293 and 365, blood Se concentrations were higher for the three supplemented groups relative to the control group (P The Bovine Practitioner, Vol. 41, No. 2 (2007 Summer) |
| Databáze: | OpenAIRE |
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