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| Leopoldino,W.M.; Lana,R.P.; Borges,A.C.; Mantovani,H.C.; Teixeira,R.M.A.; Oliveira,J.S.; Jaremtchuk,A.R.; Eifert,E.C.; Martins,R.G.R.. |
| Ruminal fluid from steers fed on pasture was incubated with artificial media at pH 5.5 and 7.0 in two experiments. In the first, the effect of monensin level on resistance of ruminal bacteria to potassium depletion was evaluated; in the second, effects of the ionophores monensin and lasalocid on ammonia and protein production were quantified. In experiment 1, culture media affected potassium level. The monensin concentration needed to cause half maximal potassium depletion was 2.77µM at pH 5.5 but was 0.056µM at pH 7.0, showing that bacteria incubated at pH 5.5 were more tolerant to monensin than those incubated at pH 7.0. Both ionophores as well as increased acidity caused decreased ammonia production. Both ionophores inhibited ammonia production by 56%,... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Bacteria; Lasalocid; Monensin; PH; Rumen. |
| Ano: 2005 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0102-09352005000600012 |
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| Vedovatto,Marcelo; Diogo,José Mauro da Silva; Beltrame,João Artêmio Marin; D'Oliveira,Marcella Cândia; Silva,Cássio José da; Mendes,Clayton Quirino; Cabral Filho,Sergio Lucio Salomon; Franco,Gumercindo Loriano. |
| ABSTRACT The objective was to evaluate the addition of antibiotic growth promoters to free-choice mineral supplement on ingestive behavior, mineral intake, and growth performance of grazing bulls. Sixty Nellore bulls [initial body weight (BW) of 219±17.8 kg and 15±2 months of age] were divided in 12 marandu grass paddocks. The treatments were: mineral supplement (control), mineral supplement + virginiamycin (VIRG), mineral supplement + lasalocid sodium (LASA) and mineral supplement + salinomycin sodium (SALI). Mineral supplements were formulated with target intake of 60 g d−1 and the growth promoters of 75 mg 100 kg−1 of BW. The experimental design was the completely randomized blocks. There was no treatment effect on ingestive behavior or mineral intake;... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Feed additive; Cattle; Ionophore; Lasalocid; Salinomycin; Virginiamycin. |
| Ano: 2019 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-35982019000100706 |
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