1998, Number 3
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Vet Mex 1998; 29 (3)
In vitro selenium liberation out of mineral boluses with four types of cement adhesives and in pH levels of 7.0, 6.5, 6.0 and 5.5
Rosiles MR, Gutiérrez OC, Valdez ÁR
Language: English/Spanish
References: 18
Page: 257-261
PDF size: 469.57 Kb.
ABSTRACT
Intraruminal mineral boluses made out of sodium selenite, copper sulphate and four adhesive cement types, as source of selenium, were assayed
in vitro for their liberation rate. Boluses (ten each group) were made with: cement for concrete (Group 1); cement for concrete plus copper sulphate (Group 2); wall brick cement (Group 3) and wall brick cement plus copper sulphate (Group 4). These boluses were kept in a 50 ml buffer phosphate solution to monitor Se liberation at pHs 7.0,6.5,6.0 and 5.5 during 64 days. Selenium measurement was carried out by atomic absorption spectroscopy on days 1,4,8,15,32 and 64. Final liberated selenium concentration was calculated for every bolus every day. Selenium output for cement type was statistically different, but it was not different for pHs within the same type of cement. Se concentration was 10 to 45 mg/bolus/day range in the four groups on day one. There was no Selenium liberation on day 32 in boluses in groups 1 and 2. On day 64, Group 3 liberated 0.1 mg/bolus/day, and Group 4 liberated from 0.5 to 1 mg Se/bolus/day. It is concluded that mineral boluses from Group 4 are the best choice for intraruminal selenium source.
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