Effect of dietary sodium bicarbonate and sodium bicarbonate plus magnesium oxide on rumen fluid and milk yield in cows
1992
Contreras, P.A. (Universidad Austral de Chile, Valdivia (Chile). Inst. de Ciencias Veterinarias) | Larrain, C. | Wittwer, F. | Flores, J. | Bohmwald, H.
Twenty four lactating Friesian cows were allocated into three homogeneous groups, in order to study the effect of dietary sodium bicarbonate and sodium bicarbonate plus magnesium oxide on the number of rumen protozoa, pH, reduction of methylene blue, milk yield and milk fat. The first group was treated with NaHCO3(120 g/cow/day). The second group received NaHCO3(120 g/cow/day) plus MgO(30 g/cow/day). The third was an untreated control group. The cows remained in feedlot and were fed with hay crop silage and corn silage ensuring an intake of at least 100 kg of dry matter and 4 kg/d of concentrate, plus 1 additional kg every two litres of milk yield over 15. Rumen fluid samples were collected seven times, every 3 weeks, in order to study the number of protozoa/ml, reduction of methylene blue and pH. Milk yield and milk fat percentage were also measured. It is concluded that addition of NaHCO3 and NaHCO3 + MgO increased the number of protozoa in 46.200 and 83.800 protozoa per ml respectively; significantly higher (P
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