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Abstract

The content of selenium (Se) in forage samples and the blood activity of glutathione peroxidase (GSH-Px; EC 1.11.1.9) of groups of lactating cows and heifers were evaluated between autumn and spring of 1999 in 12 dairy herds from IXth Region (38° S and 71° W) of Chile. Se concentration was...

Author(s)
Wittwer, F.; Araneda, P.; Ceballos, A.; Contreras, P. A.; Andaur, M.; Böhmwald, H.
Publisher
Facultad de Ciencias Veterinarias, Universidad Austral de Chile, Valdivia, Chile
Citation
Archivos de Medicina Veterinaria, 2002, 34, 1, pp 49-57
Abstract

An experiment was designed to study the effects of selenium supplementation with sodium selenite on blood activity of glutathione peroxidase (GSH-Px; EC 1.11.1.9) and liveweight gain of selenium deficient grazing dairy heifers from two dairy farms from the south of Chile. A total of 80 Friesian...

Author(s)
Oblitas, F.; Contreras, P. A.; Böhmwald, H.; Wittwer, F.
Citation
Archivos de Medicina Veterinaria, 2000, 32, 1, pp 55-62
Abstract

Heparinized blood samples were taken from 5 groups (15- to 60-day-old calves; 6- to 12-month-old female calves; heifers; prepartum cows, and cows in the early stages of lactation) of 7 animals each from 8 dairy herds in the Province of Valdivia Chile in the autumn of 1995. Groups of heifers and...

Author(s)
Ceballos, A.; Wittwer, F.; Contreras, P. A.; Böhmwald, H.
Citation
Archivos de Medicina Veterinaria, 1998, 30, 1, pp 13-22
Abstract

Two systems of supplementation were tested in 4 grazing Hereford herds between July and December 1993. The herds, with an average of 100 cows and between 7 months pregnant and 2 months post-calving, presented clinical cases of grass tetany, dead cattle and hypomagnesaemia. Herd 1 (pregnant cows)...

Author(s)
Wittwer, F.; Contreras, P. A.; Silva, N.; Böhmwald, H.
Citation
Archivos de Medicina Veterinaria, 1997, 29, 1, pp 25-33
Abstract

Blood samples were collected from 7 cows in late pregnancy and 7 cows in early lactation in 24 herds in the autumn and in the spring. Data on body condition scores, milk production and feeding were also obtained. The blood samples were analysed for haematology, β-hydroxybutyrate (BHB), urea,...

Author(s)
Contreras, P. A.; Valenzuela, L.; Wittwer, F.; Böhmwald, H.
Citation
Archivos de Medicina Veterinaria, 1996, 28, 1, pp 39-50
Abstract

Blood samples from 76 downer cows were analysed for β-hydroxy-butyrate, urea, total proteins, albumins, calcium, inorganic phosphorus, magnesium, sodium, potassium, aspartate aminotransferase (AST), glutamate dehydrogenase (GluDH) and γ-glutamyl transpeptidase (GGT) and the results compared with...

Author(s)
Wittwer, F. G.; Heuer, G.; Contreras, P. A.; Böhmwald, H.
Citation
Archivos de Medicina Veterinaria, 1993, 25, 1, pp 83-88
Abstract

Jugular blood samples were obtained from pregnant heifers (7), cows in early (7) and late (7) lactation, and from cows in late pregnancy (7). Serum Ca and Mg were measured by AAS, and Pi by colorimetry. Av. Ca, Pi and Mg concentrations were 2.31±0.15, 1.89±0.43 and 0.89±0.12 mmol/litre...

Author(s)
Contreras, P. A.; Wittwer, F.; Böhmwald, H.
Citation
Archivos de Medicina Veterinaria, 1990, 22, 2, pp 185-189
Abstract

Author(s)
Wittwer, F.; Contreras, P.; Böhmwald, H.; Anrique, R.; Fuchslocher, R.
Citation
Archivos de Medicina Veterinaria, Chile, 1988, 20, 2, pp 118-125
Abstract

Author(s)
Wittwer, F.; Böhmwald, H.; Contreras, P. A.; Filoza, J.
Citation
Archivos de Medicina Veterinaria, Chile, 1987, 19, 2, pp 35-45
Abstract

Blood samples from 350 cattle in 14 herds with no history of leucosis, in 7 age groups, were examined by the method of Schalm (1965); none of the animals were in the last month of pregnancy or at calving. Total leucocytes showed a significant variation with age, increasing to a maximum at 1-2 years ...

Author(s)
Wittwer, F.; Bohmwald, H.
Citation
Archivos de Medicina Veterinaria, 1974, 6, No.1, pp 32-36