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Abstract

AIM: To determine the effect of grazing pasture that had a low selenium (Se) concentration on serum concentrations of triiodothyronine (T3) and thyroxine (T4), and erythrocyte glutathione peroxidase (GSH-Px) activity in dairy cows. METHODS: Forty pregnant Friesian cows were grazed on pasture that...

Author(s)
Contreras, P. A.; Wittwer, F.; Matamoros, R.; Mayorga, I. M.; Schaik, G. van
Publisher
New Zealand Veterinary Association, Wellington, New Zealand
Citation
New Zealand Veterinary Journal, 2005, 53, 1, pp 77-80
Abstract

There is no information available about plasma retinol concentration in grazing heifers in Chile, for this reason the plasma retinol concentration was measured in dairy heifers grazing during the winter and spring seasons on paddocks in the south of Chile. Fifteen clinically healthy Friesian...

Author(s)
Chihuailaf, R. H.; González, C. S.; Wittwer, F.; Contreras, P. A.
Publisher
Facultad de Ciencias Veterinarias, Universidad Austral de Chile, Valdivia, Chile
Citation
Archivos de Medicina Veterinaria, 2008, 40, 1, pp 65-68
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

Forage samples were obtained from 25 dairy farms in the 9th and 10th regions of Chile in 1999. Iodine (I) concentrations were analysed by a kinetic-colorimetric method. It was shown that iodine samples were below 0.4 ppm on a dry matter basis, averaging 0.20±0.08 ppm. Forage with normal I...

Author(s)
Contreras, P. A.; Ceballos, A.; Matamoros, R.; Wittwer, F.
Publisher
Facultad de Ciencias Veterinarias, Universidad Austral de Chile, Valdivia, Chile
Citation
Archivos de Medicina Veterinaria, 2003, 35, 1, pp 75-79
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

An outbreak of white muscle disease (WMD) or nutritional muscular dystrophy was reported in a herd of 56 Red Friesian calves, where 18 calves aged 4 to 5 months died in a period of 45 days (Chile, date not given). The signs observed were tachypnoea, difficulty in walking, tachycardia, dilated...

Author(s)
Contreras, P. A.; Paredes, E.; Wittwer, F.; Carrillo, S.
Publisher
Facultad de Ciencias Veterinarias, Universidad del Zulia, Maracaibo, Venezuela
Citation
Revista Cientifica, Facultad de Ciencias Veterinarias, Universidad del Zulia, 2005, 15, 5, pp 401-405
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

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