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Abstract

The aim of this study was to propose reference intervals (RI) for blood markers of mineral balance in prepartum and lactating groups of dairy cows in the South of Chile. The blood concentrations values of calcium, inorganic phosphate, magnesium, sodium, potassium, copper and zinc and ratio...

Author(s)
Wagemann, C.; Wittwer, F.; Chihuailaf, R.; Noro, M.
Publisher
Facultad de Ciencias Veterinarias, Universidad Austral de Chile, Valdivia, Chile
Citation
Archivos de Medicina Veterinaria, 2014, 46, 1, pp 121-125
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

The aim of this study was to describe and compare the frequency of mineral imbalances in groups of prepartum and lactating dairy cows in the south of Chile. The blood concentrations of calcium, inorganic phosphate, magnesium, sodium, potassium, copper and zinc, calcium:inorganic phosphate ratio and ...

Author(s)
Wagemann, C.; Wittwer, F.; Chihuailaf, R.; Noro, M.
Publisher
Facultad de Ciencias Veterinarias, Universidad Austral de Chile, Valdivia, Chile
Citation
Archivos de Medicina Veterinaria, 2014, 46, 3, pp 363-373
Abstract

The purpose of this study was to evaluate the effect of different levels of concentrate supplementation on the productive response of dairy cows fed high daily herbage allowance of spring pasture. The study was conducted from September to November of 2005. 28 spring calving Friesian cows were...

Author(s)
Pulido, R. G.; Escobar, A.; Follert, S.; Leiva, M.; Orellana, P.; Wittwer, F.; Balocchi, O.
Publisher
Facultad de Ciencias Veterinarias, Universidad Austral de Chile, Valdivia, Chile
Citation
Archivos de Medicina Veterinaria, 2009, 41, 3, pp 197-204
Abstract

This study was undertaken to evaluate the influence of daily pasture allowance and concentrate type on ruminal pH, the ammonia nitrogen (N-NH3) and the volatile fatty acid (VFA) concentrations in the rumen of autumn-calving dairy cows in early lactation. Three Chilean Black Friesian cows fitted...

Author(s)
Sotelo, J.; Noro, M.; Wittwer, F.; Smulders, J. P.; Pulido, R. G.
Publisher
Facultad de Ciencias Veterinarias, Universidad Austral de Chile, Valdivia, Chile
Citation
Archivos de Medicina Veterinaria, 2012, 44, 2, pp 167-172
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

A significant proportion of cattle receive inadequate dietary Se because of its low content in soils and pastures of various regions of the world. Several economically important diseases in dairy cows, such as mastitis, have been associated with Se deficiency. The objective of this study was to...

Author(s)
Ceballos, A.; Kruze, J.; Barkema, H. W.; Dohoo, I. R.; Sanchez, J.; Uribe, D.; Wichtel, J. J.; Wittwer, F.
Publisher
Elsevier Inc., Philadelphia, USA
Citation
Journal of Dairy Science, 2010, 93, 4, pp 1468-1477
Abstract

Blood metabolites concentrations present diurnal variations related to food intake. An experiment was carried out to evaluate diurnal variations in the blood metabolites concentration related to feeding behavior in grazing lactating cows. Eight Frisian cows, 60 to 90 days of lactation, were kept...

Author(s)
Noro, M.; Borkert, J.; Hinostroza, G. A.; Pulido, R.; Wittwer, F.
Publisher
Facultad de Ciencias Veterinarias, Universidad del Zulia, Maracaibo, Venezuela
Citation
Revista Cientifica, Facultad de Ciencias Veterinarias, Universidad del Zulia, 2011, 21, 2, pp 125-130
Abstract

Pasture is a major component of the diet for dairy cows in Chile, and grain is often used as a supplement to increase milk production. The quantity of grain offered is affected by price and return to the farmer, but 6 kg/day is typical of many situations. However the benefits of feeding grain more...

Author(s)
Pulido, R. G.; Muñoz, R.; Lemarie, P.; Wittwer, F.; Orellana, P.; Waghorn, G. C.
Publisher
Elsevier, Amsterdam, Netherlands
Citation
Livestock Science, 2009, 125, 2/3, pp 109-114
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

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