Respiratory control of arterial pH as temperature changes in rainbow trout Salmo gairdneri. Am. J. Physiol. 225(4) : 997-1002. 1973.-Arterial blood pH decreased as temperature increased, dpH/dT was 0.017 unit/"C and was independent of the acclimation history of the fish. Ventilation volume increased in proportion to oxygen uptake with temperature. Changes in water flow over the gills with temperature were associated with large changes in breathing rate and small changes in the volume of water pumped each breathing cycle. Percent oxygen extraction from water flowing over the gills and arterial oxygen tension did not change with temperature. The partial pressure of CO2 in arterial blood and the content of molecular CO2 in plasma
Ovariectomized mink were fed diets containing zearalenone (ZEN) at concentrations of 0, 10 or 20 ppm with or without 0.5% hydrated sodium calcium aluminosilicate (HSCAS) for 24 days. Zearalenone at 10 and 20 ppm caused a significant increase in uterine weights, while 20 ppm ZEN resulted in significantly higher vulva swelling scores when compared to controls. The presence of HSCAS in the diet did not alter these hyperestrogenic effects of ZEN. In a second experiment, female mink were provided diets containing 20 ppm ZEN, 20 ppm ZEN plus 0.5% HSCAS or a control diet from 1 January 1989 through whelping (25 April to 15 May 1989). The females were given an opportunity to mate with untreated proven breeder males beginning on 1 March (day 59 of exposure). ZEN did not have an effect on the number of females whelping but there was a significant increase in gestation length, a decrease in litter size and an increase in kit mortality from birth to 3 weeks of age when compared to the control group and the group receiving the combination of ZEN and HSCAS. These results suggest that HSCAS can alleviate some of the reproductive effects of ZEN which are not related to its estrogenic action.
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