Effect van een kruidenextract op berengeur, agressief en seksueel gedrag bij biologische varkens

An experiment with 273 entire males was conducted on an organic pig farm. Half of these males received a herbal extract in the drinking water to reduce mounting behaviour and boar taint. The herbal extract did not affect sexual behaviour and boar taint. Only two carcasses (0,7%) had a typical boar taint. However a complete change towards non castration for organic pigs is not yet applicable partly because of international trade difficulties. A follow up study will be prepare

Curious Minds - Kunsteducatie

Presentatie tijdens werkbezoek afdeling Cultuureducatie aan Hanzehogeschool Groninge

Op weg naar talentkrachtige kunsteducatie

Inleiding op het themanummer over Curious Minds - Kunsteducatie van Cultuur + Educatie, waarin de uitgangspunten van talentkrachtige kunsteducatie worden uiteengezet

Benthic studies of the Southern Bight of the North Sea and its adjacent continental estuaries: Progress Report 1

A summary of work on benthic communities in the Southern Bight of the North Sea and adjacent estuaries is presented. This work investigates patterns in species composition, in density and biomass which are stable enough, both in the temporal and spatial domain, to be used as baseline data in monitoring, and from which information on systems functioning can be obtained

PULMONARY CIRCULATION AND GAS EXCHANGE AT EXERCISE IN SHERPAS AT HIGH ALTITUDE.

Tibetans have been reported to present with a unique phenotypic adaptation to high altitude characterized by higher resting ventilation (VE) and arterial oxygen saturation (SpO2), no excessive polycythemia and lower pulmonary artery pressures (Ppa) compared to other high altitude populations. How this affects exercise capacity is not exactly known. We measured aerobic exercise capacity during an incremental cardiopulmonary exercise test (CPET), lung diffusing capacity for carbon monoxide (DLCO) and nitric oxide (DLNO) at rest, and mean Ppa (mPpa) and cardiac output by echocardiography at rest and at exercise in 13 Sherpas and in 13 acclimatized lowlander controls at the altitude of 5050 m in Nepal. In Sherpas versus lowlanders, SpO2 was 86 ± 1 vs 83 ± 2 %, mean ± SE (P NS), mPpa at rest 19 ± 1 vs 23 ± 1 mmHg (P<0.05), DLCO corrected for hemoglobin 61 ± 4 vs 37 ± 2 ml/min/mmHg (P<0.001), DLNO 226 ± 18 vs 153 ± 9 ml/min/mmHg (P<0.001), maximum oxygen uptake (VO2max) 32 ± 3 vs 28 ± 1 ml/kg/min (P NS) and ventilatory equivalent for carbon dioxide at anaerobic threshold 40 ± 2 vs 48 ± 2 (P<0.001). VO2max was correlated directly to DLCO and inversely to the slope of mPpa-cardiac index relationships in both Sherpas and acclimatized lowlanders. We conclude that Sherpas compared to acclimatized lowlanders have an unremarkable aerobic exercise capacity but with less pronounced pulmonary hypertension, lower ventilatory responses and higher lung diffusing capacity.JOURNAL ARTICLESCOPUS: ar.jinfo:eu-repo/semantics/publishe

Exercise pathophysiology in patients with chronic mountain sickness exercise in chronic mountain sickness

ABSTRACT: BACKGROUND:Chronic mountain sickness is characterized by a combination of excessive erythrocytosis, severe hypoxemia and pulmonary hypertension, all of which affect exercise capacity. METHODS:Thirteen chronic mountain sickness patients and 15 healthy highlander and 15 newcomer lowlander controls were investigated at an altitude of 4350m (Cerro de Pasco). All of them underwent measurements of lung diffusing capacity for nitric oxide and carbon monoxide at rest, echocardiography for estimation of mean pulmonary arterial pressure and cardiac output at rest and at exercise, and an incremental cycle ergometer cardiopulmonary exercise test. RESULTS:The chronic mountain sickness patients, the healthy highlanders and the newcomer lowlanders reached a similar maximal oxygen uptake, at 32±1, 32±2 and 33±2 ml.min(-1).kg(-1) respectively, mean ± SE, p=0.8, with ventilatory equivalents for CO(2) versus end-tidal PCO(2), measured at the anaerobic threshold, of 0.9±0.1, 1.2±0.1 and 1.4±0.1 mmHg(-1), p<0.001, arterial O(2) content of 26±1, 21±2 and 16±1 ml.dl(-1), p<0.001, diffusing capacity for carbon monoxide corrected for alveolar volume of 155±4, 150±5 and 120±3% predicted, p<0.001, with diffusing capacity for nitric oxide and carbon monoxide ratios of 4.7±0.1 at sea-level decreased to 3.6±0.1, 3.7±0.1 and 3.9±0.1, p<0.05 and a maximal exercise mean pulmonary arterial pressure at 56±4, 42±3, and 31±2 mmHg, p<0.001. CONCLUSIONS:The aerobic exercise capacity of chronic mountain sickness patients is preserved in spite of severe pulmonary hypertension and relative hypoventilation, probably by a combination of increased oxygen carrying capacity of the blood and lung diffusion, the latter being predominantly due to an increased capillary blood volume.JOURNAL ARTICLESCOPUS: ar.jinfo:eu-repo/semantics/publishe