Twenty-four 35-day-old lambs were distributed to a completely randomized design with 3 treatments to study the effects of number of feeding buckets per pen on performance, haematology and behaviour indicators. Treatments consisted of 8 (T1), 4 (T2) or 2 (T3) feeding buckets/pen (8 lambs/pen). During the experiment, concentrate was fed at 08:30 in individual feeders. Daily dry matter intake (DMI...

castration of male animal's leads to a reduction in aggressive behavior, which animals will avoid wasting energy resulting to economic production of the animal, grows. it also reduces damage and bruising animals and increases normed meat producing at slaughter. in this study, 20 lambs ghezel breed in four age groups, group 1: one month (n = 4), group 2: two months (n = 4) group 3: three months ...

BACKGROUND It remains a great challenge to measure systemic blood flow in critically ill newborns. In a former study we validated the modified carbon dioxide Fick (mCO(2)F) method for measurement of cardiac output in a newborn lamb model. In this new study we studied the influence of a left-to-right shunt on the accuracy of the mCO(2)F method. OBJECTIVE To analyze the influence of a left-to-r...

A BRANCH of physiology which has recently had much attention is fcetal physiology. In choosing to start with the fcetus, then, it is because it is convenient to do so, though I cannot deny that I am proud to say that the work formed the subject of the John Mallet Purser Lecture, Trinity College, Dublin, given last year by my father.l The foetuses used for the investigations were lambs or kids o...

This study examines the role of phosphate metabolites in the regulation of mitochondrial oxygen consumption of the heart in vivo as a function of development. We used an open chest lamb/sheep preparation in which myocardial oxygen consumption (MVO2) was monitored via an extracorporeal shunt from the coronary sinus. Phosphate metabolites were monitored simultaneously using 31P nuclear magnetic r...

Although the lungs and pericardium constrain the heart and limit cardiac output, no method exists to assess this constraint in sick newborns. We hypothesize that a useful estimate of ventricular constraint may be obtained by measuring right atrial pressure (P(RA)) in the newborn. To test this hypothesis, we measured P(RA), thoracic inferior vena caval pressure (P(IVC); saline-filled catheters),...

To study the effect of alveolar hypoxia on the pulmonary circulation of the newborn, we determined the longitudinal distribution of vascular pressures and the distribution of blood flow in isolated blood perfused lungs of newborn lambs during normoxia and hypoxia. We also examined the effect of hypoxia on the slope and intercept of the vascular pressure-flow (P/Q) relation. In 14 lungs, we used...

No information is available on perinatal changes in myocardial metabolism in vivo. We measured myocardial supply and flux of fatty acids, carbohydrates, and ketone bodies in chronically instrumented fetal, newborn (1-4 days), and juvenile (7 wk) lambs, by measuring aorta-coronary sinus concentration differences and blood flow. In the fetal lambs, myocardial supply and flux of fatty acids were z...