References of "Rollin, Frédéric"
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See detailDoppler echocardiographic measurement of cardiac output in the calf: a preliminary study
Amory, Hélène ULiege; Sandersen, Charlotte ULiege; Brihoum, M et al

in Proceedings of the World Assoc. Buiatrics Congress (2000)

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See detailVery Low Surfactant Protein C Contents in Newborn Belgian White and Blue Calves with Respiratory Distress Syndrome
Danlois, F.; Zaltash, S.; Johansson, J. et al

in Biochemical Journal (2000), 351(Pt 3), 779-87

We have studied a respiratory distress syndrome (RDS) occurring in newborn calves of the Belgian White and Blue (BWB) breed that represents the large majority of beef cattle in Belgium. Pulmonary ... [more ▼]

We have studied a respiratory distress syndrome (RDS) occurring in newborn calves of the Belgian White and Blue (BWB) breed that represents the large majority of beef cattle in Belgium. Pulmonary surfactant isolated from 14 BWB newborn calves that died from RDS and from 7 healthy controls was analysed for composition and surface activity. An extremely low content or, in some instances, an absence of surfactant protein C (SP-C) was detected in the RDS samples by Western blotting and differential amino acid analysis [0.03+/-0.01% (w/w) relative to total phospholipids, compared with 0.39+/-0.06% for healthy controls (means+/-S.E.M., P < 0.001)]. The contents of surfactant protein B (SP-B) were similar in RDS and control samples. The crude surfactant samples isolated from RDS calves had higher ratios of total protein to total phospholipid, altered phospholipid profiles and lower SP-A contents. Both crude and organic extracts of RDS surfactant samples showed increased dynamic surface tension compared with healthy controls when evaluated with a pulsating-bubble surfactometer. The addition of purified SP-C to organic extracts of RDS surfactant samples lowered surface tension. Strongly decreased levels of mature SP-C associated with fatal RDS and altered surface activity in vitro have, to the best of our knowledge, not been previously reported. The mechanisms underlying RDS and the decrease in SP-C in BWB calves remain to be established. [less ▲]

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See detailMolecular and Clinicopathological Diagnosis of Non-Wildebeest Associated Malignant Catarrhal Fever in Belgium
Desmecht, Daniel ULiege; Cassart, Dominique ULiege; Rollin, Frédéric ULiege et al

in Veterinary Record : Journal of the British Veterinary Association (1999), 144(14), 388

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See detailImpact of different environmental managements on spatial distribution of ventilation in COPD horses
Vandenput, Sandrina ULiege; Rollin, Frédéric ULiege; Votion, Dominique ULiege et al

in Plügers Archives European Journal of Physiology (1998)

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See detailDifferential diagnosis of tachypnea in newborn calves : a field study
Rollin, Frédéric ULiege; Dardenne, A; Danlois, F et al

in In Proceedings of the World Assoc. Buiatrics Congress (1998)

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See detailPulmonary Function Values in Friesian and Double-Muscled Calves During Acute Poikilocapnic Hypoxia
Rollin, Frédéric ULiege; Amory, Hélène ULiege; Desmecht, Daniel ULiege et al

in Zentralblatt für Veterinarmedizin. Reihe A (1997), 44(2), 79-90

The effects of an acute non-isocapnic hypoxia on ventilation and pulmonary mechanics were investigated in 6 healthy unsedated Holstein-Friesian (HF) calves and in 7 double-muscled calves of the Belgian ... [more ▼]

The effects of an acute non-isocapnic hypoxia on ventilation and pulmonary mechanics were investigated in 6 healthy unsedated Holstein-Friesian (HF) calves and in 7 double-muscled calves of the Belgian White and Blue (BWB) breed known to develop more severe hypoxemia during exercise and respiratory diseases. Data were collected at 1 min intervals throughout the following protocol: breathing air (FIO2 = 21%), then breathing hypoxic gas mixture (FIO2 = 10%) for 5 min, and, finally, breathing air again for 5 min of recovery. Arterial blood was sampled at rest and at the 4th min of hypoxia for blood gas analysis. In HF and BWB calves, hypoxia induced a significant increase in tidal and minute volume, but did not change respiratory rate, dynamic lung compliance and total pulmonary resistance. However, with regard to their ventilation during normoxia at rest, BWB calves showed a comparatively greater rise in ventilation than HF calves during the first 4 min of hypoxia. On the contrary, by the 5th minute of hypoxia, ventilation of BWB calves declined to the normoxic level while HF calves largely sustained hyperventilation. This hypoxic ventilatory depression in BWB calves could be explained by the proportionately greater initial increase in ventilation. It was concluded that BWB calves supported this hypoxic challenge less easily than HF calves. [less ▲]

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See detailVentilatory Effects of the Single-Breath Co2 Test, Compared with Eructation, in Cattle
Rollin, Frédéric ULiege; Desmecht, Daniel ULiege; Genicot, B. et al

in American Journal of Veterinary Research (1997), 58(3), 310-6

OBJECTIVE: To assess the peripheral chemoreceptor-induced ventilatory response to single tidal-breath CO2 (SB CO2) tests, compared with eructations, in 2 breeds of calves. ANIMALS: 13 conscious unsedated ... [more ▼]

OBJECTIVE: To assess the peripheral chemoreceptor-induced ventilatory response to single tidal-breath CO2 (SB CO2) tests, compared with eructations, in 2 breeds of calves. ANIMALS: 13 conscious unsedated Holstein-Friesian and 8 Belgian White and Blue hypermuscled calves. PROCEDURE: An SB of +/- 50% CO2 in equal parts of O2 and N2 was inhaled. Ventilatory response was determined from the increase in ventilation (delta Ve) during the first 20 seconds after the test breath or eructation and from the difference in end-tidal PCO2 between the stimulus and preceding control breaths. RESULTS: Because no difference was found between the 2 breeds of calves, all data were pooled. The increase in Ve peaked during the fifth breath after the SB CO2 test on average, corresponding to a delay of 12.4 seconds. The SB CO2 responses ranged from 0.037 to 0.151 L/min.mm of Hg.m2, with a mean +/- SD of 0.082 +/- 0.032 L/min.mm of Hg.m2 for all calves. The SB CO2 tests, similar to eructations, modified the breathing pattern significantly and in the same direction, by principally shortening expiratory time and increasing mean inspiratory flow. After eructations, Ve peak increase was more important for lower difference in end-tidal PCO2 between the stimulus and preceding control breaths and took place more rapidly than after SB CO2 tests. Accordingly, eructation responses were more marked than SB CO2 responses and averaged 0.925 +/- 0.276 L/min.mm of Hg.m2. CONCLUSIONS AND CLINICAL RELEVANCE: In cattle, the pattern of breathing and ventilation under basal conditions is characterized by a cyclic variability coupled to eructation. [less ▲]

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See detailA new acute respiratory distress syndrome in newborn calves : clinical, laboratory and post-mortem findings
Dardenne, A; Danlois, F; Rollin, Frédéric ULiege et al

in In Proceedings of the 15th Comparative Respiratory Society Meeting (1997)

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See detailThe Effects of Hypertonic Saline in Healthy and Diseased Animals
Cambier, Carole ULiege; Ratz, V.; Rollin, Frédéric ULiege et al

in Veterinary Research Communications (1997), 21(5), 303-316

In this review, the pharmacological effects of administering hypertonic solutions to both healthy animals and during experimentally induced diseases are considered with a view to understanding the ... [more ▼]

In this review, the pharmacological effects of administering hypertonic solutions to both healthy animals and during experimentally induced diseases are considered with a view to understanding the mechanisms behind the possible clinical efficacy of such treatment. The review focuses successively on haemorrhagic shock, endotoxic shock and hypokalaemic metabolic alkalosis. How hypertonic saline solutions affect oxygen transport by haemoglobin is also considered. [less ▲]

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See detailEffects of Growth and Breed on Direct Static Measurements of Chest Wall Compliance in Cattle
Desmecht, Daniel ULiege; Rollin, Frédéric ULiege; Linden, Annick ULiege et al

in Research in Veterinary Science (1997), 62(1, Jan-Feb), 1-5

Chest wall compliance (CW) was measured in 59 conscious standing calves, aged six to 162 days, which were breathing air spontaneously through a face mask. The airways were occluded at the end of ... [more ▼]

Chest wall compliance (CW) was measured in 59 conscious standing calves, aged six to 162 days, which were breathing air spontaneously through a face mask. The airways were occluded at the end of inspiration in order to elicit the Hering-Breuer reflex, the effectiveness of which was ensured by the presence of a plateau on the tracings of airway opening and oesophageal pressure (Pes). CW was measured directly from the inspired volume of the occluded breath and changes in Pes generated by the recoil of the relaxed chest wall. This airway-occlusion technique yielded reproducible CW values similar to those measured by classical invasive methods. The ratio of CW to bodyweight in the growing calves (sCW) ranged from 2.2 to 11.5 ml cmH2O-1 kg-1 and was correlated negatively with age: (log sCW = 0.91-0.003 x age, r = 0.68), the rate of decline corresponding well to the multispecies allometric growth relationship. [less ▲]

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See detailFluidothérapie parentérale pratique chez les bovins
Rollin, Frédéric ULiege

in Annales de Médecine Vétérinaire (1997), 141(2), 89-111

After setting up the main indications for parenteral fluid therapy in calves and adult cattle, the means are studied to practically evaluate on the field the dehydration, acid-base status, electrolyte ... [more ▼]

After setting up the main indications for parenteral fluid therapy in calves and adult cattle, the means are studied to practically evaluate on the field the dehydration, acid-base status, electrolyte disturbances and glycemia. The various classes of fluids are then considered as a function of the indications. Use of transfusion, hypertonic solutions and parenteral nutrition is broached. Routes and techniques of fluid administration are detailed. Obstacles encountered by the bovine practitioner when using parenteral fluid therapy are emphasized just as the means to overcome them. In this regard, it is described how to correctly prepare fluids for suited parenteral use in cattle. In fact, the present laws do not given this allowance to the practitioners. However, in most cases, it constitutes the only economical option avoiding worthless sufferings and death of the animal. [less ▲]

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See detailMultiple-Breath Washout and Washin Experiments in Steers
Rollin, Frédéric ULiege; Desmecht, Daniel ULiege; Verbanck, S. et al

in Journal of Applied Physiology (Bethesda, Md. : 1985) (1996), 81(2), 957-63

Multiple-breath N2 washouts (WO) and washins (WI) were performed during regular tidal breathing in 11 unsedated healthy steers approaching pulmonary functional maturity (mean body weight = 271 kg). They ... [more ▼]

Multiple-breath N2 washouts (WO) and washins (WI) were performed during regular tidal breathing in 11 unsedated healthy steers approaching pulmonary functional maturity (mean body weight = 271 kg). They inspired 20% O2 in 80% Ar during the WO and air during the WI. For each steer, we computed two indexes of ventilation inhomogeneity from the N2 WO curves: 1) the curvilinearity of the logarithm of end-tidal N2 concentrations as a function of cumulative expired volume reflected in the ratio of two slopes fitted between 100 and 50% and between 50 and 10%, respectively, of end-tidal N2 concentration of the first breath of the WO; and 2) the N2 phase III slope divided by the mean expired concentration (Sn) of each breath also plotted as a function of cumulative expired volume. Equivalent computation of both parameters was done on WI and WO curves, and similar results were obtained. The mean slope ratio was 0.812 +/- 0.119 (SD) for all the steers, which is consistent with topographic gravity-dependent specific ventilation distribution inhomogeneity. Sn was independent of the breath number both for WO and WI (mean Sn = 0.130 +/- 0.057 liters-1), suggesting that emptying between unequally ventilated units, is synchronous. This behavior resembles that observed in rats postmortem (S. Verbanck, E.R. Weibel, and M. Paiva. J. Appl Physiol. 71: 847-854, 1991) but contrasts with experiments in humans, in whom convection-dependent ventilation inhomogeneities generate a marked increase in Sn throughout the entire WO (A. B. H. Crawford, M. Makowska, M. Paiva, and L. A. Engel. J. Appl. Physiol. 59: 838-846, 1985). This is surprising because one would expect gravity-dependent sequential emptying in animals of this size. [less ▲]

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See detailControl of breathing in healthy and pasteurella-exposed calves after 5-HT receptor blockade
Rollin, Frédéric ULiege; Close, R; Linden, Annick ULiege et al

in Proceedings of the XIXth World Association for Buiatrics Congress (1996)

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See detailComparison of Cardiac Function in Double-Muscled Calves and in Calves with Conventional Muscular Conformation
Amory, Hélène ULiege; Desmecht, Daniel ULiege; Linden, Annick ULiege et al

in American Journal of Veterinary Research (1994), 55(4), 561-6

During growth, central venous, right ventricular, pulmonary arterial, pulmonary capillary wedge, and systemic arterial pressures, heart rate, and cardiac output were repeatedly measured in 41 Friesian ... [more ▼]

During growth, central venous, right ventricular, pulmonary arterial, pulmonary capillary wedge, and systemic arterial pressures, heart rate, and cardiac output were repeatedly measured in 41 Friesian calves, considered as having conventional muscular conformation, and in 19 Belgian White and Blue double-muscled calves. A total of 123 and 70 recordings were collected in conventional and double-muscled calves, respectively. These circulatory indices were calculated: stroke volume, cardiac and stroke indices, pulmonary and systemic pulse pressures, pulmonary and systemic vascular resistance indices, and right and left ventricular work indices. Results indicated that systemic arterial and pulse pressures, as well as cardiac output, stroke volume, cardiac and stroke indices, and right and left ventricular work indices were significantly (P < or = 0.05 to 0.001) lower but, in contrast, pulmonary and systemic vascular resistance indices were significantly (P < or = 0.001) higher in double-muscled than in conventional calves. Right-sided vascular pressures and heart rate were similar in the 2 groups. These results indicated that global cardiac performance may be considerably poorer in double-muscled calves. Diminished cardiac performance of double-muscled calves appears to be related neither to relative bradycardia nor to reduced ventricular preload. The potential role of increased ventricular afterload or of reduced myocardial contractility in double-muscled cattle should be determined by direct measurements. [less ▲]

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See detailControl of breathing in unanesthetized healthy and Pasteurella-exposed calves after 5-HT2 receptor antagonism by metrenperone
Rollin, Frédéric ULiege; Close, A; Linden, Annick ULiege et al

in Proceedings of the XVIIIth World Buiatrics Congress (1994)

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See detailReduced cardiac functional capacity as a consequence of the double-muscled conformation selection in the Belgian White and Blue breed
Amory, Hélène ULiege; Desmecht, Daniel ULiege; Linden, Annick ULiege et al

in Proceedings of the XVIIIth World Buiatrics Congress, Bologna, Italy (1994)

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See detailEctopie cervicale du coeur chez un veau
Gabriel, Annick ULiege; Vandeputte, Sébastien ULiege; Rollin, Frédéric ULiege et al

in Annales de Médecine Vétérinaire (1994), 138

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See detail5-HT challenge in healthy vigile calves after MDL72222 pretreatment
Linden, Annick ULiege; Desmecht, Daniel ULiege; Rollin, Frédéric ULiege et al

in Pflügers Archiv : European Journal of Physiology (1994), 426

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See detailControl of breathing in healthy and Pasteurella exposed calves after 5-HT2 receptor blockade
Rollin, Frédéric ULiege; Close, Patricia ULiege; Linden, Annick ULiege et al

in Pflügers Archiv : European Journal of Physiology (1994), 426

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