The effectiveness of cholecalciferol and flumethasone for the prevention of hypocalcemic parturient paresis in dairy cows]

Investigations on the efficacy of high doses of cholecalciferol and flumethasone for prophylaxis of hypocalcemic milk fever were performed in dairy cows. Only one cow in the group of 25 treated animals diseased by milk fever, but 5 of 25 control animals showed signs of hypocalcemia. A placenta retention was observed in three treated animals and in four control animals. The results show that the additional application of flumethasone for birth induction after the injection of vitamin D3 was unchanged.     

Efficacy of oral calcium and/or sodium phosphate in the prevention of parturient paresis in cows

The goal of this study was to investigate the efficacy of calcium chloride, sodium phosphate or a combination of these two substances administered orally immediately postpartum for the prevention of parturient paresis in cows. Thirty-two cows that had had parturient paresis at the previous calving, and in which serum biochemistry had shown hypocalcaemia and hypophosphataemia, were used in the study. The cows were transferred to the Department of Farm Animals, University of Zurich, five days before their expected due dates. On a randomized trial, the cows were given calcium chloride, sodium phosphate, both substances or no treatment (controls) via a stomach tube immediately postpartum and 12 hours later. The cows were monitored for 96 hours during which time blood was collected on a regular basis for the determination of total calcium, ionized calcium, inorganic phosphorus and magnesium concentrations. Of the 32 cows treated, 19 (59%) had parturient paresis and 13 (41%) did not. The incidence of parturient paresis did not differ significantly among the groups although there was a tendency for a lower incidence in cows treated with both calcium chloride and sodium phosphate. The various treatments had no apparent effect on serum calcium concentration. The concentration of inorganic phosphorus increased significantly in cows treated with sodium phosphate compared with the controls. The results of this study showed that cows treated with both calcium chloride and sodium phosphate orally tended to have a lower incidence of parturient paresis. Further investigation into multiple administrations of oral calcium chloride and sodium phosphate, started before parturition, for the prevention of parturient paresis is required.     

奶牛产后瘫痪的综合疗法及病因浅析

奶牛产后瘫痪是母牛分娩后突然发生的一种营养代谢性疾病 ,以昏睡和四肢瘫痪为主要特征。常发生于产后 3ｄ内 ,少数发生于分娩过程中或产前。以 3～ 6胎 ( 5～ 9岁 )的高产奶牛最易发生。如治疗不及时 ,多数会因虚脱、瘤胃臌气或吸入性肺炎造成窒息而死亡。本病在奶牛较集中的吴忠市利通区比较多见。根据笔者近 6年来 89例的治疗资料统计 ,产后瘫痪病例占临床病例的8 3%。笔者近年来先后采用以单纯补钙为主的补钙疗法 (以下简称补钙疗法 )和先行乳房送风后以补钙、磷、镁、钾为主的综合疗法(以下简称综合疗法 )治疗该病 ,综合疗法获得了较好…     

Effect of intravenous calcium and oral sodium phosphate in cows with parturient paresis

The goal of this study was to determine whether oral administration of sodium phosphate in conjunction with intravenous calcium is more efficaceous than intravenous calcium alone for the treatment of parturient paresis. Thirty cows with parturient paresis were examined and treated by the same veterinarian. The cows were divided randomly into two groups of 15 cows each. Cows in group A received 500 ml of a 40 per cent calcium borogluconate solution containing 15.65 g calcium gluconate and borogluconate, with a supplement of 6 per cent magnesium hypophosphite (9.85 g magnesium hypophosphite) intravenously over a period of approximately 15 min. Cows in group B received the same treatment as well as 350 g of monobasic sodium phosphate (70 g inorganic phosphate, NaH2PO4 2 H2O, Streuli) dissolved in 0.5 litres of distilled water orally via a stomach tube. After treatment, the heart rate, respiratory rate, rectal temperature, superficial body temperature, rumen motility, appetite and defecation of the cows were monitored every hour for eight h. The cows' attempts to rise and their ability to stand were also noted. Initially, the results of clinical examination and serum electrolyte analyses did not differ between the two groups of cows.Within one hour of treatment, stupor was not observed in any of the cows. The general demeanour after treatment did not differ significantly between the two groups. In both groups, the average rectal temperature increased within two hours of the initiation of treatment, from 38.0 +/- 0.95 degrees C to 38.5 +/- 0.40 degrees C. There was no significant difference in the recovery rate between the groups. Of the 30 cows, 22 (73.3 per cent) stood within eight hours of treatment (10 cows from group A and 12 cows from group B). The type of treatment did not affect the time required to stand: cows in group A stood within 47.3 +/- 44 minutes and cows in group B stood within 24.2 +/- 32 minutes after the start of treatment. Our findings do not support the hypothesis that oral treatment with 350 g of sodium phosphate together with intravenous infusion of calcium in cows with parturient paresis results in an improved outcome, even though all the cows had hypophosphataemia as well as hypocalcaemia.     

Studies on the neuromuscular junction with a special preference to nicotinic receptors in normal delivering cows and cows suffering from parturient paresis

Acetylcholine synthesizing (ACh-s) activity, and binding of ³H--bungarotoxin (³H-Btx) and ³H-d-tubocurarine (³H-TC) were analysed in gluteus media muscle from normal cows and from cows suffering from parturient paresis, both at parturition and 3 months later. At parturition, the ACh-s activity was 50% lower in the muscle of paretic cows than in non-paretic cows. No difference was found in the number of ³H-Btx and ³H-TC binding sites at parturition, while 3 months after parturition the numbers of ³H-TC and ³H-Btx binding sites were significantly higher in normal than in paretic cows. These significant differences in the number of receptors and a possible underlying receptor regulation defect might be a plausible etiological factor for the disease parturient paresis.     

IgG from cows with parturient paresis changes the thermodynamic behaviour of bovine erythrocyte acetylcholinesterase

Parturient paresis affects about 10% of all cows. The most common treatment is injection of various Ca-salts and MgCl2 and about 80% recover after repeated injections. The effect of IgG on the Arrhenius plot of bovine erythrocyte AChE was studied. The plot was normal, i.e. biphasic (a broken line) in the presence of IgG from healthy cows. The highest concentration tested was 10 mg/ml. Before one injection of the Ca-Mg solution 5 mg/ml IgG from sera of paretic cows (n = 10) changed the Arrhenius plots to monophasic (linear). Thus, paretic cows have antibodies against AChE. After injection the change to linear plots was observed already with 1 mg/ml IgG. Apparently, the level of antibodies in serum affecting AChE increased about 5-fold. This is considered to be due to dissociation of bound antibodies from various AChEs. All cows recovered after one injection and release of AChE antibodies might be important for the recovery. Incubation of blood from paretic cows (n = 3) with Ca-salts and MgCl2 increased the amount of free AChE-antibodies about twofold; the Arrhenius plots became linear at 2.5 mg/ml IgG compared with 5 mg/ml before the incubation. This should be due to release from AChEs on blood corpuscles as erythrocytes and lymphocytes. But the increase of antibodies after incubation of blood does not account for the whole increase following the treatment of paretic cows. AChE antibodies are probably also dissociated from other sites, such as neuromuscular junctions.