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Báo cáo khoa học: " Effect of Anionic Salt and Highly Fermentable Carbohydrate Supplementations on Urine pH and on Experimentally Induced Hypocalcaemia in Cows"

Tuyển tập các báo cáo nghiên cứu về bệnh thú y được đăng trên tạp chí y học General Psychiatry cung cấp cho các bạn kiến thức về ngành thú y đề tài: Effect of Anionic Salt and Highly Fermentable Carbohydrate Supplementations on Urine pH and on Experimentally Induced Hypocalcaemia in Cows. | Acta vet. scand. 2004 45 139-147. Effect of Anionic Salt and Highly Fermentable Carbohydrate Supplementations on Urine pH and on Experimentally Induced Hypocalcaemia in Cows By L. S. B. Mellau1 R. J. Jargensen1 P C. Bartlett J. M. D. Enemark1 and A. K. Hansen2 1Cattle Production Medicine Research Group Department of Large Animal Sciences and 2Section for Experimental Animals The Royal Veterinary and Agricultural University Denmark College of Veterinary Medicine Michigan State University East Lansing USA. Mellau LSB Jorgensen RJ Bartlett PC Enemark JMD Hansen AK Effect of anionic salt and highly fermentable carbohydrate supplementations on urine pH and on experimentally induced hypocalcaemia in cows. Acta vet. scand. 2004 45 139147. - The objective of this experiment was to determine the effect of dietary grain on calcium homeostasis. Six rumen-fistulated dairy cows with 3 or more previous lactations and no history of parturient paresis were randomly assigned to a sequence of diets in a crossover study with 4 periods of 10 days each. Dietary treatments were A control ration consisting of wrap grass silage alone 1 the control ration supplemented with ammonium chloride and ammonium sulphate salt solution 2 control ration following a period with supplementation 3 and control ration supplemented with increasing amounts of barley from 4 to 10 kg cow per day expected to produce subclinical rumen acidosis 4 . Daily intake of the diets was adjusted to 14 kg DM cow per day. On day 11 the calcium-regulating mechanisms in cows were challenged until recumbency by a standardized intravenous EDTA infusion and cows were left to recover spontaneously. Anion supplementation and the feeding of highly fermentable carbohydrate lowered urine pH below 7.0 due to subclinical acidosis. During spontaneous recovery from EDTA induced hypocalcaemia the cows more quickly regained a whole blood free calcium concentration of 1.00 mmol L if they had most recently been supplemented with either .