Clinical indicators of blood gas disturbances, elevated L-lactate concentration and other abnormal blood parameters in newborn beef calves.

Autor: Homerosky ER; Department of Production Animal Health, University of Calgary Faculty of Veterinary Medicine, 3330 Hospital Dr. NW, Calgary, AB T2N 4N1, Canada., Caulkett NA; Department of Veterinary Clinical and Diagnostic Sciences, University of Calgary Faculty of Veterinary Medicine, 3330 Hospital Dr. NW, Calgary, AB T2N 4N1, Canada., Timsit E; Department of Production Animal Health, University of Calgary Faculty of Veterinary Medicine, 3330 Hospital Dr. NW, Calgary, AB T2N 4N1, Canada., Pajor EA; Department of Production Animal Health, University of Calgary Faculty of Veterinary Medicine, 3330 Hospital Dr. NW, Calgary, AB T2N 4N1, Canada., Kastelic JP; Department of Production Animal Health, University of Calgary Faculty of Veterinary Medicine, 3330 Hospital Dr. NW, Calgary, AB T2N 4N1, Canada., Windeyer MC; Department of Production Animal Health, University of Calgary Faculty of Veterinary Medicine, 3330 Hospital Dr. NW, Calgary, AB T2N 4N1, Canada. Electronic address: c.windeyer@ucalgary.ca.
Jazyk: angličtina
Zdroj: Veterinary journal (London, England : 1997) [Vet J] 2017 Jan; Vol. 219, pp. 49-57. Date of Electronic Publication: 2016 Dec 06.
DOI: 10.1016/j.tvjl.2016.12.001
Abstrakt: Blood gas disturbances, commonly resulting from dystocia, are associated with failed transfer of passive immunity, morbidity and mortality in newborn calves. Modified APGAR scores intended to identify compromised calves are not widely adopted due to lack of practicality and inconsistent associations with blood parameters. The objective of this study was to determine clinical indicators of acidemia in newborn beef calves. Blood parameters at 10 min and 24 h after birth were compared to at-birth clinical examination parameters and calving characteristics in 77 commercial beef calves. There were no associations between heart rate or respiratory rate and blood pH or blood L-lactate concentration (LAC; r < 0.25); however, LAC was highly correlated with blood pH (r, -0.86). Abnormal mucous membrane color (red, white or blue) was associated with increased LAC (P = 0.002) but not decreased blood pH (P = 0.07). Abnormal results for tests of muscle tonicity and reflexes, namely inability to completely withdraw the tongue when pinched and a weak suckle reflex, were associated with decreased blood pH and increased LAC (P <0.05). Calves born to primiparous dams or from an assisted calving also had decreased blood pH and increased LAC (P <0.05). Differences in blood pH between at-birth categories resolved for all parameters by 24 h after birth, except for tongue withdrawal (P= 0.04). In conclusion, traditional APGAR parameters, heart rate, respiratory rate and mucous membrane color were not useful for the identification of acidemic calves; however, tongue withdrawal, calving ease, and parity should be included in such an assessment. Utilizing hand-held LAC meters may be a practical method to quickly identify compromised calves with acidemia in a field setting.
(Copyright © 2016 Elsevier Ltd. All rights reserved.)
Databáze: MEDLINE
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