Open AccessJournal Article
Reference values of blood parameters in beef cattle of different ages and stages of lactation.
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TLDR
The values reported, based on a wide age range and large number of cattle, could serve as clinical guides and a basis for further research.Abstract:
Reference (normal) values for 12 blood serum components were determined for 48 Shorthorn cows (2-10 years old) and their 48 calves, 357 crossbred cows (12-14 years old), 36 feedlot bulls and 36 feedlot steers. In addition, hemoglobin, hematocrit, triiodothyronine, thyroxine and cortisol levels were determined for the crossbred cows, and feedlot bulls and steers. Reference values were tabulated according to sex, age and stage of lactation. Serum concentrations of urea, total protein and bilirubin, and serum activity of aspartate aminotransferase and lactate dehydrogenase increased with age (P less than 0.05), while calcium, phosphorus and alkaline phosphatase decreased with age (P less than 0.05) from birth to the age of ten years. The Shorthorn cows had the highest levels of glucose at parturition (P less than 0.05) with decreasing levels during lactation. Creatinine concentration decreased during lactation and increased during postweaning. Both lactate dehydrogenase and aspartate aminotransferase levels increased (P less than 0.05) during lactation. Urea and uric acid were present at higher concentrations in lactating than nonlactating cows (P less than 0.05). The values reported, based on a wide age range and large number of cattle, could serve as clinical guides and a basis for further research.read more
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References
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Journal Article
On establishing reference values.
J H Lumsden,K Mullen +1 more
TL;DR: In order to establish a range of reference values for any characteristic one can use Gaussian or nonparametric techniques, whichever are most appropriate, and the same precision can be obtained with smaller sample sizes than using the non parametric techniques.
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Hormone and metabolite differences between lactating beef and dairy cattle.
TL;DR: Hourly blood samples were taken throughout a 24h (metabolites) or 48h (hormones) period from three lactating beef and three dairy cows which had been matched for age, stage of lactation and diet.
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Repeatabilities of Serum Constituents in Holstein-Friesians Affected by Feeding, Age, Lactation, and Pregnancy
R.G. Peterson,D.E. Waldern +1 more
TL;DR: Variances among and within cows were not consistent across physiological stages providing different repeatabilities for each stage, and alkaline phosphatase and creatinine had consistently high repeatabilities.
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Nutritional status of dairy cows indicated by analysis of blood.
TL;DR: The results suggest that the normal distribution should not be assumed for blood variables: instead it should be tested and regression analysis may help in selection of blood measurements for inclusion in profiles.
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Metabolic Profiles in Virginia Dairy Herds of Different Milk Yields
TL;DR: Differences among treatment means were significant between high and low producing herds and little between profiles for milking and pregnant nonlactating cows, and metabolic profiles of problem herds remained within normal ranges for all herds except one.