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1

Age related changes and reference intervals of haematological variables in dairy calves

100%
Jezek J., Nemec M., Staric J., Klinkon M.
Bulletin of the Veterinary Institute in Puławy
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2011
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tom 55
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nr 3
The aim of the study was to investigate the physiological pattern of haematological variables and to acquire reference intervals for calves in different age periods. Sixty-five Holstein Friesian calves from two dairy farms were serially sampled from birth to the age of 24 weeks. Red blood cell count (RBC), haemoglobin concentration (Hb), mean corpuscular volume (MCV), haematocrit (PCV), mean corpuscular haemoglobin (MCH), mean corpuscular haemoglobin concentration (MCHC), number of platelets (PLT), and white blood cell count (WBC) were measured in blood samples. The health status of the calves was monitored. The age influenced significantly the values of all haematological variables (P<0.001). The effect of farm was significant for RBC (P=0.048) and MCHC (P<0.001), other variables did not differ significantly between farms. The temporal dynamics of RBC, Hb, and PCV values was harmonised. A progressive reduction in the values occurred over the first weeks of life; the lowest values were established at the age of 5 to 6 weeks. The reference intervals of haematological variables were calculated for three age groups of calves; 1-4 weeks, 5-8 weeks, and 12-24 weeks of age.
2

Effects of haematophagous mites on nestling house sparrows [Passer domesticus]

100%
Szabo K., Szalmas A., Liker A., Barta Z.
Acta Parasitologica
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2002
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tom 47
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nr 4
Haematophagous mites are frequently found on nestling house sparrows (Passer domesticus), but their effects are poorly known. In this study we investigated whether natural levels of infection by two mite species Pellonyssus reedi and Ornithonyssus sylviarum have any fitness consequences on their hosts, including some physiological indices of chick health, body condition and fledging success. Among the haematological variables, thrombocytes and heterophils, but not lymphocytes and eosinophil granulocytes showed positive correlations with mite loads. There was also a significant decrease in the haematocrit values of the nestling sparrows with increasing mite intensity. We found no significant effect of ectoparasites on short- term indices of nestling fitness, such as body mass or fledging success. These results suggest that the blood-feeding mites of the studied house sparrow population mainly affected the haematological parameters of their hosts: They generated a non-specific immune response, with inflammatory processes and anaemia. On the other hand, parasite infestation seemingly has only weak influence on feather and skeletal growth of nestling sparrows, and no effect on fledging success and body mass.
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