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2002, vol. 18, iss. 1-2, pp. 11-16
Influence of the environmental temperature and humidity regime during winter over some adaptive reactions of calves
National Centre for Agricultural Sciences, Institute of Animal Science, Kostinbrod, Republic of Bulgaria
Abstract
The current study aims to examine the influence of the environmental temperature and humidity regime during winter on some adaptive reactions in the organism of five-month-old calves of the Bulgarian Black and White breed, kept in O.K. and in cattle-shed in Bulgaria. The temperature and the relative humidity of the production environment have been studied for a period of three months. The changes in the length, weight, density and percent ratio of the coat, transitional and prickly hairs and the changes in the hemoglobin (HBB), haematocrit (PCV), the inorganic phosphorus (P) and the number of erythrocytes (Er) were examined. The hair and blood tests were taken once at the end of the winter when the calves were five months old. 30 animals divided in two groups of 15 were studied. After the results were analyzed it became clear that the abiotic factors - low temperature and increased humidity of the environment - are main preconditions for the increase of the coat hairs from 11.8 % of the calves kept in the hutch to 26.2 % of the calves kept in O.K.. their length (from 24.395 mm to 29.941 mm), density (from 3567.3 n 4cm2 to 5423.8 n/4cm2) and weight (from 7.629 mg/cm2 to 15.466 mg/cm2). The level of hemoglobin HBB (from 5.23 mmol/1 to 5.48 mmol/1), haematocrit PCV (from 0.33 1/1 to 0.351/1) and the number of erythrocytes Er (from 8.6x10l2/l to 8.8x 10l2/l) raised, while the level of inorganic phosphorus P fell (from 4.92 mmol/1 to 4.71 mmol/1).
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article language: English
document type: Original Scientific Paper
DOI: 10.2298/BAH0202011K
published in SCIndeks: 10/11/2009

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