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Daily rhythms of 25 physiological variables in Bos Taurus, maintained under natural conditions

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Author(s): Claudia Giannetto | Giuseppe Piccione

Journal: Journal of Applied Biomedicine
ISSN 1214-021X

Volume: 7;
Issue: 1;
Start page: 55;
Date: 2009;
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Keywords: cow | daily rhythms | blood parameters | physiological parameters | locomotor activity

ABSTRACT
To further understanding of the multiple temporal relationships of the physiological process, we monitoredsimultaneously 25 different variables in individual cows. We used 6 Bruna Italiana non – pregnant and non –lactating cows from the same farm. The animals were housed individually in a 12 m2 box under natural 14/10light/dark cycle. They were fed twice daily and water was available ad libitum. Locomotor activity and heartrate were recorded continuously. The rectal temperature, respiratory rate and blood samples were recordedevery 4 hours for 24 consecutive hours. To describe the periodic phenomenon analytically we applied atrigonometric statistical model according to the single cosinor procedure. Twelve of the 25 variables studiedshowed a daily rhythm: locomotor activity, rectal temperature, respiratory rate, haemoglobin, glucose,creatinine, urea, total cholesterol, total lipids, non-esterified fatty acid (NEFA), phosphorus and magnesium.Our results contribute to the understanding of the capacity for reaction and adaptation of animals to theenvironment, and to the improvement in their output by intervention in their environmental circumstances andin the breeding process.
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