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Assessment of thermal load on transported goats administered with ascorbic acid during the hot-dry conditions

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Abstract

The major factor in the induction of physiological stress during road transportation of livestock is the complex fluctuations of the thermal transport microenvironment, encountered when animals are transported across different ecological zones. Recommended guidelines on optimum “on-board” conditions in which goats should be transported are lacking, and there are no acceptable ranges and limits for the thermal loads to which goats may be subjected during long-distance road transportation in hot-dry conditions. Panting score (PS), rectal temperature (RT), heart rate (HR) and respiratory rate (RR) were employed as reliable stress indices to assess the effects of different thermal loads, measured as temperature humidity index (THI), encountered in the vehicle during 12 h of road transportation of 40 goats, and to suggest the administration of 100 mg/kg body weight of ascorbic acid (AA) as an ameliorating agent. The results obtained showed that the PS, RT, HR and RR rose above normal reference values with increase in the THI and journey duration. The rise in PS value, which is a visual indicator of the severity of thermal load, was the most pronounced. The results suggest that values of THI in the vehicle up to 94.6 constitute no risk, while at of 100 it presents a moderate risk and above 100 may result in severe stress. The relationships between the thermal load and the physiological variables were positive and significant (P < 0.05). They reflect the degree of stress imposed by each THI value during the transportation, and may be used as recommended ranges and limit thermal load values in transported goats. The results demonstrated that administration of 100 mg/kg body weight of AA before road transportation mitigated the risk of adverse effects of high THI values and other stress factors due to road transportation in goats.

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Acknowledgment

The authors are grateful to the Laboratory staff members of College of Agriculture and Animal Science, Mando-Kaduna, Nigeria.

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Authors and Affiliations

  1. College of Agriculture and Animal Science, P.M.B. 2134.Division of Agricultural Colleges, Ahmadu Bello University, Mando – Kaduna, Nigeria

    N. S. Minka

  2. Department of Physiology and Pharmacology, Faculty of Veterinary Medicine, Ahmadu Bello University, Zaria, Nigeria

    J. O. Ayo

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  1. N. S. Minka
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  2. J. O. Ayo
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Correspondence to N. S. Minka.

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Minka, N.S., Ayo, J.O. Assessment of thermal load on transported goats administered with ascorbic acid during the hot-dry conditions. Int J Biometeorol 56, 333–341 (2012). https://doi.org/10.1007/s00484-011-0437-2

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  • DOI: https://doi.org/10.1007/s00484-011-0437-2

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