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Lymphocyte functions in dairy cows in hot environment

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Abstract

This study was carried out to ascertain the effects of intense high environmental temperatures (HET) on lymphocyte functions in periparturient dairy cows. The study was undertaken from the beginning of March through the end of July 2003 in a commercial dairy unit located approximately 40 km north of Rome. Thirty-four Holstein cows were utilised in the study. Twenty-two of these cows gave birth in spring (SP cows), from 28 March to 30 April. The remaining 12 cows gave birth in summer (SU cows), between 15 June and 2 July. The two groups of cows were balanced for parity and were fed the same rations. Blood samples were taken 4, 3, 2 and 1 week before calving, and 1, 2 and 4 weeks after calving, in order to evaluate peripheral blood mononuclear cell (PBMC) function in vitro, and to determine plasma cortisol concentrations. After isolation, the PBMC were stimulated with mitogens and their response in terms of DNA synthesis and IgM secretion was measured. During spring, either the day (9–20 h) or the night (21–8 h) temperature humidity index (THI) was below the upper critical THI (72) established for dairy cows. During summer, the mean daily THI values were 79.5±2.9 during the day and 70.1±4.7 during the night. Furthermore, during summer, three heat waves (a period of at least 3 consecutive days during which there were less than 10 recovery hours) occurred. Recovery hours were intended hours with a THI below 72. The first heat wave lasted 5 days, the second 6 days, and the third 15 days. Compared to the SP cows, over the entire periparturient period the extent of DNA synthesis and IgM secretion levels were lower (P ranging from <0.01 to 0.0001) and higher (P<0.01) respectively, in the SU cows. Before calving, the SU cows also presented higher (P<0.01) concentrations of plasma cortisol compared to the SP cows. This study indicates that the effects of HET on the immune response depend on the specific immune function under consideration, and that neuroendocrinal changes due to HET may play a role in the perturbation of immune functions.

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Acknowledgements

This study was financially co-supported by MIUR (PRIN 03 and Special Project FIRB) and Università degli Studi della Tuscia. The authors gratefully acknowledge C. Armeni, C. Bruti, M. Guida, A. Morales and D. Pirazzi for technical help. The study complies with current Italian laws.

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  1. Dipartimento di Produzioni Animali, Università degli Studi della Tuscia, Via San Camillo de Lellis, 01100, Viterbo, Italy

    Nicola Lacetera, Umberto Bernabucci, Daniela Scalia, Bruno Ronchi, Giorgina Kuzminsky & Alessandro Nardone

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  1. Nicola Lacetera
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  2. Umberto Bernabucci
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  3. Daniela Scalia
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  4. Bruno Ronchi
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  5. Giorgina Kuzminsky
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  6. Alessandro Nardone
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Correspondence to Nicola Lacetera.

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Lacetera, N., Bernabucci, U., Scalia, D. et al. Lymphocyte functions in dairy cows in hot environment. Int J Biometeorol 50, 105–110 (2005). https://doi.org/10.1007/s00484-005-0273-3

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  • DOI: https://doi.org/10.1007/s00484-005-0273-3

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