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Seasonal variations of physiological responses, milk production, and fatty acid profile of local crossbred cows in Tunisia

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Abstract

The study investigates the seasonal variations of physiological responses, milk yield, milk composition, and milk fatty acid profile of local crossbred cows (Friesian × Brown Atlas) in northwestern Tunisia. A total of 80 multiparous cows from smallholder farmers were sampled between 2018 and 2019. The cows were feed the same diet ad libitum and exposed to the same Mediterranean climatic conditions. Weekly rectal temperature (RT; °C), respiratory rate (RR; rpm), and heart rate (HR; bpm) were measured per cow in each season. Individual milk yield and samples were recorded bi-weekly and collected in duplicate for chemical analyses. Milk fatty acids (FAs) were analyzed using gas chromatography-mass spectrometry (GC-MS). Results showed an increase (P < 0.05) in RT (+ 1.3%), RR (+ 12.1%), and HR (+ 9.9%) when the temperature-humidity index (THI) increased from winter (53.6) to summer (74.4) in response to heat stress. Milk yield did not vary significantly between seasons (8.3 L/day on average). Summer milk contained more fat (+ 7.8%) and log SCC (+ 13.7%). The proportion of the monounsaturated (31.2 vs. 27.2%) and polyunsaturated (4.29 vs. 3.86%) FAs decreased (P < 0.05) between winter and summer. Saturated FAs (64.5 vs. 67.7%) were higher (P < 0.05) in summer than in winter. Winter milk fat contained higher levels of C18:2cis-9 trans-11 (CLA) (0.73 vs. 0.56%) and ω-3 FA (0.83 vs. 0.63%), but a lower ω-6/ω-3 ratio (4.07 vs. 6.17%) compared to summer. As the cows were fed the same diet throughout the two seasons, the performances obtained were mainly due to the resistance of the local crossbred cow to the hot conditions. It is concluded that the local crossbred cow maintains its productivity and tolerate the hot Mediterranean climate.

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Data availability

The datasets generated and analyzed during the current study are available from the corresponding author on reasonable request.

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Funding

This research was supported by King Saud University, Riyadh, Saudi, State, Project No. RSPD20203R745.

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Authors and Affiliations

  1. Environment Biomonitoring Laboratory (LR01/ES14), Department of Life Sciences, Faculty of Sciences, University of Carthage, 7021, Bizerta, Zarzouna, Tunisia

    E. Brahmi, A. Souli, M. Ben-Attia & M. Ayadi

  2. Higher School of Agriculture of Kef, University of Jendouba, 7119, El Kef, Tunisia

    E. Brahmi

  3. Department of Animal Biotechnology, Higher Institute of Biotechnology of Beja, University of Jendouba, 9000, Beja, Tunisia

    A. Souli, M. Maroini & M. Ayadi

  4. Botany and Microbiology Department, College of Science, King Saud University, P.O. Box 22452, Riyadh, 11495, Saudi Arabia

    I. Abid

  5. Department of Animal and Food Sciences, Universitat Autònoma de Barcelona, Bellaterra, Spain

    A. A. K. Salama

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  1. E. Brahmi
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Contributions

E.B., M.A., and A.A.K.S. contributed to the study conception and design. M.M. and I.A. contributed to the formal analysis. Material preparation, data collection, and analysis were performed by E.B. The first draft of the manuscript was written by E.B. A.S., M.A., and A.A.K.S. commented on previous versions of the manuscript. All authors read and approved the final manuscript.

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Correspondence to E. Brahmi.

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This study was executed in accordance with the good practices and ethical rules of animal experimentation based on the Tunisian laws on well-being and good practices of livestock animals (N°2005-95). The manuscript does not contain clinical studies or patient data.

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Brahmi, E., Souli, A., Maroini, M. et al. Seasonal variations of physiological responses, milk production, and fatty acid profile of local crossbred cows in Tunisia. Trop Anim Health Prod 56, 11 (2024). https://doi.org/10.1007/s11250-023-03851-6

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