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August 7, 2026Journal of Applied Animal ResearchOpen Access

Environmental and physiological determinants of somatic cell count and clinical mastitis in primiparous Holstein cows

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Authors

MTMahdi Elahi TorshiziMMMojtaba Hosseinpour MashhadiMGMostafa Ghaderi‐Zefrehei

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Overview

Randomized trial evaluates factors affecting somatic cell count and mastitis in Holstein cows, suggesting milk yield implications.

Key Points

  • The aim was to evaluate the resistance to somatic cell count and clinical mastitis in Holstein dairy cattle.
  • Analyzed data from 45,316 primiparous Holstein cows across 1026 herds between 2002 and 2018.
  • Evaluated factors affecting somatic cell scores and lactation curves fitted by the incomplete gamma function.
  • Highest somatic cell scores were observed in spring and winter (2.95 vs. 2.94, p < 0.001).
  • Significant reduction in somatic cell scores annually by 13,000 cells/year, with first calving at 23-24 months yielding the lowest scores.
  • Cows with clinical mastitis had 305-day milk yield reductions exceeding 500 kg compared to healthy cows.

Cite This Study

Torshizi et al. (2026) studied this question.

synapsesocial.com/papers/6a758bef847ab6d26c01f90ehttps://doi.org/10.1080/09712119.2026.2714209
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Also Consider

Synapse has enriched 5 closely related papers on similar clinical questions. Consider them for comparative context:

  1. 1The relationship of somatic cell count with milk yield and composition in different stages of lactation in Holstein cows2024 · 2 citations
  2. 2Somatic Cell Count Evaluation in Early Lactation Betweenprimiparous and Multiparous Bos indicus Cows (SDG'S)2024 · 2 citations
  3. 3The variability in the prevalence of subclinical and clinical mastitis and its impact on milk yield of Holstein and Simmental cows as a result of parity2024 · 3 citations
  4. 4Genetic parameters for clinical mastitis and somatic cell count for the Nordic dairy cattle populations2026
  5. 5Somatic Cell Count Evaluation in Early Lactation between Primiparous and Multiparous Bos indicus Cows2024