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<p>Lameness is a major welfare and economic challenge in dairy herds and is associated with reduced milk yield and compromised milk quality; however, evidence under tropical production systems such as Bangladesh remains limited. This observational study was conducted at a commercial dairy farm in Mymensingh, Bangladesh (July 2024-June 2025) to evaluate the effects of lameness on milk yield and inflammatory milk quality indicators. Sixteen Holstein-Friesian lactating cows were enrolled, including 12 clinically lame cows and 4 healthy controls. Lame cows were observed at three predefined stages: 7 days before clinical diagnosis, on the diagnostic day, and 7 days after diagnosis; healthy cows were sampled once as baseline references. Lameness was assessed using a standardized 1–5 locomotion scoring system. Milk yield was obtained from farm records, and milk quality traits, including pH, electrical conductivity, somatic cell count (SCC), fat, protein, lactose, solid-not-fat, and total solids, were analyzed using Ekomilk Horizon Unlimited. Multivariable linear mixed-effects models revealed a significant reduction in milk yield during lameness (15.0 +/- 0.6&#xa0;L/day) compared with pre-diagnosis values (19.0 +/- 0.5&#xa0;L/day; <i>p</i> &lt; 0.001), representing a 21% decline. SCC increased more than two-fold (812.8 +/- 45.6 × 10^3 cells/mL; <i>p</i> &lt; 0.001), accompanied by significant increases in electrical conductivity, pH, milk fat, lactose, and total solids. Diagnostic-day lameness showed strong positive correlations with SCC (<i>r</i> = 0.84) and electrical conductivity (<i>r</i> = 0.89), and a strong negative correlation with milk yield (<i>r</i> = -0.76). These findings indicate that lameness is associated with measurable changes in milk quality and reduced milk production under tropical Bangladeshi field conditions.</p>

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Lameness-associated changes in milk yield, composition, and inflammatory quality indicators in dairy cows under tropical conditions in Bangladesh

  • 期刊论文

  • 出版模式：

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  • 发表日期：

    2026年6月23日

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  • Solama Akter Shanta,
  • Mst. Tahomina Akter,
  • Muhammad Aktaruzzaman,
  • Md. Siam Ahmed,
  • A K M Anisur Rahman,
  • M. Ariful Islam

摘要

Lameness is a major welfare and economic challenge in dairy herds and is associated with reduced milk yield and compromised milk quality; however, evidence under tropical production systems such as Bangladesh remains limited. This observational study was conducted at a commercial dairy farm in Mymensingh, Bangladesh (July 2024-June 2025) to evaluate the effects of lameness on milk yield and inflammatory milk quality indicators. Sixteen Holstein-Friesian lactating cows were enrolled, including 12 clinically lame cows and 4 healthy controls. Lame cows were observed at three predefined stages: 7 days before clinical diagnosis, on the diagnostic day, and 7 days after diagnosis; healthy cows were sampled once as baseline references. Lameness was assessed using a standardized 1–5 locomotion scoring system. Milk yield was obtained from farm records, and milk quality traits, including pH, electrical conductivity, somatic cell count (SCC), fat, protein, lactose, solid-not-fat, and total solids, were analyzed using Ekomilk Horizon Unlimited. Multivariable linear mixed-effects models revealed a significant reduction in milk yield during lameness (15.0 +/- 0.6 L/day) compared with pre-diagnosis values (19.0 +/- 0.5 L/day; p < 0.001), representing a 21% decline. SCC increased more than two-fold (812.8 +/- 45.6 × 10^3 cells/mL; p < 0.001), accompanied by significant increases in electrical conductivity, pH, milk fat, lactose, and total solids. Diagnostic-day lameness showed strong positive correlations with SCC (r = 0.84) and electrical conductivity (r = 0.89), and a strong negative correlation with milk yield (r = -0.76). These findings indicate that lameness is associated with measurable changes in milk quality and reduced milk production under tropical Bangladeshi field conditions.