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<p>Heat stress is one of the main limiting factors for productivity and reproductive performance in beef cattle raised in extensive systems under tropical climates. Integrated systems, such as the Silvopastoral System (SIPAS), have been adopted as alternatives to mitigate excessive solar radiation and improve animal welfare. This study assessed the impact of providing shade for beef cows raised on pastures in Northwestern Paraná, Brazil. Ninety-four crossbred and purebred females (Nelore, Limousin × Angus), with an average age of two years and a Body Condition Score (BCS) between 2 and 4, were allocated into two groups: SIPAS (shaded cows) and SOL (unshaded cows). All females underwent Fixed-Time Artificial Insemination (FTAI) followed by resynchronization (Resync). Environmental variables (temperature, humidity, and THI-like index) and forage samples were collected. Pregnancy rates were significantly higher in the cows provided shade (SIPAS group) for Resync (<i>p</i> = 0.036) and for the cumulative result (FTAI + Resync) (<i>p</i> = 0.048). It is concluded that tree shading reduces thermal stress and significantly improves conception rates in beef cattle under tropical conditions.</p>

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Impact of silvopastoral shade on thermal stress and conception rates of beef cows in tropical pastures

  • 期刊论文

  • 发表日期：

    2025年11月28日

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  • Amanda Beatriz de Lima Costa,
  • Rafael Henrique Tonissi e Buschinelli de Goes,
  • Jefferson Rodrigues Gandra,
  • Gustavo Mafra Fernandes,
  • Gregory Fedri,
  • Lorrayne de Souza Araujo Martins Motta,
  • Antônio Campanha Martinez

摘要

Heat stress is one of the main limiting factors for productivity and reproductive performance in beef cattle raised in extensive systems under tropical climates. Integrated systems, such as the Silvopastoral System (SIPAS), have been adopted as alternatives to mitigate excessive solar radiation and improve animal welfare. This study assessed the impact of providing shade for beef cows raised on pastures in Northwestern Paraná, Brazil. Ninety-four crossbred and purebred females (Nelore, Limousin × Angus), with an average age of two years and a Body Condition Score (BCS) between 2 and 4, were allocated into two groups: SIPAS (shaded cows) and SOL (unshaded cows). All females underwent Fixed-Time Artificial Insemination (FTAI) followed by resynchronization (Resync). Environmental variables (temperature, humidity, and THI-like index) and forage samples were collected. Pregnancy rates were significantly higher in the cows provided shade (SIPAS group) for Resync (p = 0.036) and for the cumulative result (FTAI + Resync) (p = 0.048). It is concluded that tree shading reduces thermal stress and significantly improves conception rates in beef cattle under tropical conditions.