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<p>This study evaluated the effects of replacing corn with forage cactus in high-concentrate diets for lambs. We aimed that observe the performance, renal function, blood profile, and histomorphometry characteristics of feedlot lambs. Two experiments were conducted with non-castrated Santa Inês lambs, with average body weights of 19.0 ± 2.5&#xa0;kg and 32.2 ± 5.1, respectively, and a mean age of 120&#xa0;days. The lambs were assigned to four treatments with increasing levels of corn and forage cactus (0, 250, 500, and 750&#xa0;g/kg dry matter) in a randomized block design and completely randomized design. Higher concentrations of forage cactus in high non-fibrous carbohydrate diets compromised intake and apparent digestibility (<i>P &lt; </i>0.05), and reduced final body weight (<i>P = </i>0.001). However, hydric balance improved with increased levels of forage cactus in the diet (<i>P &lt; </i>0.05). Changes in renal physiology included increased urine volume (<i>P = </i>0.001), urinary pH (<i>P = </i>0.001), and phosphorus excretion (<i>P = </i>0.001). Blood metabolites related to energy and protein metabolism showed variations, and diets containing either forage cactus or corn grain modified the width of ruminal papillae and keratinized layers (<i>P &lt; </i>0.05), causing edema in rumen tissue. In summary, forage cactus can be included at up to 250&#xa0;g/kg in feedlot lambs’ diets, effectively supporting performance and providing a sustainable feeding strategy for Semi-arid regions, where water efficiency is essential.</p>

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Forage cactus as a substitute for corn as an energy source in the finishing of feedlot lambs

  • 期刊论文

  • 发表日期：

    2025年6月11日

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  • Pedro Henrique Borba Pereira,
  • Juliana Silva de Oliveira,
  • Ricardo Romão Guerra,
  • Ângela Imperiano da Conceição,
  • André Luiz Rodrigues Magalhães,
  • Dulciene Karla de Andrade Silva,
  • Safira Valença Bispo,
  • Geane Gonçalves Dias,
  • Cleyton de Almeida Araújo,
  • Roberta de Lima Valença,
  • Daniel Barros Cardoso,
  • Airon Aparecido Silva de Melo

摘要

This study evaluated the effects of replacing corn with forage cactus in high-concentrate diets for lambs. We aimed that observe the performance, renal function, blood profile, and histomorphometry characteristics of feedlot lambs. Two experiments were conducted with non-castrated Santa Inês lambs, with average body weights of 19.0 ± 2.5 kg and 32.2 ± 5.1, respectively, and a mean age of 120 days. The lambs were assigned to four treatments with increasing levels of corn and forage cactus (0, 250, 500, and 750 g/kg dry matter) in a randomized block design and completely randomized design. Higher concentrations of forage cactus in high non-fibrous carbohydrate diets compromised intake and apparent digestibility (P < 0.05), and reduced final body weight (P = 0.001). However, hydric balance improved with increased levels of forage cactus in the diet (P < 0.05). Changes in renal physiology included increased urine volume (P = 0.001), urinary pH (P = 0.001), and phosphorus excretion (P = 0.001). Blood metabolites related to energy and protein metabolism showed variations, and diets containing either forage cactus or corn grain modified the width of ruminal papillae and keratinized layers (P < 0.05), causing edema in rumen tissue. In summary, forage cactus can be included at up to 250 g/kg in feedlot lambs’ diets, effectively supporting performance and providing a sustainable feeding strategy for Semi-arid regions, where water efficiency is essential.