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<p>Pasture-based dairy systems require well-adapted forage cultivars and appropriate grazing management to sustain milk production while maintaining favorable sward structure. The objective of this study was to evaluate the performance of Holstein × Gyr crossbred cows and the productive and structural characteristics of Paiaguás grass pasture (<i>Urochloa brizantha</i> cv. BRS Paiaguás) and Ipyporã grass pasture (<i>Urochloa brizantha</i> × <i>Urochloa ruziziensis</i> cv. BRS Ipyporã), under rotational stocking during two rainy season. For the agronomic variables, a completely randomized design was adopted in a split-plot design: two grasses and three experimental phases, with twelve paddocks evaluated per phase. The arrangement for milk yield and milk composition was the complete switchback trial, and for dry matter intake, it was the cross-over. Paiaguás grass showed greater herbage mass, accumulation and herbage accumulation rate. Ipyporã grass showed a greater leaf: stem ratio (1.54 vs. 1.02) and greater volumetric density (127.45 vs. 108.15&#xa0;kg DM cm ha<sup>− 1</sup>). Milk yield did not differ between cultivars or experimental phases with an average value of 107.65&#xa0;L ha<sup>− 1</sup> day<sup>− 1</sup>). Stocking rate was higher in Paiaguás grass pasture compared with Ipyporã grass (7.71 vs. 6.90 AU ha<sup>− 1</sup>). Dry matter intake differed between cultivars only in phase 2, when it was higher for Ipyporã grass compared with Paiaguás grass (2.21 vs. 1.97% of body weight, respectively). Both cultivars supported a great milk yield when managed with 41&#xa0;cm pre-grazing height for cv. BRS Ipyporã and 63&#xa0;cm for cv. BRS Paiaguás, and 50% defoliation.</p>

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Canopy structure, dry matter intake and performance of Holstein × Gyr cows (Bos taurus taurus L. × Bos taurus indicus L.) under rotational stocking in Urochloa spp. pastures

  • 期刊论文

  • 出版模式：

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  • 发表日期：

    2026年6月22日

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  • Natalia Avila Soares,
  • Carlos Augusto de Miranda Gomide,
  • Patrícia do Rosário Rodrigues,
  • Domingos Sávio Campos Paciullo,
  • Mirton José Frota Morenz,
  • Angelo Herbet Moreira Arcanjo,
  • Fernando Antônio de Souza,
  • Fernanda de Kássia Gomes,
  • Pedro Drummond Rodrigues,
  • Ângela Maria Quintão Lana

摘要

Pasture-based dairy systems require well-adapted forage cultivars and appropriate grazing management to sustain milk production while maintaining favorable sward structure. The objective of this study was to evaluate the performance of Holstein × Gyr crossbred cows and the productive and structural characteristics of Paiaguás grass pasture (Urochloa brizantha cv. BRS Paiaguás) and Ipyporã grass pasture (Urochloa brizantha × Urochloa ruziziensis cv. BRS Ipyporã), under rotational stocking during two rainy season. For the agronomic variables, a completely randomized design was adopted in a split-plot design: two grasses and three experimental phases, with twelve paddocks evaluated per phase. The arrangement for milk yield and milk composition was the complete switchback trial, and for dry matter intake, it was the cross-over. Paiaguás grass showed greater herbage mass, accumulation and herbage accumulation rate. Ipyporã grass showed a greater leaf: stem ratio (1.54 vs. 1.02) and greater volumetric density (127.45 vs. 108.15 kg DM cm ha− 1). Milk yield did not differ between cultivars or experimental phases with an average value of 107.65 L ha− 1 day− 1). Stocking rate was higher in Paiaguás grass pasture compared with Ipyporã grass (7.71 vs. 6.90 AU ha− 1). Dry matter intake differed between cultivars only in phase 2, when it was higher for Ipyporã grass compared with Paiaguás grass (2.21 vs. 1.97% of body weight, respectively). Both cultivars supported a great milk yield when managed with 41 cm pre-grazing height for cv. BRS Ipyporã and 63 cm for cv. BRS Paiaguás, and 50% defoliation.