Intake rate and jaw movements of grazing dairy cows facing reduced herbage height

Autores/as

  • Juan Daniel Jiménez Rosales Universidad Autónoma Chapingo. Posgrado en Producción Animal, km 38.5 Carretera México-Texcoco, 56230 Texcoco, Estado de México, México. https://orcid.org/0000-0001-6627-7414
  • Ricardo Daniel Améndola Massiotti Universidad Autónoma Chapingo. Posgrado en Producción Animal, km 38.5 Carretera México-Texcoco, 56230 Texcoco, Estado de México, México. https://orcid.org/0000-0001-6763-281X
  • Roberto López Victoria Universidad Autónoma Chapingo. Departamento de Zootecnia, Estado de México, México.
  • Juan Andrés Burgueño Ferreira Centro Internacional de Mejoramiento de Maíz y Trigo. Estado de México, México. https://orcid.org/0000-0002-1468-4867

DOI:

https://doi.org/10.22319/rmcp.v16i4.6953

Palabras clave:

Biting rate, Chewing rate, Chew-bite, Bite mass, Herbage intake

Resumen

Grazing dairy production is limited by low herbage intake, and the characteristics of herbage affect jaw movements and intake rate of cows. The objective was to evaluate the intake rate and jaw movements of cows grazing Avena strigosa at three percentages of herbage height reduction (0, 50 and 70 %), as it would have been due to grazing. The experimental design was a 3 x 3 repeated Latin square and treatments were randomly assigned to 18 plots of 3 m². Measurements were performed on six cows during three consecutive days, during each measurement day, two groups of three cows were assigned to treatments in 10 min grazing sessions. Jaw movements were measured by acoustic analysis of the 18 sound recordings of the grazing sessions. With increasing reduction in herbage height, intake rate decreased (P≤ 0.05), while cows maintained constant (P≥0.05) rates of total jaw movements (69.9 min-1) and chew movements (29.7 chews min-1) but tended (P=0.057) to decrease the rate of compound movements (chew-bite) and increase (P≤0.05) the rate of exclusive bites. To maintain a high intake rate at tall herbage (0 % of reduction in herbage height), cows allocated a higher proportion of compound movements, which were needed to process the higher bite mass; but were less efficient when grazing shorter pastures (70 % of reduction in herbage height) due to the increase in total jaw movements per gram of dry matter ingested.

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Publicado

18.11.2025

Cómo citar

Jiménez Rosales, J. D., Améndola Massiotti, R. D., López Victoria, R., & Burgueño Ferreira, J. A. (2025). Intake rate and jaw movements of grazing dairy cows facing reduced herbage height. Revista Mexicana De Ciencias Pecuarias, 16(4), 868–884. https://doi.org/10.22319/rmcp.v16i4.6953
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Vol. 16 Núm. 4 (2025): Octubre-Diciembre

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