Seguimiento continuo de los cambios de ph y temperatura ruminal mediante sensores inalámbricos y modelos logísticos en cabras

• A. Castro Costa ^[2] ; G. Caja ^[2] ; A.A.K. Moll ^[3] ; J. Aguiló ^[1]
  1. [1] Universitat Autònoma de Barcelona

     Universitat Autònoma de Barcelona

     Barcelona, España

     
  2. [2] G2R
  3. [3] GRESA

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• Localización: XVI Jornadas sobre Producción Animal: 19 y 20 de mayo de 2015, Zaragoza / Javier Álvarez Rodríguez (aut.), Begoña Panea Doblado (aut.), Jorge Hugo Calvo Lacosta (aut.), Mireia Blanco Alibés (aut.), José Alfonso Abecia Martínez (aut.), Daniel Villalba Mata (aut.), María Ángeles Latorre Górriz (aut.), Vol. 1, 2015, ISBN 978-84-606-7969-1, págs. 227-229
• Idioma: español
• Títulos paralelos:
  • Continuous monitoring of ruminal ph and temperature using wireless sensors and logístic models in goats
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• Resumen

  • Non-lactating dairy goats provided with wireless rumen sensors for pH and temperature measurements and fed once-daily at maintenance, were used to assess the rumen function changes produced by dietary (Exp. 1) and climatic (Exp. 2) conditions. Rumen sensors (KB1001, Kahne, Auckland, NZ) were inserted surgically and programmed to collect data every 30 min. Obtained values were modelled by logistic regressions. Respiratory rate and rectal temperature were recorded 3 times daily. In Exp. 1, 2 groups of 4 goats each were fed high forage (HF, 70:30) or low forage (LF, 30:70) to concentrate diets in a crossover design. Goats were fed for 4-h and tap water (4 L, 9.8 ± 0.4 °C) offered for only 30 min at 6-h. Rumen pH fell after feeding, reaching different nadir according to diet (HF, 6.35 ± 0.07 at 11-h; LF, 6.07 ± 0.07 at 6-h post-feeding, respectively) and on average were greater (+0.31 ± 0.06) in HF than LF. No diet effect was detected in rectal (38.2 ± 0.1 °C) and ruminal (38.9 ± 0.1 °C) temperatures which positively correlated (R2 = 0.83). Rumen temperature (fasting value, 38.2 ± 0.1 °C) dramatically changed by feeding (+1.4 ± 0.1°C) and drinking (-3.4 ± 0.1°C) in both groups. In Exp. 2, 2 groups of 4 goats fed a 50:50 diet were exposed to thermal neutral (TN, 20 to 23 °C day-night) and heat stress (HS, 12-h day at 37°C and 12-h night at 30°C) conditions following a crossover design. Humidity (40%) and photoperiod (light-dark, 12-12 h) were similar and water was freely available at ambient temperature. Despite their similar dry matter intake, rumen pH was lower in HS than in TN goats (-0.12 ± 0.04). On the contrary, rumen temperature (+0.30 ± 0.01 °C), rectal temperature (+0.4 ± 0.01°C), respiratory rate (+77 ± 5 breathes/min) and water intake (+3.2 ± 0.7 L/d) were greater in HS than TN, indicating an altered rumen fermentation. In conclusion, wireless bolus sensors and logistic models proved to be useful for monitoring rumen function.