Influence of time between ruminal glucose challenges on rumen function
Por:
Montaño-Gómez M.F., Mellado-Bosque M., Chirino-Romero J.O., González-Vizcarra, Manríquez-Nuñez O.M., Guevara-Florentino O.F., Raymundo-Hernández C., Ramírez-Bribiesca E., Zinn R.A.
Publicada:
1 ene 2016
Resumen:
Ruminal lactic acidosis is one of the most important metabolic problems in feedlot cattle. Gradually transitioning cattle to finishing-feedlot diets may reduce the risk for ruminal acidosis by providing sufficient time for adaptation. This adaptation of feedlot cattle to high-concentrate diets may causes marked changes in the ruminal environment, and time is required to establish stable ruminal conditions. However, few studies have evaluated the ruminal adaptation in steers. A metabolism trial was conducted to evaluate the effects of two consecutive glucose challenges on rumen function in steers fed a high-energy finishing diet. Four Holstein steers (320 kg LW) with cannula in the rumen were used in a 4 x 4 Latin square design. Four treatments were used and consisted of the time elapsed between both challenges of glucose (2, 4, 6 or 8 d). Ruminal fluid samples were taken at 0700 h (just prior the first glucose challenge), and from the second challenge (d 2, 4, 6, or 8) at 1 h before and 2, 4, 6, 8, 28, 52, 124, 196 and 268 h. As the time between fluctuation of energy intake increased, ruminal fluid pH (P <0.05) and ruminal L-lactic acid increased linearly (P <0.10) after the first challenge. However, ruminal pH and L-lactic acid were not related (P >0.10). During the first 6 h following the second glucose challenge ruminal fluid pH decreased. No effects of treatments on ruminal pH were observed (P >0.10) among treatments from 3 days after the second challenge. Ruminal fluid osmotic pressure increased (P <0.10) after dosed glucose with all treatments. Ruminal osmolality increased (P <0.10) as the time between challenges were 2 or 4 days. After dosed glucose, total volatile fatty acids increased, except by treatment 1 after second challenge. Total volatile fatty acid and pH were related positively (R2=0.69). As the time increased, a tendency on increment of concentrations of protozoa was observed. Ruminal glucose concentration decreased linearly (P <0.10) 2 h after the second fluctuation of energy intake. We conclude that ruminal alterations are magnified as the time between glucose challenge decreases. © 2016, Universidad Autonoma de Yucatan. All rights reserved.
Filiaciones:
Montaño-Gómez M.F.:
Instituto de Investigaciones en Ciencias Veterinarias, Universidad Autónoma de Baja California, Mexico
Mellado-Bosque M.:
Universidad Autónoma Agraria Antonio Narro, Departamento de Producción Animal, Saltillo, Mexico
Chirino-Romero J.O.:
Instituto de Investigaciones en Ciencias Veterinarias, Universidad Autónoma de Baja California, Mexico
González-Vizcarra:
Instituto de Investigaciones en Ciencias Veterinarias, Universidad Autónoma de Baja California, Mexico
Manríquez-Nuñez O.M.:
Instituto de Investigaciones en Ciencias Veterinarias, Universidad Autónoma de Baja California, Mexico
Guevara-Florentino O.F.:
Instituto de Investigaciones en Ciencias Veterinarias, Universidad Autónoma de Baja California, Mexico
Raymundo-Hernández C.:
Instituto de Investigaciones en Ciencias Veterinarias, Universidad Autónoma de Baja California, Mexico
Ramírez-Bribiesca E.:
Colegio de Posgraduados, Programa de Ganadería, Montecillo, Edo de México, Mexico
Zinn R.A.:
Department of Animal Science, University of California, Davis, CA 95616, United States
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