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Effects of monensin and yeast supplementation on blood acid-base balance in finishing feedlot steers fed a high-grain, high-protein diet

Published online by Cambridge University Press:  09 March 2007

C. Castillo ,
J. Hernández ,
J. Méndez ,
P. García-Partida ,
V. Pereira ,
P. Vázquez ,
M. López Alonso  and
J. L. Benedito
C. Castillo*
Affiliation:
Departamento de Patología Animal, Facultad de Veterinaria, Universidad de Santiago de Compostela, Spain.
J. Hernández
Affiliation:
Departamento de Patología Animal, Facultad de Veterinaria, Universidad de Santiago de Compostela, Spain.
J. Méndez
Affiliation:
Departamento Técnico de COREN, SCL, Orense, Spain
P. García-Partida
Affiliation:
Departamento de Patología Animal, Facultad de Veterinaria, Universidad Complutense de Madrid, Spain
V. Pereira
Affiliation:
Departamento de Patología Animal, Facultad de Veterinaria, Universidad de Santiago de Compostela, Spain.
P. Vázquez
Affiliation:
Departamento de Patología Animal, Facultad de Veterinaria, Universidad de Santiago de Compostela, Spain.
M. López Alonso
Affiliation:
Departamento de Patología Animal, Facultad de Veterinaria, Universidad de Santiago de Compostela, Spain.
J. L. Benedito
Affiliation:
Departamento de Patología Animal, Facultad de Veterinaria, Universidad de Santiago de Compostela, Spain.
*
†E-mail: ccasti@lugo.usc.es
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Abstract

The aim of this study was to evaluate the effects of two dietary supplements (monensin and a live yeast culture) on acid-base balance in steers maintained in a commercial feedlot system, considering effects over the finishing productive cycle. Steers (no. =42) were allotted randomly to one of the three study groups: (1) control group (no supplementation, C), (2) monensin supplementation (MON), and (3) live Saccharomyces cerevisiae strain 47 supplementation (SACC). Venous blood samples were collected for the measurement of acid-base parameters and l-lactate. Production parameters were also used as a complementary tool for understanding the internal changes associated with supplementation. During the finishing period, MON steers tended to gain more efficiently than C and SACC steers. In the C group, the finishing-period diet caused a progressive decline in blood bases, in line with the high-grain diet consumption. In contrast, supplemented animals did not show this trend, although lower HCO3− and base excess values were registered in SACC steers than in MON, indicating that ionophore supplementation is less effective for reducing blood base consumption than yeast supplementation. In our study, the lack of the expected response to yeast supplementation may be attributable to the high crude protein content of the ration, a common feature of commercial feedlot industries.

Keywords

acid-base equilibriumfeedlotsmonensinsteersyeasts
Type
Research Article
Information
Animal Science , Volume 82 , Issue 5 , October 2006 , pp. 653 - 659
Copyright
Copyright © British Society of Animal Science 2006

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