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Effect of monensin sodium on lactational performance of autumn- and spring-calving cows

Published online by Cambridge University Press:  06 September 2002

JAMES A. MAAS
Affiliation:
Department of Animal and Food Sciences, University of Delaware, USA
STUART N. McCUTCHEON
Affiliation:
Institute of Veterinary, Animal and Biomedical Sciences, Massey University, Palmerston North, New Zealand
GAVIN F. WILSON
Affiliation:
Institute of Veterinary, Animal and Biomedical Sciences, Massey University, Palmerston North, New Zealand
GERARD A. LYNCH
Affiliation:
Institute of Veterinary, Animal and Biomedical Sciences, Massey University, Palmerston North, New Zealand
MURRAY E. HUNT
Affiliation:
Institute of Veterinary, Animal and Biomedical Sciences, Massey University, Palmerston North, New Zealand
LES A. CROMPTON
Affiliation:
Department of Agriculture, The University of Reading, Earley Gate, Reading, UK

Abstract

Monensin sodium is widely used to manipulate ruminal fermentation (Bergen & Bates, 1984), with the aim of increasing energy supply to the animal. Monensin has been most widely used in diets of beef cattle and young growing dairy cattle, particularly in confinement management systems, where the ionophore can be mixed directly into the ration. Accurate daily dosing of grazing ruminants with small quantities of rumen modifiers, such as ionophores, proved particularly labour-intensive and expensive until the development of the controlled-release capsule (CRC; Laby et al. 1984). Subsequently a commercially available CRC containing monensin sodium was developed (Elanco Animal Health, Cambridge, NZ) facilitating its use in grazing animals. It has also been tested as a method of reducing the incidence of bloat in lactating dairy cows grazing pastures containing legumes.

Type
Research Article
Copyright
© Proprietors of Journal of Dairy Research 2002

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