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A note on the effect of monensin sodium administered by intraruminal controlled-release devices on productivity of dairy cows at pasture

Published online by Cambridge University Press:  02 September 2010

G. A. Lynch ,
M. E. Hunt  and
S. N. McCutcheon
G. A. Lynch
Affiliation:
Farms Administration, Massey University, Palmerston North, New Zealand
M. E. Hunt
Affiliation:
Farms Administration, Massey University, Palmerston North, New Zealand
S. N. McCutcheon
Affiliation:
Department of Animal Science, Massey University, Palmerston North, New Zealand
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Abstract

The effects of monensin sodium, administered by intraruminal controlled-release devices at a rate of 320 mglday, on milk and milk solids production and bloat score were examined in a trial with 90 lactating dairy cows given only mixed ryegrasslwhite clover pasture. Monensintreated cows had significantly greater yields of milk and milk protein than control cows (1397·2 (s.e. 22·9) v. 1296·9 (s.e. 16·3) kg milk, 49·6 (s.e. 0·9) v. 46·5 (s.e. 0·6) kg protein) over the 14-week period of treatment (P < 0·01). Yield of fat was similar in monensin-treated and control cows (62·9 (s.e. 1·5) v. 63·4 (s.e. 1·1) kg). Live weight, condition score and bloat score were not influenced by treatment but pasture conditions were not conducive to severe bloat challenge.

Keywords

bloatdairy cowsmilk productionmonensin
Type
Research Article
Information
Animal Production , Volume 51 , Issue 2 , October 1990 , pp. 418 - 421
Copyright
Copyright © British Society of Animal Science 1990

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References

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