J. Anim Sci.
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J. Anim Sci. 1988. 66:566-573.
© 1988 American Society of Animal Science
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Performance, Blood and Ruminal Characteristics of Cows Receiving Monensin and a Magnesium Supplement

E. E. Grings and J. R. Males1,2,3,

Washington State University, Pullman 99164-6320

Abstract

Forty-eight Angus and Hereford cows were used in a completely random design with a 2 x 2 factorial arrangement of treatments to evaluate the effects of monensin and two sources of Mg on performance, ruminal characteristics and mineral status of mature beef cows. Cows were fed wheat straw treated with NH3 during late gestation and straw treated with NH3 plus bromegrass haylage after calving along with a protein supplement that contained either MgO (7.5 g/kg) or MgSO4 (11 g/kg). One half of the cows received monensin (1 g/kg) in their protein supplement. During the precalving period, MgO without monensin increased (P<.01) plasma Mg compared with Mg in plasma of cows receiving MgSO4 or MgO with monensin. Magnesium oxide also increased cow weight gains during late gestation (P<.05) compared with weight gains of cows supplemented with MgSO4, but magnesium source had no effect on weight gain postcalving. Plasma glucose was increased by monensin (P<.05) and by MgSO4 (P<.01) during early lactation. Monensin increased the proportion of propionate before (P<.05) and after (P<.10) calving in the ruminal fluid of cows. Monensin also increased (P<.05) cow weight gain precalving and tended to decrease (P<.10) milk fat in lactating cows. Calf weight gains were not affected by treatment of dam. Magnesium oxide appeared to have higher Mg bioavailability than MgSO4 for cows precalving, but Mg bioavailability was not different postcalving. Monensin increased cow weight gains precalving and improved feed efficiency postcalving.

Footnotes

1 Published as scientific paper no. 7726, College of Agric. and Home Econ. Res. Center, Washington State Univ., Pullman. Project no. 0539.

2 Dept. of Anim. Sci.

3 The authors wish to acknowledge the Washington Beef Commission for financial support for this research.






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Copyright © 1988 by the American Society of Animal Science.