J. Anim Sci.
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J. Anim Sci. 1989. 67:3463-3469.
© 1989 American Society of Animal Science
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Use of Animal Breeds and Breeding to Overcome the Incidence of Grass Tetany: A Review1

L. W. Greene, J. F. Baker and P. F. Hardt

Texas Agricultural Experiment Station and Texas A&M University2,3, College Station 77843

Abstract

British breeds of cattle are not so effective as Zebu in extracting nutrients from low-quality roughages, and these breeds differ in their nutrient metabolism and animal physiology. Breeds of cattle may differ in their requirements for Mg. Brahman cows are less susceptible to death from disease and metabolic disorders than are British breeds of cattle, whereas cows with 50% or greater dairy breeding (Holstein and Jersey) are more susceptible than British or Brahman breeds when maintained in beef production herds. Brahman or Brahman crossbred cows are less susceptible than other breeds to metabolic disorders such as grass tetany. Magnesium absorption has been shown to be greater in Brahman than in Jersey, Holstein and Hereford cows. These differences in the efficiency of Mg absorption between different breeds of cows may be due to genetic variation in the absorptive mechanisms of Mg, in feeding behavior, in gastrointestinal tract motility, in gastrointestinal tract fill or to some combination.

Footnotes

1 Presented at a symposium titled "Magnesium Metabolism and Grass Tetany" at the ASAS 80th Annu. Mtg., New Brunswick, NJ.

2 Journal paper TA 24055. Texas A&M Univ., Texas Agric. Exp. Sta. Dept. of Anim. Sci. Appreciation is expressed to the Texas Agric. Exp. Sta. staff located at the McGregor Research Center, McGregor, TX for their assistance in managing the research herd that was used to collect a portion of this data.

3 Reference to a company or trade name does not imply approval or endorsement by the Texas Agric. Exp. Sta.






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