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Department of Animal Science, University of Kentucky, Lexington 40546
4 To whom reprint requests should be addressed.
ABSTRACT
Thirty-six male and female Holstein and Jersey calves were assigned at weaning to a randomized complete block design in a 2 x 3 factorial arrangement to evaluate the influence of two dietary cation-anion balances (–14 and +39 meq(Na + K) – (Cl + S) per 100 g diet DM) and three amounts of dietary P (.22, .29, and .37%) on performance and P metabolism from 9 to 19 wk of age. Feed intake, average daily gain, and serum inorganic P were higher on the anionic diets and increased with increasing dietary P. Body weights were higher on the .37% P diets by wk 3 and on the anionic diets by wk 6. The interaction of dietary P and cation-anion balance was responsible for significant differences in calf performance; the anionic diet exhibited marked improvement over the cationic diet at the lowest P concentration. Results indicate that the availability of P for young dairy calves 5be higher with anionic than cationic diets.
1 This manuscript (88-5-29) is published with the approval of the Director of the Kentucky Agricultural Experiment Station.
2 Presently under appointment by the Foreign Mission Board S.B.C., on loan to the School of Agriculture, University of Bophuthatswana, Africa, Private Bag X2046 Mafikeng, 8670, Bophuthatswana, Southern Africa.
3 Present address: Animal Science Department, Oklahoma State University, Stillwater 74078.
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