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Phosphorus fertilizer for nitrogen-fertilized dairy pastures. 3. Milk responses to a dietary phosphorus supplement

Published online by Cambridge University Press:  01 September 1997

R. G. WALKER ,
T. M. DAVISON ,
W. N. ORR  and
B. A. SILVER
R. G. WALKER
Affiliation:
Queensland Department of Primary Industries, Kairi Research Station, PO Box 27, Kairi, Queensland 4872, Australia
T. M. DAVISON
Affiliation:
Queensland Department of Primary Industries, Mutdapilly Research Station, MS 825, Peak Crossing, Queensland 4306, Australia
W. N. ORR
Affiliation:
Queensland Department of Primary Industries, Mutdapilly Research Station, MS 825, Peak Crossing, Queensland 4306, Australia
B. A. SILVER
Affiliation:
Queensland Department of Primary Industries, Kairi Research Station, PO Box 27, Kairi, Queensland 4872, Australia
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Abstract

Dairy cows grazing a tropical grass pasture fertilized with 300 kg N/ha and with a 7-year history of phosphorus fertilizer at either 0 or 45 kg P/ha were given a P supplement in a 2 × 2 factorial experiment at Kairi Research Station, Queensland, Australia. Milk yield, fat-corrected milk yield, yields of milk fat, protein and lactose, and protein content of milk were increased (P<0·05) with P fertilizer. There was no response in milk yield or any component of milk to the provision of a P supplement. It is concluded that the milk response recorded in this experiment was due to P fertilizer leading to additional pasture on offer and increased pasture intake. The lack of response to additional P in the form of a supplement indicates that these pastures can supply adequate P for cows producing 20 kg/day even after 8 years without P fertilizer.

Type
Research Article
Information
The Journal of Agricultural Science , Volume 129 , Issue 2 , September 1997 , pp. 233 - 236
Copyright
© 1997 Cambridge University Press

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