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The influence of plane of nutrition and diet composition on the performance of dairy cows

Published online by Cambridge University Press:  27 March 2009

W. H. Broster ,
J. D. Sutton ,
J. A. Bines ,
Valerie J. Broster ,
T. Smith ,
J. W. Siviter ,
V. W. Johnson ,
D. J. Napper  and
E. Schuller
W. H. Broster
Affiliation:
National Institute for Research in DairyingShinfield, Reading, RG2 9AT
J. D. Sutton
Affiliation:
National Institute for Research in DairyingShinfield, Reading, RG2 9AT
J. A. Bines
Affiliation:
National Institute for Research in DairyingShinfield, Reading, RG2 9AT
Valerie J. Broster
Affiliation:
National Institute for Research in DairyingShinfield, Reading, RG2 9AT
T. Smith
Affiliation:
National Institute for Research in DairyingShinfield, Reading, RG2 9AT
J. W. Siviter
Affiliation:
National Institute for Research in DairyingShinfield, Reading, RG2 9AT
V. W. Johnson
Affiliation:
National Institute for Research in DairyingShinfield, Reading, RG2 9AT
D. J. Napper
Affiliation:
National Institute for Research in DairyingShinfield, Reading, RG2 9AT
E. Schuller
Affiliation:
National Institute for Research in DairyingShinfield, Reading, RG2 9AT
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Summary

Seventy-six first-calf cows (heifers), 32 second·calf cows and 39 adult cows participated in a trial in which three diets composed of 60:40, 75:25, 90:10 proportions of compound to hay (hay dry-matter digestibility 0·6) were given for the first 36 weeks of lactation in amounts to provide daily an estimated 125, 156 MJ and ad libitum digestible energy (DE) for heifers, and 156, 187 MJ and ad libitum DE for the other parities. The ad libitum intakes were 150 and 200 MJ DE daily for heifers and for older cows respectively. Greater compound content of the diet and larger daily allowance of DE were associated with increased occurrence of mastitis and lameness but not digestive upsets. Dry·matter (D.M.) digestibility was increased with a greater proportion of compound in the diet but was not affected by the amount consumed or stage of lactation. Milk yield and live·weight change were increased linearly and additively by a greater intake of digestible dry matter and by a greater proportion of compound in the diet, throughout the lactation save for no effect of diet composition on live·weight change in early lactation. On equal feed intakes older cows gave more milk and lost more live weight than heifers in early lactation but not thereafter; responses to additional feed were equal for all parities studied. Milk fat concentration was reduced both by increased allowance and by the high compound diet. Milk solids·not·fat (SNF) concentration was not affected by the treatments. Yield of milk fat was not affected by amount eaten and was reduced by the 90:10 diet. Yields of SNF and milk energy were increased by amount eaten and by increased compound in the diet. Thirty-two primiparous cows continued on their experimental treatments without interruption to the end of the second lactation. In the second lactation the effects on yields of milk, milk energy, and SNF were magnified indicating a cumulative effect from lactation to lactation. Little cumulative effect was observed on either milk fat yield, or concentrations of fat and SNF in milk. More generous feeding was associated with reduced milk output/unit D.M. consumed in the first but not the second lactation. More generous feeding improved live·weight change less in the second than in the first lactation. No cumulative effects over two lactations were observed consequent upon variation in diet composition.

Type
Research Article
Information
The Journal of Agricultural Science , Volume 104 , Issue 3 , June 1985 , pp. 535 - 557
Copyright
Copyright © Cambridge University Press 1985

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