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Supplementation of grass silage-based diets with small quantities of concentrates: strategies for allocating concentrate crude protein

Published online by Cambridge University Press:  02 September 2010

K. Aston ,
W. J. Fisher ,
A. B. McAllan ,
M. S. Dhanoa  and
R. J. Dewhurst
K. Aston
Affiliation:
Institute of Grassland and Environmental Research, Trawsgoed Research Farm, Trawsgoed, Ceredigion SY23 4LL
W. J. Fisher
Affiliation:
Institute of Grassland and Environmental Research, Trawsgoed Research Farm, Trawsgoed, Ceredigion SY23 4LL
A. B. McAllan
Affiliation:
Institute of Grassland and Environmental Research, Plas Gogerddan, Aberystwyth, Ceredigion SY23 3EB
M. S. Dhanoa
Affiliation:
Institute of Grassland and Environmental Research, Plas Gogerddan, Aberystwyth, Ceredigion SY23 3EB
R. J. Dewhurst
Affiliation:
Institute of Grassland and Environmental Research, Plas Gogerddan, Aberystwyth, Ceredigion SY23 3EB
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Abstract

Fifty-five multiparous Holstein-Friesian cows were used to evaluate the short- and long-term effects of varying the crude protein (CP) content of concentrates offered at a low level (5 kg/day) along with ad libitum access to a high quality grass silage. Three dietary treatment groups in lactation weeks 4 to 22 received concentrates containing either 156 (L), 247 (M) or 338 (H) g CP per kg dry matter; from weeks 13 to 21, half of the L animals changed over to the H concentrate and vice versa so that there were five treatment groups (LL, LH, MM, HL and HH). Feeding M or H compared with L increased silage voluntary intakes (P <0·05) and the yields of milk (P <0·05), fat (P < 0·05) and protein (P < 0·01). Milk protein concentration increased with level of concentrate CP (P < 0·05). Pattern of concentrate CP supply (comparison ofLH, MM and HL) had no significant effect on intake or yields of milk and milk solids across the experiment (weeks 4 to 21), though cows gained less weight on treatment HL than on LH (P <0·05) or MM. Intake, milk and component yields were all markedly affected by a change in concentrate CP at week 13; there were positive effects of additional CP (LL v. LH) and negative effects of reduced CP (HH v. HL) on silage intake (P <0·05), as well as milk yield (P < 0·001), milk protein yield (P < 0·001) and milk protein concentration (P < 0·001). Responses to increased concentrate CP were of a similar magnitude in early and midlactation; extra concentrate CP can recover depressed yields and concentrations of milk protein in established lactation. Production responses to concentrate CP involved a concomitant increase in silage voluntary intake.

Keywords

dairy cowsconcentratesfood intakegrass silagemilk productionprotein
Type
Research Article
Information
Animal Science , Volume 67 , Issue 1 , August 1998 , pp. 17 - 26
Copyright
Copyright © British Society of Animal Science 1998

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