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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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References

Agricultural and Food Research Council. 1992. Technical Committee on Responses to Nutrients, report no. 9. Nutritive requirements of ruminant animals: protein. Nutrition Abstracts and Reviews, Series B 62: 788–835.Google Scholar
Agricultural Research Council. 1965. The nutrient requirements of farm livestock. No. 2. Ruminants. Agricultural Research Council, London.Google Scholar
Aston, K., Sutton, J. D. and Fisher, W. J. 1995. Milk production from grass silage diets: strategies for concentrate allocation. Animal Science 61: 465–480.CrossRefGoogle Scholar
Aston, K., Thomas, C., Daley, S. R. and Sutton, J. D. 1994a. Milk production from grass silage diets: effects of the composition of supplementary concentrates. Animal Production 59: 335–344.Google Scholar
Aston, K., Thomas, C., Daley, S. R., Sutton, J. D. and Dhanoa, M. S. 1994b. Milk production from grass silage diets: effects of silage characteristics and the amount of supplementary concentrate. Animal Production 59: 31–41.Google Scholar
Cammell, S. B., Beever, D. E., Sutton, J. D., Spooner, M. C. and Haines, M. J. 1992. Body composition and performance of autumn-calving Holstein-Friesian dairy cows during lactation: energy partition. Animal Production 54: 475 (abstr.).Google Scholar
Carlsson, J., Bergstrom, J. and Pehrson, B. 1995. Variation with breed, age, season, yield, stage of lactation and herd in the concentration of urea in bulk milk and in individual cows milk. Ada Veterinaria Scandinavica 36: 245–254.CrossRefGoogle Scholar
Castle, M. E. and Watson, J. N. 1976. Silage and milk production: a comparison between barley and groundnut cake as supplements to silage of high digestibility. Journal of the British Grassland Society 31: 191–195.CrossRefGoogle Scholar
Davies, O. D. 1992. The effects of protein and energy content of compound supplements offered at low levels to October-calving dairy cows given grass silage ad libitum. Animal Production 55: 169–175.Google Scholar
Dewhurst, R. J., Mitton, A. M., Offer, N. W. and Thomas, C. 1996. Effects of the composition of grass silages on milk production and nitrogen utilization by dairy cows. Animal Science 62: 25–34.CrossRefGoogle Scholar
Genstat 5 Committee. 1987. Genstat 5 reference manual. Clarendon Press, Oxford.Google Scholar
Moorby, J. M., Dewhurst, R. J. and Marsden, S. 1996. Effect of increasing digestible undegradable protein supply to dairy cows in late gestation on the yield and composition of milk during the subsequent lactation. Animal Science 63: 201–213.CrossRefGoogle Scholar
Oldham, J. D. 1996. Can high genetic merit animals survive and breed? In Grass and forage for cattle of high genetic merit.Proceedings of the British Grassland Society winter meeting, Abbey Hotel, Great Malvern, 25–2611 1996. ISBN 0905944 44 5.Google Scholar
Oldham, J. D. and Smith, T. 1982. Protein-energy interrelationships for growing and for lactating cattle. In Protein contribution of feedstuffs for ruminants (ed. Miller, E. L., Pike, I. H. and Es, A. J. H. van), pp. 103–130. Butterworths, London.CrossRefGoogle Scholar
Oltner, R. and Sjaunja, L.-O. 1982. Evaluation of a rapid method for the determination of urea in cow's milk. Ada Veterinaria Scandinavica 23: 39–45.CrossRefGoogle ScholarPubMed
Østergaard, V. 1979. Strategies for concentrate feeding to attain optimum feeding level in high yielding dairy cows. Beretningfra Statens Husdyrbrugsforsøg, Kobenhavn, no. 482.Google Scholar
Rae, R. C, Golightly, A. J., Marshall, D. R. and Thomas, C. 1986. The effect of fish meal and soya-bean meal supplements on milk production of autumn-calving cows given ad libitum access to ryegrass silage. Animal Production 42: 435 (abstr.).Google Scholar
Rijpkema, Y. S., Reeuwijk, L. van and Goedhart, P. W. 1990. Effects of pattern of concentrate feeding on milk production of dairy cows offered silage ad libitum. Netherlands Journal of Agricultural Science 38: 461–474.CrossRefGoogle Scholar
Sutton, J. D., Aston, K., Beever, D. E. and Fisher, W. J. 1994. Milk production from grass silage diets: the relative importance of the amounts of energy and crude protein in the concentrates. Animal Production 59: 327–334.Google Scholar
Taylor, W. and Leaver, J. D. 1984. Systems of concentrate allocation for dairy cattle. 2. A comparison of two patterns of allocation for autumn-calving cows offered two qualities of grass silage ad libitum. Animal Production 39: 325–333.Google Scholar
Taylor, W. and Leaver, J. D. 1986. Systems of concentrate allocation for dairy cows. 4. A comparison of two amounts and two patterns of allocation. Animal Production 43: 17–26.Google Scholar
Thomas, C. and Rae, R. C. 1988. Concentrate supplementation of silage for dairy cows. In Nutrition and lactation of the dairy cow (ed. Garnsworthy, P. C.), pp. 327–354. Butterworths, London.CrossRefGoogle Scholar
Veerkamp, R. V., Simm, G. and Oldham, J. D. 1995. Genotype by environment interactions: experience from Langhill. In Breeding and feeding the high genetic merit dairy cow (ed. Lawrence, T. L. J., Gordon, F. J. and Carson, A.), occasional publication no. 19, British Society of Animal Science, pp. 59–66.Google Scholar