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Food, fibre and pharmaceuticals from animals
RESEARCH ARTICLE

Feeding concentrates based on individual cow requirements improves the yield of milk solids in dairy cows grazing restricted pasture

S. C. García A B , M. Pedernera A , W. J. Fulkerson A , A. Horadagoda A and K. Nandra A
+ Author Affiliations
- Author Affiliations

A MC Franklin Laboratory, Faculty of Veterinary Science, University of Sydney, Camden, NSW 2570, Australia.

B Corresponding author. Email: sgarcia@usyd.edu.au

Australian Journal of Experimental Agriculture 47(5) 502-508 https://doi.org/10.1071/EA05349
Submitted: 19 December 2005  Accepted: 27 July 2006   Published: 13 April 2007

Abstract

A grazing experiment involving 50 lactating Holstein–Friesian dairy cows was conducted to test the hypothesis that feeding concentrates (range 3–7 kg as fed/cow.day; average 5 kg/cow.day) to grazing cows based on individual (I) cow requirements would increase milk solids yield in comparison to fixed rate (F) allocation to the whole herd (average 5 kg/cow.day for all cows). The experiment comprised two sequential periods that differed only in the way maize silage was offered to cows (either 100% on a feed pad at night or 75% on a feed pad at night, with 25% in a paddock in the morning). Intake of individual cows was estimated using the 13C and n-alkanes method. The rumen degradability of the feeds (lucerne pasture, maize silage and commercial dairy pellets) was measured in parallel, using six rumen-fistulated sheep. Compared with cows in the F group, milk yield and milk fat yield for the I cows increased (P < 0.05) by 3.0 and 11.1%, respectively. As neither milk protein content nor milk protein yield was affected (P > 0.05) by treatment, total milk solids yield (milk fat plus milk protein) was 7.0% higher (P < 0.05) for I cows than for F cows. The increase in milk fat yield was presumably associated with an improved diet nutrient balance in the I cows, as indicated by a significant correlation between fibre intake and milk fat yield for cows in the I group but not for cows in the F group. This is also supported by the results of the rumen degradability of the feeds. In this study, higher-producing cows compensated for their higher requirements by increasing intake of maize silage, rather than pasture, as the former was the less restricted feed on offer. This highlights the importance of offering at least one feed to cows in a less restricted way, in order to enable high-producing cows in the herd to compensate for their higher intake requirements. In conclusion, under the conditions of the present study, feeding concentrates to cows based on individual cow requirements increased milk solids yield at no extra cost.

Additional keywords: concentrate allocation, forage restriction.


Acknowledgements

This study was carried out with resources from Elizabeth Macarthur Agricultural Institute (EMAI), DPI NSW and funded by The Dairy Industry Development Co. (NSW) Ltd (DIDCO). The authors wish to thank the former Farm Supervisor of No 9 Dairy at EMAI (Mr Terry Osborne) and all the farm staff for their assistance with the field experiment. Dairy Australia provided the fellowship for the first author.


References


Beever DE (1993) Rumen function. In ‘Quantitative aspects of ruminant digestion and metabolism’. (Eds JM Forbes, J France) pp. 187–215 (CAB International: Cambridge, UK)

Chamberlain AT, Wilkinson JM (1996) ‘Feeding the dairy cow.’ (Chalcombe Publications: Lincoln, UK)

Delaby L, Peyroud JL (1997) Influence of concentrate supplementation strategy on grazing dairy cows’ performance. In ‘Proceedings of the 18th international grassland conference’. pp. 29:137–138.

Dove H, Mayes RW (1991) The use of plant wax alkanes as marker substances in studies of the nutrition of herbivores: a review. Australian Journal of Agricultural Research 42, 913–952.
Crossref | GoogleScholarGoogle Scholar | open url image1

Farquhar GD, Ehleringer JR, Hubick KT (1989) Carbon isotope discrimination and photosynthesis. Annual Review of Plant Physiology and Plant Molecular Biology 40, 503–537.
Crossref | GoogleScholarGoogle Scholar | open url image1

Fulkerson WJ, Doyle P (2001) ‘The Australian dairy industry.’ (Department of Natural Resources and Environment: Melbourne)

García SC, Holmes CW (2005) Seasonality of calving in pasture-based dairy systems: its effects on herbage production, utilisation and dry matter intake. Australian Journal of Experimental Agriculture 45, 1–9.
Crossref | GoogleScholarGoogle Scholar | open url image1

García SC, Holmes CW, Hodgson J, MacDonald A (2000) The combination of the n-alkanes and 13C techniques to estimate individual dry matter intakes of herbage and maize silage by grazing dairy cows. Journal of Agricultural Science, Cambridge 135, 47–55.
Crossref | GoogleScholarGoogle Scholar | open url image1

Ingvartsen KL, Friggens NC, Faverdin P (1999) Food intake regulation in late pregnancy and early lactation. In ‘Metabolic stress in dairy cows. Occasional publication no. 24’. (Eds JD Oldham, G Simm, AF Groen, BL Nielsen, JE Pryce, TLJ Lawrance) pp. 37–54. (British Society of Animal Science: Edinburgh, UK)

Jones RJ, Ludlow MM, Troughton JH, Blunt CG (1979) Estimation of the proportion of C3 and C4 plant species in the diet of animals from the ratio of natural 12C and 13C isotopes in the faeces. Journal of Agricultural Science, Cambridge 92, 91–100. open url image1

Machado CF (2004) Field and modelling studies of the effect of herbage allowance and maize grain feeding on animal performance in beef cattle finishing systems. PhD Thesis, Massey University, Palmerston North, New Zealand.

Mayne CS, Gordon FJ (1995) Implications of genotype × nutrition interactions for efficiency of milk production systems. In ‘Breeding and feeding the high genetic merit dairy cow. Occasional publication no. 19’. (Eds TLJ Lawrence, FJ Gordon, A Carson) pp. 67–77. (British Society of Animal Science: Edinburgh, UK)

Mayes RW, Lamb CS, Colgrove PM (1986) The use of dosed and herbage n-alkanes as markers for the determination of herbage intake. Journal of Agricultural Science, Cambridge 107, 161–170. open url image1

Ørskov ER (1987) ‘The feeding of ruminants: principles and practice.’ (Chalcombe Publications: Lincoln, UK)

Ørskov ER, McDonald I (1979) The estimation of protein degradability in the rumen from incubation measurement weighted according to rate of passage. Journal of Agricultural Science, Cambridge 92, 499–503. open url image1

Pecsok SR, McGilliard ML, James RE (1992) Estimating production benefits through simulation of group and individual feeding of dairy cows. Journal of Dairy Science 75, 1604–1615.
PubMed |
open url image1

SCA (1990) ‘Feeding standards for Australian livestock. Ruminants.’ (CSIRO Publishing: Melbourne) 266 pp.

Smith D (1969) College of Agriculture and Life Sciences, University of Wisconsin, Research Division, Research Report No. 41. 11 pp.

Taylor W, Leaver JD (1984) Systems of concentrate allocation for dairy cattle. 1. A comparison of three patterns of allocation for autumn-calving cows and heifers offered grass silage ad libitum. Animal Production 39, 315–324. open url image1

Thomas C, Leach KA, Logue DN, Ferris C, Phipps RH (1999) Management options to reduce load. In ‘Metabolic stress in dairy cows. Occasional publication no. 24’. (Eds JD Oldham, G Simm, AF Groen, BL Nielsen, JE Pryce, TLJ Lawrance) pp. 129–139. (British Society of Animal Science: Edinburgh, UK)

Tilley JMA, Terry RA (1963) A two-stage technique for the in vitro digestion of forage crops. Journal of the British Grassland Society 18, 104–111. open url image1

Van Soest PJ, Robertson JB, Lewis BA (1991) Methods for dietary fiber, neutral detergent fiber, and nonstarch polysaccharides in relation to animal nutrition. Journal of Dairy Science 74, 3583–3597.
PubMed |
open url image1