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Factors affecting water intakes of lactating dairy cows offered grass silages differing in fermentation and intake characteristics

Published online by Cambridge University Press:  02 September 2010

R. J. Dewhurst ,
N. W. Offer  and
C. Thomas
R. J. Dewhurst
Affiliation:
Grassland and Ruminant Science Department, Scottish Agricultural College, Auchincruive, Ayr KA6 5HW
N. W. Offer
Affiliation:
Grassland and Ruminant Science Department, Scottish Agricultural College, Auchincruive, Ayr KA6 5HW
C. Thomas
Affiliation:
Grassland and Ruminant Science Department, Scottish Agricultural College, Auchincruive, Ayr KA6 5HW
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Abstract

The objective of this study was to investigate the effects of silage characteristics on water intake of lactating dairy cows and to examine the prediction of water intake. Sixteen grass silages, differing in fermentation and intake characteristics, were offered ad libitum to dairy cows in early lactation supplemented with 7 kg/day of concentrate (13·3 MJ metabolizable energy per kg dry matter (DM) and 216 g crude protein per kg DM). Four silages were offered in each of four incomplete change-over design experiments, consisting of three 3-week periods. Water intakes were recorded through individual Kent water meters and press water bowls over the final week of each period. Tree (drinking) water intake ranged from 20·1 to 89·9 (mean = 45·2; s.d. = 12·96) I/day whilst total water intake (also including food water) ranged from 48·4 to 123·8 (mean = 87·3; s.d. = 14·12) I/day. Water intake increased with increasing silage DM concentration, however free water replaced silage water at a rate less than 1. Milk yield and silage D value (digestible organic matter, g/kg DM) were strongly positively correlated with free water intake (r = 0·751 and 0·595 respectively), though fermentation indices were not good single predictors of water intake. Further analysis revealed problems owing to collinearity within the predictors of water intake: DM intake, silage D value and milk yields being significantly correlated, as were pH and volatile fatty acids as a proportion of total fermentation acids. The ridge regression technique was used to reduce collinearity problems and produce stable equations. The best prediction equations for water intake involved a combination of both animal and analytical information: diet DM concentration, milk yield and silage pH. The use of fermentation information, whether from titration or high-performance liquid chromatography did not describe real variation in water intake beyond that described by silage pH. Free water intake was higher with higher diet DM concentrations, higher milk yields and higher silage pH.

Keywords

dairy cowsgrass silagemilk yieldsilage fermentationwater intake
Type
Research Article
Information
Animal Science , Volume 66 , Issue 3 , June 1998 , pp. 543 - 550
Copyright
Copyright © British Society of Animal Science 1998

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References

Refernces

Agricultural Research Council. 1980. Nutrient requirements of ruminant livestock. Commonwealth Agricultural Bureaux, Slough.Google Scholar
Barber, G. D., Givens, I., Kridis, M. S., Offer, N. W. and Murray, I. 1989. Prediction of the organic matter digestibility of grass silage. Animal Feed Science arid Technology 28: 115–128.CrossRefGoogle Scholar
Castle, M. E. and Thomas, T. P. 1975. The water intake of British Friesian cows on rations containing various forages. Animal Production 20: 181–189.Google Scholar
Dewar, W. A. and McDonald, P. 1961. Determination of dry matter in silage by distillation with toluene. Journal of the Science of Food and Agriculture 12: 790–795.CrossRefGoogle 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
Holter, J. B. and Urban, Jr W. E. 1992. Water partitioning and intake prediction in dry and lactating Holstein cows. Journal of Dairy Science 75: 1472–1479.CrossRefGoogle ScholarPubMed
Lawes Agricultural Trust. 1995. Genstat 5 reference manual. Clarendon Press, Oxford.Google Scholar
Little, W. and Shaw, S. R. 1978. A note on the individuality of the intake of drinking water by dairy cows. Animal Production 26: 225–227.Google Scholar
Ministry of Agriculture, Fisheries and Food. 1992. Prediction of the energy values of compound feedingstuffs for farm animals. Summary of recommendations of a working party sponsored by the Ministry of Agriculture, Fisheries and Food.Google Scholar
Minitab Incorporated. 1980. Minitab data analysis software. Pennsylvania State University, Pennsylvania.Google Scholar
Murphy, M. R. 1992. Water metabolism of dairy cattle. Journal of Dairy Science 75: 326–333.CrossRefGoogle ScholarPubMed
Murphy, M. R., Davis, C. L. and McCoy, G. C. 1983. Factors affecting water consumption by Holstein cows in early lactation. Journal of Dairy Science 66: 35–38.CrossRefGoogle ScholarPubMed
Offer, N. W., Rooke, J. A., Dewhurst, R. J. and Thomas, C. 1993. Rapid assessment of silage fermentation characteristics by electrometric titration. Animal Production 56: 423 (abstr.).Google Scholar
Paquay, R., De Baere, R. and Lousse, A. 1970. Statistical research on the fate of water in the adult cow. II. The lactating cow. Journal of Agricultural Science, Cambridge 75: 251–255.CrossRefGoogle Scholar
Rook, A. J. and Dhanoa, M. S. 1995. Procedure ‘RIDGE‘. In Genstat 5 procedure library manual, release 3[3] (ed. Payne, R. W. and Arnold, G. M.). Numerical Algorithms Group, Oxford.Google Scholar
Rook, A. J., Dhanoa, M. S. and Gill, M. 1990. Prediction of the voluntary intake of grass silages by beef cattle. 2. Principal component and ridge regression analysis. Animal Production 50: 439–454.Google Scholar
Sekine, J. and Asahida, Y. 1987. A note on the effect of the dry-matter concentration in forages on water consumption of yearling steers. Animal Production 45: 527–529.Google Scholar
Stockdale, C. R. and King, K. R. 1983. A note on some of the factors that affect the water consumption of lactating cows at pasture. Animal Production 36: 303–306.Google Scholar
Van Soest, P. J., Robertson, J. B. and Lewis, B. A. 1991. Methods for dietary fiber, neutral detergent fiber and nonstarch polysaccharides in relation to animal nutrition. Journal of Dairy Science 74: 3568–3597.CrossRefGoogle ScholarPubMed
Van Soest, P. J. and Wine, R. H. 1967. Use of detergents in the analysis of fibrous feeds. IV. Determination of plant cell wall constituents. Journal of the Association of Official Analytical Chemists 50: 50–55.Google Scholar
Woodford, S. T. and Murphy, M. R. 1988. Dietary alteration of particle breakdown and passage from the rumen in lactating dairy cattle. Journal of Dairy Science 71: 687–696.CrossRefGoogle ScholarPubMed