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Environmental and managerial factors affecting the growth of Friesian heifers from six months of age to calving

Published online by Cambridge University Press:  27 March 2009

B. Ridler  and
W. H. Broster
B. Ridler
Affiliation:
National Institute for Research in Dairying, University of Reading
W. H. Broster
Affiliation:
National Institute for Research in Dairying, University of Reading
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Summary

The growth of 120 Friesian heifers born into one herd over a period of 12 years was studied for the period from 6 months of age to calving at about 30–35 months of age. Live weights were recorded weekly and rates of live-weight gain were calculated for each 3-month period for each animal. Δt 6, 12, 18, and 24 months of age the heifers weighed 360, 590, 800 and 950 lb. The coefficients of variation of live weight did not vary with age and averaged ±10·0%. Coefficients of variation of live-weight gain increased from ± 20% at 6–9 months of age to ±60% at 24–27 months of age. Growth rate declined by 0·02 lb/day from 12 months to 30 months of age for animals under constant managerial conditions. Heifers wintered indoors grew faster than those wintered outdoors. The growth of younger animals was decreased more by outdoor wintering (a reduction of 0·6 lb/day at 15 months) than was the growth rate of older animals (a reduction of 0·3 lb/day at 21 months of age). When live-weight gain was low in winter there was marked compensatory growth at grass the following summer. Pregnant heifers grew 0·1 lb/day faster in early pregnancy and 0·6 lb/day faster in the last 4 months of pregnancy than did barren heifers.

There was no appreciable difference between the live-weight gain of spring- and autumn-born heifers. With an autumn calving policy spring-born heifers were served and conceived 135 days earlier and weighed 106 lb less at calving than did autumn-born heifers. There was little difference in the milk yield of the two groups in 305 days of the first lactation.

The regression equation of live weight (lb) on age (months) to 3rd calving was W = 1449 – 2027 e-0·042t. It was concluded that in the interests of economic rearing the dairy farmer could with advantage exercise greater control of the relationship between nutrition and growth during high cost winter periods and low cost summer periods.

Type
Research Article
Information
The Journal of Agricultural Science , Volume 71 , Issue 1 , August 1968 , pp. 81 - 90
Copyright
Copyright © Cambridge University Press 1968

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References

Anon. (1961). Nutritive value of grass. Rep. natn Inst. Res. Dairy, p. 49.Google Scholar
Anon. (1965). Variability of growth rate of young cattle. Rep. natn. Inst. Res. Dairy, p. 46.Google Scholar
Bailey, G. L., Balch, C. C. & Murdoch, J. C. (1955). The digestibility and feeding value of a lucerne/timothy sward. J. Br. Grassld Soc. 10, 27–34.CrossRefGoogle Scholar
Bailey, G. L. & Broster, W. H. (1957). Experiments on the nutrition of the dairy heifer. I. Protein requirements of yearling stock. J. agric. Set., Camb. 49, 435–45.CrossRefGoogle Scholar
Bailey, G. L., Broster, W. H. & Burt, A. W. A. (1958). Experiments on the nutrition of the dairy heifer. II. Experimental methods in short-term experiments. J. agric. Sci., Camb. 50, 1–7.CrossRefGoogle Scholar
Balch, C. C., Broster, W. H., Rook, J. A. F. & Tuck, V. J. (1965). The effect on growth rate and on milk yield and composition of finely grinding the hay, and cooking/flaking the maize in mixed diets for growing and for milking heifers. J. Dairy Res. 32, 1–11.CrossRefGoogle Scholar
Bartlett, S. & Broster, W. H. (1958). Feeding trials with ammoniated molasses in the diet of young dairy cattle. J. agric. Sci., Camb. 50, 60–3.CrossRefGoogle Scholar
Bianga, W. & Blaxter, K. L. (1961). The influence of the environment on animal production and health under housing conditions. Proc. 8th Int. Congr. Anim. Prod. Hamburg. General Reports 113–47.Google Scholar
Blaxter, K. L. & Price, H. A. (1946). Experiments on the use of home-grown foods for milk production. V. The protein requirements of growing dairy heifers. J. agric. Sci., Camb. 36, 301–9.CrossRefGoogle Scholar
Brody, S. (1945). Bioenergetics and Growth. New York: Reinhold Publ. Corp.Google Scholar
Broster, W. H. & Tuck, V. J. (1967). Experiments on the nutrition of the dairy heifer. VI. The effect on milk production of the level of feeding during the last six months of pregnancy and the first eight weeks of lactation. J. agric. Sci., Camb. 69, 465–77.CrossRefGoogle Scholar
Broster, W. H., Sutton, J. D., Tuck, V. J. & Balch, C. C. (1965). The effect of the addition of large amounts of cod-liver oil to the rations of yearling heifers on their rate of liveweight gain. J. agric. Sci., Camb. 65, 227–32.CrossRefGoogle Scholar
Broster, W. H., Tuck, V. J. & Balch, C. C. (1963a). Effect of rationing grass on the growth rate of dairy heifers and on output per acre, with a note on its significance in experimental design. J. agric. Sci., Camb. 60, 371–80.CrossRefGoogle Scholar
Broster, W. H., Tuck, V. J. & Balch, C. C. (1963b). Experiments on the nutrition of the dairy heifer IV. Protein requirements of 2-year-old heifers. J. agric. Sci., Camb. 60, 393–8.CrossRefGoogle Scholar
Broster, W. H., Tuck, V. J. & Balch, C. C. (1964). Experiments on the nutrition of the dairy heifer. V. Nutrition in late pregnancy. J. agric. Sci., Camb. 63, 51–8.CrossRefGoogle Scholar
Burt, A. W. A. (1956). The influence of level of feeding during rearing and in late pregnancy upon the productivity of the dairy cow. Dairy Sci. Abstr. 18, Cols. 883–94.Google Scholar
Crichhton, J. A., Aitken, J. N. & Boyne, A. W. (1960). The effect of plane of nutrition during rearing on growth, production, reproduction and health of cattle. III. Milk production during first three lactations. Anim. Prod. 2, 159–68.CrossRefGoogle Scholar
Dinsdale, D. H. & Winter, T. (1956). The cost of rearing dairy heifers from birth to calving. Univ. Durh. Farm Economics Branch, Rep. no. G 53.Google Scholar
Evans, W. M. R. (1964). The influence of four planes of nutrition during rearing on the productivity of the dairy cow. Expl Husb. 10, 1–12.Google Scholar
Hodges, J., O'Connor, L. K. & Clark, W. M. (1960).The size of dairy heifers. Anim. Prod. 2, 187–95.Google Scholar
McCandlish, A. C. (1922). Studies in the growth and nutrition of dairy calves. J. Dairy Sci. 5, 301–20.CrossRefGoogle Scholar
Phillips, R. (1946). Seasonal variation in the rate of growth of young cattle. Nature, Lond. 158, 202–3.CrossRefGoogle ScholarPubMed
Ridler, B., Broster, W. H. & Foot, A. S. (1963).The growth rate of heifers in a dairy herd. J. agric. Sci., Camb. 61, 1–8.CrossRefGoogle Scholar
Roy, J. H. B. & Shillam, K. W. G. (1954). Spring calves can be weaned on to grass. Fmr Stk-Breed. 68, (3356), 71.Google Scholar
Snedecor, G. (1956). Statistical Methods. Ames, U.S.A.:Iowa State University Press.Google Scholar
Taylor, J. C. & Lonsdale, C. R. (1967). Grass for young cattle. Mimeograph. Grassland Research Institute, Hurley, Berkshire.Google Scholar
Taylor, C. (1961). Compensatory growth and its measurement in fattening cattle grazing spring pasture. Proc. 8th Int. Congr. Anim. Prod. Hamburg. Points for Discussion, p. 32.Google Scholar
Taylor, St C. S. & Young, G. B. (1966). Variation in growth and efficiency in twin cattle with live weight and food intake controlled. J. agric. Sci., Camb. 66, 67–86.CrossRefGoogle Scholar
Westmacott, M. A. (1959). Rearing dairy heifers on different planes of nutrition. Expl Husb. 4 51–7.Google Scholar
Williams, E. J. (1959). Regression Analysis. New York: John Wiley and Sons Inc.Google Scholar