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Lactation curves for several US sheep breeds

Published online by Cambridge University Press:  02 September 2010

H. Sakul  and
W. J. Boylan
H. Sakul
Affiliation:
Department of Animal Science, University of Minnesota, St Paul, MN 55108, USA
W. J. Boylan
Affiliation:
Department of Animal Science, University of Minnesota, St Paul, MN 55108, USA
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Abstract

Lactation curves for several dairy traits in sheep were studied. Data were collected from seven pure breeds, three synthetic breeds and twelve single breed crosses in a 5-year milking trial. Wood's lactation model (yn = anbe-cn) was used to describe the lactation curves. Actual and fitted lactation curves had the same shape within each trait except for proportion of lactose. Correlations between actual and fitted lactation curves ranged from 0·92 to 0·99 for all traits except lactose (0·24). There was no apparent explanation for the low correlation for lactose content. It was concluded that the algebraic formula can be used to obtain estimates of parameters for sheep lactation curves. However, some caution should be exercised in extending results to proportion of lactose in the milk.

Crossbred groups had higher total milk production than pure and synthetic breeds. Lactation curves for crossbred ewes, grouped by breed of sire, had a similar pattern. Finnsheep and Rambouillet-sired crossbred ewes produced proportionately 0·23 more milk than ewes sired by Dorset and Lincoln rams. Breed differences in total milk production were observed among the pure breeds. The Suffolk breed was superior in milk production. All breeds, except the Romanov, followed a similar pattern for lactation curves. The Romanov breed produced milk at a relatively low but consistent level throughout the lactation trial.

Keywords

sheep breedslactation curve
Type
Research Article
Information
Animal Production , Volume 54 , Issue 2 , April 1992 , pp. 229 - 233
Copyright
Copyright © British Society of Animal Science 1992

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References

Boylan, W. J. and Dangi, K. S. 1984. Variation in milk production of sheep. Journal of Animal Science 59: suppl. 1, 80 (abstr.).Google Scholar
Congleton, W. R. and Everett, R. W. 1980. Application of the incomplete gamma function to predict cumulative milk production. Journal of Dairy Science 63: 109–119.CrossRefGoogle Scholar
Keown, J. F., Everett, R. W., Empet, N. B. and Wadell, L. H. 1986. Lactation curves. Journal of Dairy Science 69: 769–781.CrossRefGoogle Scholar
Lawlor, M. J., Louca, A. and Mavrogenis, A. 1974. The effect of three suckling regimes on the lactation performance of Cyprus fat-tailed, Chios and Awassi sheep and the growth rate of the lambs. Animal Production 18: 293–299.Google Scholar
Owen, J. B. 1957. A study of the lactation and growth of hill sheep in their native environment and under lowland conditions. Journal of Agricultural Science 48: 387–412.CrossRefGoogle Scholar
Peart, J. N., Edwards, R. A. and Donaldson, E. 1972. The yield and composition of the milk of Finnish Landrace × Blackface ewes. I. Ewes and lambs maintained indoors. Journal of Agricultural Science, Cambridge 79: 303–313.CrossRefGoogle Scholar
Torres-Hernandez, G. and Hohenboken, W. 1980. Relationships between ewe milk production and composition and preweaning lamb weight gain. Journal of Animal Science 50: 598–603.CrossRefGoogle Scholar
Wood, P. D. P. 1967. Algebraic model of the lactation curve in cattle. Nature, London 216: 164–165.CrossRefGoogle Scholar
Wood, P. D. P. 1976. Algebraic models of the lactation curves for milk, fat and protein production, with estimates of seasonal variation. Animal Production 22: 35–40.Google Scholar