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A simulation study of the effects of the calving interval on milk yields of dairy cows in fixed time periods

Published online by Cambridge University Press:  02 September 2010

A. Genizi ,
H. Schindler ,
S. Amir ,
S. Eger ,
M. Zarchi  and
R. H. Foote
A. Genizi
Affiliation:
Department of Statistics and Operations Research, Agricultural Research Organization, The Volcani Center, Israel
H. Schindler
Affiliation:
Institute of Animal Science, Agricultural Research Organization, The Volcani Center, Israel
S. Amir
Affiliation:
Institute of Animal Science, Agricultural Research Organization, The Volcani Center, Israel
S. Eger
Affiliation:
Extension Service, Ministry of Agriculture, Israel
M. Zarchi
Affiliation:
Department of Statistics and Operations Research, Agricultural Research Organization, The Volcani Center, Israel
R. H. Foote
Affiliation:
Department of Animal Science, Cornell University, NY, USA
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Abstract

Multiparous cows were assigned before calving to three calving to first insemination intervals. Records of cows conceiving at first or second insemination, were used to construct a model of the lactation curve which incorporated peak production and the effect of progressing pregnancy. The model was used to simulate milk yield during a 4-year period for three production levels and five calving intervals. The model separated the descending part of the lactation curve into a linearly and an exponentially declining component, with the latter becoming distinct at about 20 weeks after conception. Peak yield was negatively correlated with the slope of the linear decline. Within a simulated 4-year period, cumulative milk yields at fixed time periods after calving depended upon the period chosen and the calving-to-conception interval of the cow. Late conceptions resulted in higher cumulative yields at the end of the 1st year, and in lower yields at the 2nd year end, with respect to early conceptions. Smaller differences were found between the intermediate calving intervals. During the 3rd and 4th years the early conceptions had a distinct advantage. Different rates of the linear decline, obtained for the different production levels, changed the magnitude of the yield differences between the calving intervals but not their relative ranking. The model presented offers a means for the suitable choice of the calving cycle according to the length of the period for which a cow is expected to remain in the herd.

Keywords

calving intervaldairy cowslactation curvemathematical modelsmilk yield
Type
Research Article
Information
Animal Production , Volume 55 , Issue 3 , December 1992 , pp. 309 - 314
Copyright
Copyright © British Society of Animal Science 1992

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References

Bar-Anan, R. and Genizi, A. 1981. The effects of lactation, pregnancy and calendar month on milk records. Animal Production 33: 281–290.Google Scholar
Bar-Anan, R. and Soller, M. 1979. The effect of days open on milk yield and on breeding policy post partum. Animal Production 29: 109–119.Google Scholar
Bauman, D. E. and Currie, B. W. 1980. Partitioning of nutrients during pregnancy and lactation: a review of mechanisms involving homeostasis and homeorhesis. Journal of Dairy Science 63: 1514–1529.CrossRefGoogle ScholarPubMed
Bauman, D. E., McCutcheon, S. N., Steinhour, W. D., Eppard, P. J. and Sechen, S. J. 1985. Sources of variation and prospects for improvement of productive efficiency in the dairy cow: a review. Journal of Animal Science 60: 583–592.CrossRefGoogle ScholarPubMed
Cobby, J. M. and Le Du, Y. L. P. 1978. On fitting curves to lactation data. Animal Production 26: 127–133.Google Scholar
Dhanoa, M. S. and Le Du, Y. L. P. 1982. A partial adjustment model to describe the lactation curve of a dairy cow. Animal Production 34: 243–247.Google Scholar
Elston, D. A., Glasbey, C. A. and Neilson, D. R. 1989. Non-parametric lactation curves. Animal Production 48: 331–339.Google Scholar
Foote, R. H. 1978. Reproductive performance and problems in New York dairy herds. Search: Agriculture 8(2). Ithaca, NY.Google Scholar
Harrison, D. S., Meadows, C. E., Boyd, L. J. and Britt, J. H. 1974. Effects of interval to first service on reproduction, lactation and culling in dairy cows. Journal of Dairy Science 57: 628 (abstr.).Google Scholar
Heimann, M. 1984. Results of an integrative computer program of fertility and production data from AI cattle population. Proceedings of the tenth international congress animal reproduction and artificial insemination, Urbana-Champaign, Illinois, vol. 1, p. 368.Google Scholar
James, A. D. and Esslemont, R. J. 1979. The economics of calving intervals. Animal Production 29: 157–162.Google Scholar
Kalay, D. 1976. Achieving a calving interval of one year by means of early insemination after parturition. Proceedings of the eighth international congress on animal reproduction artificial insemination, Krakow, vol. 1, p. 123.Google Scholar
Lamb, R. C. and Kopland, D. V. 1963. Influence of age at first calving and calving interval on production per day of life and total lifetime production. Journal of Dairy Science 46: 620 (abstr.).Google Scholar
Louca, A. and Legates, J. E. 1968. Production losses in dairy cattle due to days open. Journal of Dairy Science 51: 573–583.CrossRefGoogle Scholar
National Research Council. 1978. Nutrient requirements of dairy cattle. 5th ed. National Academy of Sciences, Washington, DC.Google Scholar
Olds, D., Cooper, T. and Thrift, F. A. 1979. Effect of days open on economic aspects of current lactation. Journal of Dairy Science 62: 1167–1170.CrossRefGoogle Scholar
Oltenacu, P. A., Rounsaville, T. R., Milligan, R. A. and Foote, R. H. 1981. Systems analysis for designing reproductive management programs to increase production and profit in dairy herds. Journal of Dairy Science 64: 2096–2104.CrossRefGoogle Scholar
Oltenacu, P. A., Rounsaville, T. R., Milligan, R. A. and Hintz, R. L. 1980. Relationship between days open and cumulative milk yield at various intervals from parturition for high and low producing cows. Journal of Dairy Science 63: 1317–1327.CrossRefGoogle Scholar
Schindler, H., Eger, S., Amir, S., Schermerhorn, E. C. and Foote, R. H. 1990. [Influence of length of calving intervals on milk yield and ways for its analysis.] Hassedeh 70: 752–754.Google Scholar
Schindler, H., Eger, S., Davidson, M., Ochowski, D., Schermerhorn, E. C. and Foote, R. H. 1991. Factors affecting response of groups of dairy cows managed for different calving-conception intervals. Theriogenology 36: 495–503.CrossRefGoogle ScholarPubMed
Schmidt, G. H. and Van Vleck, L. D. 1974. Selection for milk yield and herd life. In Principles of dairy science, pp. 276–280. Freeman, San Francisco.Google Scholar
Schneider, F., Shelford, J. A., Peterson, R. G. and Fisher, L. J. 1981. Effects of early and late breeding of dairy cows on reproduction and production in current and subsequent lactation. Journal of Dairy Science 64: 1996–2002.CrossRefGoogle Scholar
Spedding, C. R. W., Walsingham, J. M. and Hoxey, A. M. 1981. Biological efficiency in agriculture. Academic Press, London.Google Scholar
Speicher, J. A. and Meadows, C. E. 1967. Milk production and costs associated with length of calving interval of Holstein cows. Journal of Dairy Science 50: 975 (abstr.).Google Scholar
Weller, J. I., Bar-Anan, R. and Osterkorn, K. 1985. Effects of days open on annualized milk yields in current and following lactations. Journal of Dairy Science 68: 1241–1249.Google ScholarPubMed
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
Wood, P. D. P. 1985. Importance of the calving interval to milk yield in the following lactation of British Friesian cows. Journal of Dairy Research 52: 1–8.CrossRefGoogle Scholar