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Modification of gestation length in cattle by the type of environment present at the end of pregnancy

  • A. G. Dickinson (a1)

Extract

The gestation lengths of cattle are considered in terms of variation due to the month in which calving occurs. The well-known summer decrease in gestation length is re-established but in addition there is a short-term decrease in April which appears to be related to the cattle being put out to grass at a late stage of pregnancy after they have been housed for the winter.

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Brakel, W. J., Rife, D. C., & Salisbury, S. M., 1952. Factors associated with the duration of gestation in dairy cattle. J. Dairy Sci., 35: 179.
Herman, H. A., & Spalding, R. W., 1947. A study of factors affecting the length of gestation in dairy cattle. J. Dairy Sci., 30: 545. (Soc. Proc.)
Howell, C. E., & Rollins, W. C, 1951. Environmental sources of variation in the gestation length of the horse. J. Anim. Sci., 10: 789.
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New Zealand Dairy Board, 1953. 29th Annual Report: p. 79.
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Signoret, J. P., Poly, J., & Vissac, B., 1956. Éitude statistique des causes de variation de quelques paramètres du cycle de reproduction des vaches laitières. I. La durée de gestation dans les races bovines normande et française frisonne pie noire. Ann. Zootech. (Paris), 5: 273.
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Terrill, C, & Hazel, L. N., 1947. Length of gestation in range sheep. Amer. J. vet. Res., 8: 66.
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Modification of gestation length in cattle by the type of environment present at the end of pregnancy

  • A. G. Dickinson (a1)

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