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Quantitative observations on pig embryos of known ages

  • A. W. Marrable (a1) and R. R. Ashdown
  • DOI:
  • Published online: 01 March 2009

1. The lengths and weights of 241 pig embryos, aged 26–109 days, were recorded; the pregnant sows were from a mixed herd of Landrace, Large White and Wessex stock and some of their crosses.

2. An empirical linear regression of length on age was estimated (equation 1); the relation between weight and age was represented by a polynomial weight and age was represented by a polynomial (equation 2).

We thank Mr A. S. Cray and the other directors of Unigate Ltd. for giving us the pigs; Mr P. Sedgewick of that Company gave us excellent co-operation. Prof. C. W. Ottaway and Dr P. Radford helped us throughout the investigation.

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L. G. Lowrey (1911). Prenatal growth of the pig. Am. J. Anat. 12, 107–38.

R. W. Pomeroy (1960). Infertility and neonatal mortality in the sow. III. Neonatal mortality and foetal development. J. agric. Sci., Camb. 54, 4156.

B. L. Warwick (1928). Prenatal growth of swine. J. Morph. 46, 5984.

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