Observations on the term of utero-gestation : with a view of correcting the opinions generally entertained in respect to protacted gestation, etc / by Charles Clay.

  • Charles Clay
Date:
1855
Catalogue details

Licence: Public Domain Mark

Credit: Observations on the term of utero-gestation : with a view of correcting the opinions generally entertained in respect to protacted gestation, etc / by Charles Clay. Source: Wellcome Collection.

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    In this table there is no statement of the age of the male, though it is well known there is seldom much difference in this respect in domestic animals. It is only human beings that indulge in the unnatural disparities of age. Simon Winteb gives the following on mares. 8 foaled at 8 8 1 }} }> 840 days. 842 843 346 This table gives no ages, and is only of value to show that the term varies; but fails to prove from what cause,this varia¬ tion is but slight, probably arising from trifling differences as to age. The same may be said of the following from Brugnone. Results of 55 mares. Days. Days. Days. 1 . . 273 1 . . 339 1 . . 348 1 . . 307 3 . . 340 2 . . 351 2 . . 330 1 . . 341 2 . . 352 2 . . 333 3 . . 342 1 . . 353 2 . . 334 2 . . 344 1 . . 356 2 . . 335 3 . . 345 1 . . 357 4 . . 336 4 . . 346 1 . . 369 2 . 2 . . 337 . 338 4 . . 347 1 . . 389 Thus exhibiting a difference of two months and a half between shortest and longest period. Tessier found in 200 mares a difference of 83 days. In the Journal d’Economie rurale Beige, in a large table ol experiments, a difference of 97 days was found. M. Grille in 114 mares found a difference of 93 days. Lord Spencer in 764 cows found the shortest gestative period 220 days, the mean average 285 days, youngest having shortest term, and the old ones the longest term.
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