154 



PRINCIPLES OF VETERINARY SCIENCE 

 Gestation Table (Continued) 





Date on which animal may be expected to give birth 



Date of service 



Mare 



Cow 



Sow 



Ewe 



Aug. 24 



Aug. 29 



Sept. 3 



Sept. 8 



July 26 

 July 31 

 Aug. 5 

 Aug. 10 

 Aug. 15 

 Aug. 20 

 Aug. 25 

 Aug. 30 

 Sept. 4 

 Sept. 9 

 Sept. 14 

 Sept. 19 

 Sept. 24 

 Sept. 29 

 Oct. 4 

 Oct. 9 

 Oct. 14 

 Oct. 19 

 Oct. 24 

 Oct. 29 

 Nov. 3 

 Nov. 8 

 Nov. 13 

 Nov. 18 

 Nov. 23 

 Nov. 28 



June 1 

 June 6 

 June 1 1 

 June 16 

 June 21 

 June 26 

 July 1 

 July 6 

 July 11 

 July 16 

 July 21 

 July 26 

 July 31 

 Aug. 5 

 Aug. 10 

 Aug. 15 

 Aug. 20 

 Aug. 25 

 Aug. 30 

 Sept. 4 

 Sept. 9 

 Sept. 14 

 Sept. 19 

 Sept. 24 

 Sept. 29 

 Oct. 4 



Dec. 14 

 Dec. 19 

 Dec. 24 

 Dec. 29 

 Jan. 3 

 Jan. 8 

 Jan. 13 

 Jan. 18 

 Jan. 23 

 Jan. 28 

 Feb. 2 

 Feb. 7 

 Feb. 12 

 Feb. 17 

 Feb. 22 

 Feb. 27 

 March 4 

 March 9 

 March 14 

 March 19 

 March 24 

 March 29 

 April 3 

 April 8 

 April 13 

 April 18 



Jan. 18 

 Jan. 23 

 Jan. 28 

 Feb. 2 



Sept. 13 



Sept. 18 



Sept. 23 



Feb. 7 

 Feb. 12 

 Feb. 17 



Sept. 28 



Feb. 22 



Oct. 3 



Feb. 27 



Oct. 8 





Oct. 13 



Oct. 18 



Oct. 23 



Oct. 28 



March 9 

 March 14 

 March 19 

 March 24 



Nov. 2 



March 29 



Nov. 7 



April 3 



Nov. 12 



1 April 8 



Nov. 17 



April 13 



Nov. 22 



| April 18 



Nov. 27 



April 23 



Dec. 2 



April 28 



Dec. 7 



May 3 



Dec. 12 



May 8 



Dec. 17 



May 13 



Dec. 22 



May 18 



Dec. 27 



May 23 







great majority of cases the fetuses of the larger animals are pre- 

 sented head first, although posterior presentations are not 

 uncommon (Fig. 52). 



The strain incident to the development of twins is so great 

 in the mare that abortion or premature birth occurs in about 90 

 per cent, of the cases, or the foals are so weak and small that they 

 fail to thrive. The cow may have twins, triplets or quadruplets, 

 all of which may be carried full time and develop to maturity. 



At no time of life is the growth of the animal nearly so rapid 

 as it is during the period spent in the womb. Growth of the 

 fetus is more rapid during some stages than others and may be 

 interrupted temporarily by disturbances in the nutrition of the 

 mother. The length of the fetus is the safest guide in the deter- 

 mination of its age. 



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