A Phylogenetic Study of Cycads (1915)(en)(5s) by Chamberlain C.J.

By Chamberlain C.J.

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SCHOTT suggests that there may exist a correlation between blood groups on the one hand and fertility and weight of pigling on the other. Further, he states that Mendelian laws appear to apply to the blood groups of the pig. SCHERMER and KAEMPFFER (1932) carried out experiments to ascertain the mode of inheritance of blood groups in the pig, using the Hannover Improved Landschwein breed. ;::~ ~ Parents ·s Ao cO ..... 0 Z Ao Ao Ao OIX OIX X X X X X Total Ao OIX 00 OIX 00 , +> 0 No. vu v bO cO No.

2 74% 67% 73% 69% 65% 69% of the mortality occurred during the first week of life. STAHL (1930) and JOHANSSON (1931) both give figures for postnatal mortality. JOHANSSON'S figures, which are based on 1,671 litters from forty-nine herds of Swedish Large White pigs, are as follows: 47 SEX Age of sows (expressed by the consecutive number of litters) in relation to size of litter at birth, weight of living pigs at three weeks of age, and death rate in litters during the first three weeks after birth.

WARWICK (J 927) examined the uteri of 448 sows which where unfortunately of unknown breeding. 68 per cent. of the foetuses observed were in various stages of degeneration, with more or less resorption. Overcrowding could not completely explain this condition, as degenerating embryos were found where there was no evidence of overcrowding. Genetic causes were suggested. CREW (1925) observed a higher male than female prenatal mortality. DAVIDSON'S (1930) work is also of interest. He fed calcium and protein deficient rations to two groups of 6 gilts in each group.

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