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STUDIES ON THE SEX‐RATIO AND RELATED PHENOMENA
Author(s) -
PARKES A. S.
Publication year - 1923
Publication title -
annals of applied biology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.677
H-Index - 80
eISSN - 1744-7348
pISSN - 0003-4746
DOI - 10.1111/j.1744-7348.1923.tb05675.x
Subject(s) - sex ratio , biology , litter , affect (linguistics) , statistics , ecology , demography , mathematics , population , communication , sociology
Summary.1 The existing work on the influence of the litter size on the sex‐ ratio shows very erratic results, and the new work embodied in this paper is rather more coherent. 2 It is clear, however, that multiple births in animals which are normally polytocus are somewhat different from multiple births in animals which are normally monotocus. 3 Before any attempt can be made to arrive a t the nature of the influence of the size of litter on the sex‐ratio it is essential to consider the factors which govern the size of the litter. Hammond(1) has shown that the number of eggs fertilised and the amount of foetal elimination are the two main factors controlling the size of litter. The first of these factors can scarcely affect the sex‐ratio, while the second, on the other hand, very well may have such an influence. 4 In view of the complexity of the interaction of these two factors any great coherence in the resulting sex‐ratio could hardly be expected.