Open AccessInfluence of time of hatching on sexual maturity of pullets in Puerto Rico
Author(s) -
A. González-Chapel,
M. Rojas Daporta
Publication year - 1951
Publication title -
the journal of agriculture of the university of puerto rico/the journal of agriculture of the university of puerto rico
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.123
H-Index - 10
eISSN - 2308-1759
pISSN - 0041-994X
DOI - 10.46429/jaupr.v35i3.12808
Subject(s) - sexual maturity , hatching , maturity (psychological) , biology , zoology , demography , psychology , ecology , developmental psychology , sociology
This study included the sexual maturity of 1,372 pullets of different breeds and crossbreds hatched from February G to June 5 in 1946, 1947, 1948 and 1949. Time of hatching was found to exert an important influence on the sexual maturity of pullets in Puerto Rico. Pullets hatched in February had earlier sexual maturity than pullets hatched in March. In most of the groups of birds studied, a curvilinear trend was apparent showing that birds hatched in May had earlier sexual maturity than those hatched in April. A series of graphs showing the regression of sexual maturity on time of hatching, by breeds and by years, are presented.