Abstract

Selection for increasing testis weight in mice resulted in a 
considerable direct response. The rise in ovulation rates was also 
observed in selection lines. Yet, it was not accompanied by an in
crease in litter size, because of greater fetus losses in these 
lines. Oneof the indirect effects of selection was the increase in 
placenta weight and placenta volume on the 18th day of pregnancy.
It was particularly significant in the line which had the highest testis weight.
 

E. Wirth-Dzieciolowska, E. Martyniuk

Proceedings of the World Congress on Genetics Applied to Livestock Production, Volume XI. Genetics of reproduction, lactation, growth, adaptation, disease, and parasite resistance., , 254–257, 1986