 Supplementary feeding not only increases kakapo breeding frequency , but also affects the sex ratio of kakapo offspring , as maternal conditions influence this ratio . ( See section " Reproduction " . ) This finding was subsequently used to increase the number of female chicks by deliberately manipulating maternal conditions . During the winter of 1981 , only females lighter than 1 @.@ 5 kg ( 3 @.@ 3 lb ) were given supplementary feeding to avoid raising their body condition , and the sex ratio results in 1982 were close to parity , eliminating the male @-@ biased sex ratios in the unrestricted feeding . 
 Supplementary feeding not only <a href='uninflect' title='1'><mark>increases</mark></a> kakapo breeding frequency , but also <a href='uninflect' title='2'><mark>affects</mark></a> the sex ratio of kakapo offspring , as maternal conditions influence this ratio . ( See section " Reproduction " . ) This finding was subsequently used to increase the number of female chicks by deliberately manipulating maternal conditions . During the winter of 1981 , only females lighter than 1 @.@ 5 kg ( 3 @.@ 3 lb ) <a href='uninflect' title='3'><mark>were</mark></a> given supplementary feeding to avoid raising their body condition , and the sex ratio <a href='uninflect' title='4'><mark>results</mark></a> in 1982 <a href='uninflect' title='5'><mark>were</mark></a> close to parity , eliminating the male @-@ biased sex ratios in the unrestricted feeding . 
Supplementary feedin not only increase kakapo breeding frequency , but also affect da sex ratio of kakapo offspring , as maternal conditions influence this ratio . ( See section " Reproduction " . ) This finding was subsequently used to increase the number of female chicks by deliberately manipulating maternal conditions . During the winter of 1981 , only females lighter than 1 @.@ 5 kg ( 3 @.@ 3 lb ) was given supplementary feeding to avoid raising their body condition , and tdasex ratio result in 1982 was close to parity , eliminating thdaale @-@ biased sex ratios in the unrestricted feeding .