
TY  - JOUR
A1  - Sheldon, BL 
T1  - Genetic parameters associated with characters effecting egg production in the domestic fowl. I. Heritability of total egg production during the pullet year
JF  - Australian Journal of Agricultural Research
JO  - Aust. J.  Agric. Res.
Y1  - 1956
VL  - 7
IS  - 6
SP  - 625
EP  - 629
KW  - 
UR  - https://doi.org/10.1071/AR9560625 
N2  - Egg production records of White Leghorn pullets hatched a t the Poultry Research Centre, Werribee, Vic., during 1947 to 1950 inclusive have been analysed both on a hen-housed (Production Index) and a survivor basis. Estimates of heritability were obtained by two methods: (1) by the analysis of components of variance between families of full sibs and half-sibs; (2) by estimating the intra-sire regression of the mean performance of offspring on dam's performance. Heritability, in the narrow sense, of Production Index during the pullet year is shown to be 23-30 per cent. with a reasonably low standard error, while heritability of survivors' production is slightly lower but not significantly so. Possible reasons are advanced for the low estimates of heritability of survivors' production. 
ER  -

