Genetic parameters, reciprocal cross differences, and age-related heterosis of egg-laying performance in chickens

Table 5 Estimates of genetic and phenotypic correlations for egg production traits

Trait	AFE	OP	EN43	NC43	ACL43	APL43	EN72	NC72	ACL72	APL72	EN100	NC100	ACL100	APL100
AFE		− 0.26	− 0.70	− 0.57	0.29	DNC	0.01	− 0.43	0.28	DNC	0.27	− 0.31	0.21	DNC
OP	− 0.001		− 0.36	0.87	− 0.69	DNC	− 0.40	0.87	− 0.62	DNC	− 0.29	0.71	− 0.59	DNC
EN43	− 0.47	− 0.36		− 0.23	0.29	DNC	0.46	− 0.24	0.18	DNC	0.18	− 0.28	0.35	DNC
NC43	− 0.26	0.71	− 0.40		− 0.61	DNC	− 0.50	0.98	− 0.88	DNC	− 0.42	0.83	− 0.80	DNC
ACL43	0.05	− 0.38	0.42	− 0.82		DNC	0.73	− 0.82	0.98	DNC	0.69	− 0.67	0.99	DNC
APL43	DNC	DNC	DNC	DNC	DNC		DNC	DNC	DNC	DNC	DNC	DNC	DNC	DNC
EN72	− 0.17	− 0.30	0.70	− 0.45	0.47	DNC		− 0.54	0.63	DNC	0.90	− 0.33	0.68	DNC
NC72	− 0.13	0.57	− 0.28	0.78	− 0.50	DNC	− 0.25		− 0.63	DNC	− 0.44	0.91	− 0.83	DNC
ACL72	0.02	− 0.37	0.41	− 0.58	0.81	DNC	0.53	− 0.89		DNC	0.57	− 0.83	0.99	DNC
APL72	DNC	DNC	DNC	DNC	DNC	DNC	DNC	DNC	DNC		DNC	DNC	DNC	DNC
EN100	− 0.08	− 0.18	0.55	− 0.33	0.41	DNC	0.87	− 0.20	0.49	DNC		− 0.05	0.20	DNC
NC100	− 0.08	0.44	− 0.07	0.55	− 0.29	DNC	− 0.01	0.84	− 0.43	DNC	0.19		− 0.56	DNC
ACL100	0.01	− 0.39	0.37	− 0.54	0.64	DNC	0.52	− 0.67	0.87	DNC	0.11	− 0.79		DNC
APL100	DNC	DNC	DNC	DNC	DNC	DNC	DNC	DNC	DNC	DNC	DNC	DNC	DNC

Genetic correlations are above the diagonal and phenotypic correlations are below the diagonal. Standard errors ranged from 0.02 to 0.46 for genetic correlations, and from 0.01 to 0.05 for phenotypic correlations
AFE age at first egg, OP oviposition period, ENX cumulative egg number till X weeks of age, NCX number of clutches till X weeks of age, ACLX average clutch length till X weeks of age, APLX average pause length till X weeks of age, DNC did not converge

ISSN: 1297-9686