Improving the efficiency of feed utilization in poultry by selection. 1. Genetic parameters of anatomy of the gastro-intestinal tract and digestive efficiency

Table 3 Estimates (± standard errors) of heritability (on diagonal) and genetic correlations (above diagonal) for GIT traits

Trait¹	CW	PRW	GZW	LW	DW	JW	IW	DL	JL	IL	DD	JD	ID
CW	0.21 ± 0.06	0.53 ± 0.14	0.09 ± 0.06	0.75 ± 0.13	0.18 ± 0.08	-0.14 ± 0.13	0.04 ± 0.10	0.23 ± 0.19	-0.13 ± ne²	-0.10 ± 0.23	-0.05 ± 0.20	0.11 ± 0.19	0.22 ± 0.18
PRW		0.09 ± 0.06	0.81 ± 0.15	-0.55 ± ne	0.54 ± 0.20	-0.28 ± 0.40	0.17 ± 0.19	0.51 ± 0.43	0.52 ± 0.40	0.65 ± 0.29	-0.18 ± 0.26	-0.56 ± 0.20	-0.32 ± 0.27
GZW			0.53 ± 0.11	-0.51 ± 0.30	0.13 ± 0.16	-0.25 ± 0.16	-0.03 ± 0.14	0.16 ± ne	0.28 ± 0.15	0.22 ± 0.17	-0.37 ± 0.12	-0.56 ± 0.13	-0.33 ± 0.11
LW				0.05 ± 0.02	0.38 ± 0.35	0.66 ± 0.20	0.65 ± 0.25	0.70 ± 0.09	0.75 ± 0.08	0.24 ± 0.27	-0.47 ± 0.21	-0.37 ± 0.20	-0.03 ± 0.21
DW					0.33 ± 0.06	0.62 ± 0.08	0.70 ± 0.06	0.67 ± ne	0.39 ± 0.14	0.52 ± 0.11	0.38 ± ne	0.17 ± 0.13	0.20 ± 0.13
JW						0.44 ± 0.06	0.88 ± 0.03	0.40 ± 0.12	0.21 ± 0.15	0.15 ± ne	0.21 ± 0.13	0.60 ± 0.09	0.60 ± ne
IW							0.37 ± 0.05	0.33 ± ne	0.16 ± 0.13	0.21 ± ne	0.41 ± 0.14	0.54 ± 0.11	0.67 ± 0.08
DL								0.46 ± 0.06	0.89 ± ne	0.93 ± ne	-0.48 ± ne	-0.34 ± 0.13	-0.40 ± 0.12
JL									0.32 ± 0.06	0.90 ± 0.04	-0.71 ± 0.09	-0.64 ± 0.09	-0.61 ± 0.09
IL										0.28 ± 0.06	-0.52 ± 0.12	-0.56 ± ne	-0.57 ± 0.10
DD											0.39 ± 0.06	0.78 ± 0.05	0.79 ± 0.06
JD												0.50 ± 0.07	0.93 ± 0.02
ID													0.44 ± 0.06

¹CW, PRW, GZW, LW, DW, JW, IW, weights of crop, proventriculus, gizzard, liver, duodenum, jejunum, and ileum in relation to BW; DL, JL, IL, lengths of duodenum, jejunum and ileum in relation to BW; DD, JD, ID, density of duodenum, jejunum and ileum. ² ne: not estimated.

ISSN: 2730-6844