Improving the efficiency of feed utilization in poultry by selection. 2. Genetic parameters of excretion traits and correlations with anatomy of the gastro-intestinal tract and digestive efficiency

Table 2 Estimated heritability (± standard errors, on diagonal) and genetic correlations (± standard errors, above diagonal) for excretion traits.

	CDUDM¹	FEW/BW	DEW/BW	FEW/FI	WE	NE/NI	PE/PI	NE/PE
CDUDM	0.30 ± 0.02	-0.94 ± ne	-0.93 ± ne	-0.64 ± ne2	0.39 ± ne	-1.00 ± ne	-0.68 ± 0.07	-0.87 ± ne
FEW/BW		0.09 ± 0.01	1.00 ± 0.01	0.76 ± 0.07	-0.22 ± 0.25	0.82 ± ne	0.43 ± 0.18	0.76 ± 0.23
DEW/BW			0.20 ± 0.03	0.51 ± 0.09	-0.37 ± 0.15	0.76 ± ne	0.36 ± 0.08	0.67 ± 0.13
FEW/FI				0.17 ± 0.04	0.54 ± ne	0.67 ± ne	0.87 ± 0.08	-0.05 ± 0.17
WE					0.13 ± 0.05	-0.34 ± ne	0.33 ± 0.17	-0.75 ± 0.12
NE/NI						0.29 ± 0.02	0.74 ± 0.06	0.58 ± ne
PE/PI							0.22 ± 0.04	-0.11 ± ne
NE/PE								0.18 ± 0.04

¹ CDUDM, coefficient of digestive use of dry matter; FEW/BW and DEW/BW, fresh and dry excreta weight relative to body weight at 23 d; FEW/FI, fresh excreta weight relative to feed intake, WE, water content of excreta, NE/PE, ratio of nitrogen to phosphorus excretion; NE/NI, PE/PI, nitrogen and phosphorus excreted relative to nitrogen and phosphorus intake
² ne: not estimated

ISSN: 2730-6844