Comparative analysis of quantitative trait loci for body weight, growth rate and growth curve parameters from 3 to 72 weeks of age in female chickens of a broiler–layer cross

Table 4 Comparative positions of quantitative trait loci (QTL) for body weight, growth rates and growth curve parameters

No¹	Age specific weight and *growth rate*											ln Gompertz parameter
	3wk		6wk		12wk		24wk		48wk		72wk	W_A	T_i	K	L	W_o
			Gr3-6		Gr6-12		Gr12-24		Gr24-48		Gr48-72
1	131	505	130	508	137	525	131	560							541
			*130*			578					365
2		298	148	286		281		276		286		283	32
				282							365
3			47	235	39				40	216	45	46, 205
			49	237	13				2	*221*
4		148	0	161	0	177		142		153	183	166	22	17	144
			0	*163*		*168*				183	12
6	30		8		30				9
			11
7												46		93
											92
8	63		67		61		14	87	24		12	13				78
							15
9					90				81			46
					97
11	0			0									7
				0
Z	127			119		117		127
M²	13		13		13		13	27	15	27	27, 28	15, 27		28		13
			13		27					28

¹Macrochromosome number.
²Microchromosome number only is presented in the rows of the table (see Additional file 3: Table S3)
W_A = asymptotic (estimated mature) body weight, i.eW_o*exp (L/K), g.
T_i = age at point of inflection, where Ti = (1/K)log(L/K), d.
K = rate of exponential decay, g/d.
L = growth rate per day at day zero, g/d.
W₀ = hatching weight, (y –intercept), g.
The position (cM) of QTL for weight at a specific age (normal font), growth between successive ages (italic font) and Gompertz curve parameter estimates (normal font) are itemised. Genome significant (P < 0.05) QTL are in bold font; suggestive (chromosome significant) QTL are in regular font.

ISSN: 2730-6844