Search for QTL affecting the shape of the egg laying curve of the Japanese quail

BMC Genomic Data

Table 1 Egg laying equations of F2 and F0 (lines DD and LTI) Japanese quail populations using three theoretical models

Model 1 [4]	elr(t) = a × exp(-bt)/(1+exp(-c(t-d))
Parameter	a	b	c	d	R²
F2	99.62 ± 0.77	0.00721 ± 0.00024	1.242 ± 0.129	2.901 ± 0.041	0.921
DD	97.55 ± 3.28	0.00899 ± 0.00138	1.022 ± 0.207	3.391 ± 0.177	0.880
LTI	93.24 ± 2.43	0.00734 ± 0.00106	1.253 ± 0.270	3.512 ± 0.154	0.927
Model 2 [6]	y(t) = (y_P/t₂) × t – r × (y_P/t₂) × Ln [(exp(t/r) + exp(t₂/r))/(1 + exp(t₂/r))] + r × b₄× Ln [(exp(t/r) + exp((t₂+P)/r))/(1 + exp((t₂+P)/r))]
Parameter	y _P	t ₂	b ₄	P	R²
F2	18.98 ± 0.13	5.186 ± 0.124	-0.1385 ± 0.0055	11.58 ± 1.358	0.922
DD	18.18 ± 0.41	6.169 ± 0.370	-0.2014 ± 0.0401	11.53 ± 3.580	0.880
LTI	17.73 ± 0.28	6.307 ± 0.269	-0.1729 ± 0.0347	12.49 ± 3.132	0.926
Model 3 [7]	y(t) = [21k₁× (1-exp(-t))/(1+exp(-t))] - [21(k₁-k₂)× (1 - exp(-t))/(1+exp(-(t-c₂)))]
Parameter	k ₁	k ₂	c ₂	-	R²
F2	0.8361 ± 0.0035	0.6712 ± 0.0057	42.01 ± 0.31	-	0.915
DD	0.8045 ± 0.0126	0.6925 ± 0.0215	29.25 ± 1.54	-	0.865
LTI	0.7802 ± 0.0095	0.6771 ± 0.0237	33.55 ± 1.35	-	0.906

¹: elr(t) = egg laying rate and y(t) = number of eggs laid over the three previous weeks, after t weeks of egg laying test.
²: equations obtained with egg laying data from 359, 65 and 66 quail, in the F2 population and lines DD and LTI, respectively.
a = scale parameter; b = weekly rate of decrease in egg laying after peak; c = indicator of 1/variance in sexual maturity; d = number of weeks in test until sexual maturity.
y_P= 3-week production at the egg laying plateau; t₂= number of weeks in test until egg laying plateau; b₄= weekly rate of change in egg laying after the plateau; P = persistency of constant production.
k₁ = proportion of peak production during the increasing phase of the curve; k₂= proportion of peak production during the decreasing phase of the curve; c₂ = duration of peak egg production.

ISSN: 2730-6844