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. 2023 Aug 24;37(1):16–27. doi: 10.5713/ab.23.0165

Table 2.

Variance components, genetic parameters, model statistic criteria, and rate of decline of body weight and average daily gain in Thai native chickens (Pradu Hang dum) at various temperature and humidity indices

Items1) Body weight Average daily gain
THI72 THI74 THI76 THI78 THI80 THI72 THI74 THI76 THI78 THI80
Parameters
 Va0 11,110.00 9,137.70 6,831.50 3,771.70 3,467.00 1.53 1.25 1.02 0.69 0.52
 Va1 146.43 195.71 283.15 304.82 800.99 0.03 0.04 0.06 0.09 0.11
 Cova0,a1 −1,159.20 −1,193.10 −1,188.40 −743.10 −1,050.10 −0.18 −0.18 −0.20 −0.18 −0.13
 Vp0 6,479.90 4,926.30 4,773.60 2,823.80 822.43 0.50 0.44 0.34 0.13 0.06
 Vp1 131.73 174.20 312.90 329.81 213.59 0.01 0.02 0.04 0.06 0.06
 Covp0,p1 −811.96 −780.96 −1,015.70 −584.05 382.05 −0.08 −0.10 −0.11 −0.08 −0.04
 Ve 6,680.00 6,493.00 6,229.70 6,772.10 6,972.10 4.59 4.52 4.44 4.48 4.55
 h2 (±SE) 0.45±0.02 0.43±0.02 0.37±0.02 0.26±0.02 0.26±0.03 0.23±0.02 0.20±0.02 0.17±0.02 0.13±0.02 0.10±0.03
 pe2 (±SE) 0.26±0.01 0.23±0.01 0.25±0.01 0.34±0.02 0.33±0.03 0.08±0.01 0.07±0.01 0.06±0.01 0.02±0.02 0.02±0.03
 rg −0.90 −0.89 −0.85 −0.58 −0.55 −0.87 −0.85 −0.81 −0.71 −0.57
 rp −0.87 −0.84 −0.83 −0.83 −0.86 −0.96 −0.95 −0.95 −0.88 −0.67
Rate of decline (gram/THI)
 Male 0 0 −9.30 −28.00 −36.77 0 0 −0.23 −0.47 −0.94
 Female 0 0 −6.04 −18.12 −30.20 0 0 −0.21 −0.42 −0.83
Statistic criteria
 −2logL 919 473 0 616 968 528 275 0 251 515
 AIC 919 473 0 616 968 528 275 0 251 515
 BIC 919 473 0 616 968 528 275 0 251 515

THI, temperature and humidity indices; Va0, additive variance of animal; Va1, additive variance of heat stress effect; Cova0a1, covariance between additive variance of animal and heat stress effect; Vp0, permanent environmental variance of animal; Vp1, permanent environmental variance of heat stress effect; Covp0p1, covariance between permanent environmental variance of animal and heat stress effect; Ve, residual variance; h2, heritability; SE, standard error; rg, genetic correlation between animal and heat stress effect; rp, correlations between the intercept and slope of the permanent environmental effects; −2logL, minus twice the logarithm of the likelihood; AIC, Akaike’s information criterion; BIC, Bayesian information criterion.