Table-3.

Multiple linear regressions on production and reproduction traits of environmental variables in broiler breeder poultry.

Coefficients	5th week body weight (males)	5th week body weight (females)	20th week body weight (males)	20th week body weight (females)	Egg number up to 40 week age	Egg shape index	Age at sexual maturity (females)
a	545.06	−122.45	−69.63	173.99	−24.30	−356.05	−471
b1	17.19	6.31	4.36*	−0.36*	−0.01*	−0.11	−0.05
b2	0.15*	0.11	−0.22	0.10	0.06*	−0.01*	−0.17
b3	3.84	0.59*	−0.75	−0.29*	−0.67*	0.02*	2.07*
b4	−0.69*	−0.94	0.05	0.17	-0.02	0.02	−0.26
b5	−0.22	0.15*	−0.15*	−0.15*	−0.01*	−0.003	0.004
b6	−1.14	−0.51	0.15*	−0.07*	0.04*	0.025*	0.10*
b7	2.33*	0.29	−0.31*	0.19*	−0.17*	0.132	−0.32
b8	3.63	2.40	0.95	1.28*	0.11*	−0.141	−0.18
b9	−88.66	−65.21	−22.69*	1.09*	−0.33*	1.69	0.80
R2	0.50	0.12	0.29	0.003	0.08	0.30	0.90
SE (regression)	129.04	102.89	386.42	303.06	14.46	4.04	7.58
F (regression)	19.69**	5.34**	8.45**	0.154	4.32**	12.55**	44.43**

^*Significant at P<0.05;

^**Significant at P<0.01,

Subscripts of coefficients: 1. Total rainfall (mm); 2. Maximum temperature (°C); 3. Evaporation (mm); 4. Minimum temperature (°C); 5. Morning RH (%); 6. Afternoon RH (%); 7. Bright sunshine hours; 8. Wind velocity (km/h); 9. Rainy days. F (regression) = F-value calculated through ANOVA for the regression, SE=Standard error