On the Breeding of Bivoltine Breeds of the Silkworm, Bombyx mori L. (Lepidoptera: Bombycidae), Tolerant to High Temperature and High Humidity Conditions of the Tropics

Table 6

Generation wise mean performances for rearing of HH112 at two temperature conditions.

	$40\pm 1^{°}$C and $85\pm 5$% RH							$25\pm 1^{°}$C and $65\pm 5$% RH
Generation	Fecundity (No)	$V$th age larval span (hrs)	Survival rate (%)	Yield/10,000 larvae (kg)	Cocoon Wt. (g)	Shell Wt. (g)	Cocoon Shell%	Fecundity (No)	$V$th age larval span (hrs)	Survival rate (%)	Yield/10,000 larvae (kg)	Cocoon Wt. (g)	Shell Wt. (g)	Cocoon Shell%
F1	600	130	53.8 (46.74)	16.04	1.600	0.325	20.33 (26.80)	600	148	91.6 (73.1)	18.76	1.756	0.382	21.77 (27.81)
F2	484	134	60.7 (51.2)	15.25	1.562	0.330	21.16 (27.29)	484	144	92.6 (74.2)	18.73	1.834	0.406	22.16 (28.08)
F3	470	134	53.0 (46.74)	14.77	1.521	0.334	21.96 (27.94)	470	144	94.4 (76.3)	18.88	1.821	0.407	22.32 (28.19)
F4	464	134	65.7 (54.1)	14.77	1.585	0.325	20.51 (26.92)	464	144	93.8 (75.5)	18.77	1.915	0.430	22.46 (28.29)
F5	450	134	56.3 (48.5)	15.93	1.571	0.329	20.96 (27.24)	450	150	92.7 (74.3)	19.81	1.947	0.438	22.50 (28.32)
F6	455	—	—	—	—	—	—	455	144	92.3 (73.8)	18.78	1.839	0.414	22.51 (28.32)
F7	625	134	77.7 (61.8)	13.74	1.579	0.336	21.30 (27.48)	625	150	91.1 (72.6)	18.94	1.823	0.415	22.75 (28.49)
F8	462	—	—	—	—	—	—	462	144	91.8 (73.3)	18.47	1.847	0.421	22.78 (28.51)
F9	632	132	83.7 (66.1)	16.42	1.598	0.327	20.46 (26.89)	632	144	92.5 (74.1)	19.27	1.863	0.424	22.74 (28.48)
F10	468	—	—	—	—	—	—	468	144	92.5 (74.1)	18.92	1.775	0.396	22.34 (28.21)
F11	610	132	83.3 (65.8)	15.94	1.569	0.327	20.83 (27.15)	610	144	93.6 (75.3)	18.71	1.808	0.411	22.72 (28.47)
F12	470	—	—	—	—	—	—	470	144	92.6 (74.2)	18.71	1.759	0.396	22.50 (28.31)
Mean	516	133	66.78	15.357	1.574	0.33	20.938	516	145.00	92.6	18.90	1.832	0.412	22.46
$F$-test	ns	ns	*	***	ns	ns	ns	ns	ns	ns	ns	*	**	ns
CD at 5%	—	—	18.7	0.92	—	—	—	—	—	—	—	0.10	0.02	—
CV%	14.61	1.14	19.48	6.26	2.29	3.22	4.16	14.61	1.69	1.90	2.57	4.10	4.28	2.02

${}^{*},\mathrm{\hspace{0.17em}\hspace{0.17em}}{}^{**},\mathrm{\hspace{0.17em}\hspace{0.17em}}{}^{***}\text{Denote}$ significant difference at 5%, 1% and 0.1% level, respectively. ns: Denote non significant. Values in parenthesis are angular transformed.