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 4

Generation wise mean performances for rearing of HH10 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)	$V$ age larval span (hrs)	Survival rate (%)	Yield/10,000 larvae (kg)	Cocoon Wt. (g)	Shell Wt. (g)	Cocoon Shell%	Fecundity (No)	$V$ age larval span (hrs)	Survival rate (%)	Yield/10,000 larvae (kg)	Cocoon Wt. (g)	Shell Wt. (g)	Cocoon Shell (%)
F1	582	130	59.0 (50.7)	15.18	1.601	0.327	20.42 (26.86)	582	148	93.0 (74.6)	19.03	1.808	0.401	22.20 (28.11)
F2	502	134	63.3 (52.8)	14.74	1.521	0.312	20.53 (26.94)	502	144	92.8 (74.4)	18.77	1.784	0.395	22.13 (28.06)
F3	465	134	62.0 (52.1)	15.10	1.590	0.328	20.65 (27.03)	465	144	93.5 (75.2)	18.72	1.650	0.364	22.07 (28.02)
F4	435	134	77.7 (61.8)	16.39	1.542	0.318	20.68 (27.04)	435	144	91.6 (73.1)	16.75	1.851	0.401	21.68 (27.75)
F5	420	134	78.0 (62.0)	14.87	1.543	0.324	21.02 (27.29)	420	150	92.2 (73.7)	19.41	1.901	0.408	21.48 (27.62)
F6	485	—	—	—	—	—	—	485	144	92.5 (74.1)	18.37	1.825	0.391	21.39 (27.54)
F7	618	134	87.7 (70.3)	15.32	1.566	0.320	20.44 (26.88)	618	150	92.9 (74.5)	18.93	1.837	0.404	22.00 (27.97)
F8	440	—	—	—	—	—	—	440	144	92.0 (73.5)	18.87	1.806	0.398	22.02 (27.98)
F9	600	132	82.0 (64.9)	15.40	1.575	0.342	21.74 (27.79)	600	144	91.9 (73.4)	18.75	1.828	0.404	22.10 (28.04)
F10	453	—	—	—	—	—	—	453	144	92.0 (73.5)	18.73	1.791	0.397	22.16 (28.08)
F11	619	132	80.7 (63.9)	15.47	1.596	0.329	20.61 (27.00)	619	144	92.7 (74.3)	18.63	1.825	0.404	22.14 (28.07)
F12	458	—	—	—	—	—	—	458	144	93.3 (75.0)	18.07	1.781	0.397	22.29 (28.17)
Mean	506	133	73.80	15.487	1.567	0.324	20.762	506	145.00	92.5	18.59	1.807	0.397	21.97
$F$-test	ns	ns	*	**	ns	ns	ns	ns	ns	ns	***	*	ns	ns
Cd at 5%	—	—	19.3	1.07	—	—	—	—	—	—	0.76	0.10	—	—
CV%	15.06	1.14	14.57	5.57	3.21	3.97	4.08	15.06	1.69	1.24	4.00	4.18	4.03	2.432

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