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 2

Generation wise mean performance for rearing of HH8 at two temperature conditions.

		$40\pm 1^{°}$C and $85\pm 5$% RH						$25+1^{°}$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) (No)	Cocoon Wt. (g)	Shell Wt. (g)	Cocoon Shell (%)
F1	680	130	53.00 (46.74)	15.67	1.566	0.324	20.67 (27.04)	680	148	94.1 (75.9)	17.92	1.784	0.396	22.19 (28.11)
F2	446	134	54.7 (47.7)	14.65	1.562	0.316	20.26 (26.75)	446	144	92.6 (74.2)	17.23	1.726	0.393	22.78 (28.51)
F3	430	134	55.3 (48.8)	15.59	1.580	0.329	20.85 (27.16)	430	144	92.8 (74.4)	17.81	1.695	0.379	22.37 (28.25)
F4	420	134	65.7 (54.1)	14.82	1.588	0.328	20.67 (27.04)	420	144	92.0 (73.5)	17.61	1.781	0.406	22.81 (28.53)
F5	425	134	76.3 (60.8)	15.22	1.593	0.324	20.34 (26.31)	425	150	91.6 (73.1)	18.55	1.933	0.440	22.77 (28.50)
F6	428	—	—	—	—	—	—	428	144	90.9 (72.4)	18.58	1.789	0.402	22.45 (28.28)
F7	608	134	77.0 (61.3)	14.37	1.607	0.332	20.70 (27.05)	608	150	91.3 (72.8)	18.23	1.785	0.405	22.71 (28.46)
F8	434	—	—	—	—	—	—	434	144	91.8 (73.3)	18.05	1.803	0.405	22.45 (28.28)
F9	616	132	80.3 (63.6)	15.79	1.598	0.342	21.42 (27.57)	616	144	91.6 (73.1)	18.42	1.824	0.407	22.33 (28.20)
F10	438	—	—	—	—	—	—	438	144	91.6 (73.1)	18.48	1.767	0.397	22.46 (28.29)
F11	611	132	79.0 (62.7)	15.73	1.569	0.329	20.98 (27.26)	611	144	91.9 (73.4)	18.26	1.800	0.402	22.35 (28.22)
F12	448	—	—	—	—	—	—	448	144	91.4 (72.9)	18.12	1.720	0.388	22.56 (28.36)
Mean	499	133	67.66	15.239	1.584	0.328	20.737	499	145.00	92.0	18.10	1.784	0.402	22.52
$F$-test	*	ns	***	**	ns	ns	ns	*	ns	ns	*	**	**	ns
CD at 5%	3,10	—	15.02	0.79	—	—	—	3,10	—	—	0.74	0.09	0.02	—
CV%	19.66	1.14	17.57	4.32	2.28	3.56	3.91	19.66	1.69	1.475	2.97	4.14	4.35	1.26

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