As data indicate, P. sansibaricus showed ~ 12%more weight gain than P. excavatus (t = 10.36, P<0.001). Comparatively, P. excavatus showed moreindividual growth rate (mg/worm/day) 3.40 ± 0.15 inhousehold waste, but it was not found statisticallydifferent from those by P. sansibaricus (2.28 ± 0.11)(t = 2.75, P > 0.05) (Table 2). The cocoon productionbetween P. excavatus and P. sansibaricus also variedstatistically (t-test: P < 0.05). P. excavatus showedmore cocoon numbers (358.67 ± 8.02), about 111%more than those by P. sansibaricus (Table 2). Thereproduction rate (cocoon/worm/day) was also foundat its maximum in P. excavatus (0.13 ± 0.005) and itwas significantly more than that by P. sansibaricus(0.06 ± 0.007) (t-test: P > 0.05). The cocoon rate(cocoon/worm) was much better in P. excavatus thanP. sansibaricus (Table 2). However, the peak of cocoonrate followed by a drastic decline in both species after90 days of experimentation (Fig. 2). During compostingP. sansibaricus showed the maximum mortality rate.However, the observed difference in both species ofworm for mortality was not found significant (t-test:P <0.05).
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