Journal of Food, Agriculture and Environment

Effect of individual selection system of parental silkworm pure lines on reproductive and resistant traits of six hybrids during three next generations

Author(s):

Hossein Hojatpour ¹, Abolghasem Lavvaf ¹, Alireza Seidavi ²*, Tarlan Farahvash ³, Ehsan Hajian ¹

Recieved Date: 2011-12-14, Accepted Date: 2012-04-27

Abstract:

The effect of individual selection system of parental pure lines on performance of six hybrids resulted from simple crossing (31×32, 32×31,103×104, 104×103,107×110 and 110×107) in fourth generation was studied. Six parental pure lines of Iranian silkworm (31, 32, 103, 104, 107 and 110) were recorded separately from the selective group (forty males and forty females with higher cocoon weight than average colony). A control group including population with same average colony as base colony was studied. Each  line in zero generation in two selective and random groups were replaced, and without any re-selection, lines during continuous generations (three generations) as pure lines were maintained and trained and intra breeding was carried out. By crossing between parental lines in four generation, six types of commercial larvae were produced. Then each one in the form of four repetitions was trained and their performances (selective and random hybrid) were recorded and finally compared. Results of individual selection system of parental pure lines were compared with the performance of these offspring hybrids giving rise to average hybrids resulted from crossing parental pure lines. Recorded traits in this study included four resistance traits and seven reproductive traits which include (respectively) the alive larvae number, alive pupae number, pupae vitality percentage in best cocoon, pupae vitality percentage in middle cocoon, larvae duration, hatched larvae number, unhatched eggs number, unfertilized eggs number, unhatched eggs percentage, unfertilized eggs percentage, and total produced eggs number which in fourth generation were recorded. The obtained results of comparing the average of each trait (performance) among hybrids result of simple crossing of six of these 11 studied parental pure lines were studied. The selection in the base community based on cocoon weight increased alive larvae number  in hybrid 32×31 and  alive pupae number in hybrids 103×104 (3 pupae) and 32×31 (0.75 pupae). Pupae vitality percentage was increased in the best cocoons in hybrids 103×104 (4.15%), 104×103 (1.58%) and 31×32 (0.14%) and  in the middle cocoons in hybrids 103×104 (5.39%), 104×103 (3.55%), 110×107 (1.50%) and 107×110 (0.83%).  Unfertilized egg number and hatched egg percentage in hybrid 31×32 were significantly different. Hatched larvae number and total produced eggs in hybrid 103×104 were significantly different. Produced hybrids, except 32×31, 107×110 and 110×107, showed significant difference for some traits (total of 6 traits). The  results showed that the selection of individual parental pure lines of silkworm on performance of offspring hybrid had significant effect. 

Keywords:

Silkworm, generation, individual selection, parental pure line, crossing, resistance, reproductive

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Journal: Journal of Food, Agriculture and Environment
Year: 2012
Volume: 10
Issue: 2
Category: Environment
Pages: 1237-1244

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