Abstract:O experimento foi conduzido na Estação Experimental de Zootecnia de Gália, do Instituto de Zootecnia, SAA-SP, no ano de 2000. Oito raças de bicho-da-seda, de origem Japonesa e Chinesa foram estudadas (B101, B102, B104, B109, C201, C202, C203, C208) em relação a caracteres biológicos (Ganho de peso total de uma lagarta-GP, Porcentagem de mortalidade-MO, Número de machos-NM, Número de fêmeas-NF, Número de ovos/postura-OP e Porcentagem de eclosão-EC) e caracteres de produção de casulo (Peso unitário da glândula s… Show more
“…Strains C121-A, C209, M11-A, M18-2, and M102 showed the best performance when comparing the LBW and LBL obtained by 5 th instars (Table 2). However, only strains M11-A and M102 achieved higher values of SGW, contrary to what has been previously reported, as these parameters were indicated as correlates to predict the silkworm silk production capacity (Porto et al 2004).…”
Section: Resultscontrasting
confidence: 97%
“…However, Strains C121-A and C122-B generated lower values for SGW (Table 2), but exhibited the greatest values of RSP, indicating the silk gland development may be uneven among different strains, especially when 5 th instars were sampled earlier in their development. The CW (1.5 g), SW (0.4 g) and RSP (18.3%) mean values obtained for all 16 strains were higher than in some of the studies available in the literature (Porto & Okamoto 2003, Porto et al 2004, Rao et al 2006.…”
Section: Methodscontrasting
confidence: 60%
“…The mean value obtained for SGW corresponds to 16.5% of the larval body weight (LBW) (Fig 1), much lower than the 32-38% reported by Porto et al (2004), but in this case, seven to 8-day-old 5 th instars were analyzed instead. This time difference (two to three days) is important because the silk production is faster at the end of the 5 th instar, which can be refl ected in an increase in the SGW weight.…”
Section: Resultsmentioning
confidence: 65%
“…The SW and the SGW determine the potential for silk production because the energy for silk formation is contained within this gland (Porto et al 2004). However, Strains C121-A and C122-B generated lower values for SGW (Table 2), but exhibited the greatest values of RSP, indicating the silk gland development may be uneven among different strains, especially when 5 th instars were sampled earlier in their development.…”
“…Strains C121-A, C209, M11-A, M18-2, and M102 showed the best performance when comparing the LBW and LBL obtained by 5 th instars (Table 2). However, only strains M11-A and M102 achieved higher values of SGW, contrary to what has been previously reported, as these parameters were indicated as correlates to predict the silkworm silk production capacity (Porto et al 2004).…”
Section: Resultscontrasting
confidence: 97%
“…However, Strains C121-A and C122-B generated lower values for SGW (Table 2), but exhibited the greatest values of RSP, indicating the silk gland development may be uneven among different strains, especially when 5 th instars were sampled earlier in their development. The CW (1.5 g), SW (0.4 g) and RSP (18.3%) mean values obtained for all 16 strains were higher than in some of the studies available in the literature (Porto & Okamoto 2003, Porto et al 2004, Rao et al 2006.…”
Section: Methodscontrasting
confidence: 60%
“…The mean value obtained for SGW corresponds to 16.5% of the larval body weight (LBW) (Fig 1), much lower than the 32-38% reported by Porto et al (2004), but in this case, seven to 8-day-old 5 th instars were analyzed instead. This time difference (two to three days) is important because the silk production is faster at the end of the 5 th instar, which can be refl ected in an increase in the SGW weight.…”
Section: Resultsmentioning
confidence: 65%
“…The SW and the SGW determine the potential for silk production because the energy for silk formation is contained within this gland (Porto et al 2004). However, Strains C121-A and C122-B generated lower values for SGW (Table 2), but exhibited the greatest values of RSP, indicating the silk gland development may be uneven among different strains, especially when 5 th instars were sampled earlier in their development.…”
“…In addition to help to maintaining the germplasm bank, these analyses are crucial in choosing the parents involved in the production of superior hybrids in breeding programs. Moreover, the biological performance of B. mori can reflect on maximum final silk production potential (Porto et al, 2004).…”
The silkworm Bombyx mori L. is a domesticated insect considered as a reference in several domains (Mauchamp et al., 2008). The theoretical and practical importance of the silkworms are shown in many studies (Nagaraju et al., 1996;Kipriotis et al., 2000;Sudhakara et al., 2003;Vassileva et al., 2004;Petkov et al., 1998;Matei et al., 2002;. This study was conducted to compare four monovoltine breeds of Romanian silkworm, hatching in specific conditions, in different years (2001 and 2008), to see if there is a major difference between the biological characters of eggs belonging to those breeds in time. For both 2001 and 2008 years, four breeds AC29, AC, B1 and AB of Bombyx mori (eggs) were obtained from SC SERICAROM (Bucharest, Romania) and the same microclimate conditions were assuring. In total, per data set of each year were 16 variants because each of the breed was hatch in four variants, for more complete results of analyzed samples. The evaluation was made on the base of indices used for classified biological characters of silkworm eggs, comparative data shows that, between the same breeds hatching in different years, there is no significant difference. According to biological characteristics, the study allowed us to make a classification of the analyzed breeds. In the present research, we demonstrated that biological characters of silkworm eggs were well preserved and there are no significant variations between both set of data taken in study.
The pylorus is a segment of the hindgut of great morphological diversity, which is subdivided into the posterior interstitial ring, pyloric cone, and pyloric valve. There is no morphological information on Bombyx mori (L.) hybrids, which is an insect of economic interest to Brazil. Consequently, this study aimed to analyze the morphology of the pylorus of hybrid larvae of fifth instars of B. mori from crossbreeding of Chinese and Japanese races. These were anesthetized, and the pylorus was fixed and processed by light microscopy and scanning electron microscopy. The pylorus presented as a separate compartment, consisting of a simple epithelium, with large variation in cell morphology, covered on the luminal side by an intima with specializations in some areas, the spicules. The musculature was formed by bundles of striated muscle fibers in longitudinal and circular arrangement. These fibers were multinucleated with central and peripheral nuclei, operating in peristalsis. The morphology of the pylorus is a reflection of functional dynamism, and this study provided a better understanding of its physiology, which promotes the regulated movement of the bolus, preventing reflux and directing it towards the ileum in the formation of fecal pellets.
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