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| Mahmoudvand,Mohammad; Abbasipour,Habib; Sheikhi Garjan,Aziz; Reza Bandani,Ali. |
| The oligophagous pest Plutella xylostella (L.) is a major crucifer pest in Tehran Province, Iran. Hexaflumuron is an insect growth regulator insecticide with good effects on immature insect stages. The objective of this study was to investigate the effects of two sublethal concentrations (LC10 and LC25) of hexaflumuron on some biological parameters of P. xylostella larvae, such as birth rate (b), death rate (d), finite rate of increase (λ), generation time (T), sex ratio, pupation rate, and adult emergence. Results showed that hexaflumuron decreased the total number of eggs and oviposition and post-oviposition periods, pupation, and adult emergence in the treated generation, b, and λ. Hexaflumuron also increased T, d, and the... |
| Tipo: Journal article |
Palavras-chave: Hexaflumuron; Sublethal; Birth rate; Death rate; Oviposition period. |
| Ano: 2012 |
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0718-58392012000200007 |
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| CORRÊA, E. S.; EUCLIDES FILHO, K.; ALVES, R. G. de O.; VIEIRA, A.. |
| Foram analisados os dados de nove anos (1983-1991) referente a eficiência reprodutiva dos animais do sistema físico de produção do Centro Nacional de Pesquisa de Gado de Corte da Empresa Brasileira de Pesquisa Agropecuária (Embrapa Gado de Cote). Esse sistema, conduzido em regime exclusivo de pasto, apresentou taxa media de prenhez, calculada sobre todas as fêmeas expostas a touros (novilha de dois a três anos e vacas), de 75,9. Outros índices observados foram: reconcepção de vacas de primeira cria - 62,1%, mortalidade geral - 2,2%, mortalidade de bezerros ate a desmama - 6%. A mortalidade de bezerros representou 53,7% da mortalidade geral. Na analise dos dados de mortalidade de bezerros, o efeito de sexo foi significativo (P<0,01), com mortalidade de... |
| Tipo: Boletim de Pesquisa e Desenvolvimento (INFOTECA-E) |
Palavras-chave: Bovino de corte; Taxa de mortalidade; Mortality rate.; Cerrado; Eficiência Reprodutiva; Intervalo de Parto; Sistema de Produção; Taxa de Natalidade.; Birth rate; Beef cattle; Farming systems; Parturition interval; Reproductive performance.. |
| Ano: 2001 |
URL: http://www.infoteca.cnptia.embrapa.br/infoteca/handle/doc/325111 |
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| Moreira,Vanessa Stefani Sul; Del-Claro,Kleber. |
| The present study describes the life history of Aglaoctenus lagotis Holmberg, 1876 from oviposition to adulthood, analyzing the number of eggs in each egg sac, birth rate, number of instars, sex ratio, cephalothorax size of all instars, and developmental time in laboratory. The results indicate that the studied species can produce two egg sacs during the reproductive period, and that the post-embryonic phase includes 12 nymphal instars. A higher mortality rate was observed during the first three instars, featuring a Type III survival curve. The sex ratio was geared towards the female in the adults and no significant difference was observed in the length of the cephalothorax between male and female. This species can therefore be considered monomorphic.... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Birth rate; Number of instars; Sexual dimorphism. |
| Ano: 2011 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1984-46702011000500003 |
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