Navegando por Assunto "Modelo animal"

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Acesso aberto (Open Access)
Dissociação entre observação e interação na modificação do display agressivo do Betta splendens
(Universidade Federal do Pará, 2011) CUNHA NETO, João Soares da; GOUVEIA JUNIOR, Amauri; http://lattes.cnpq.br/1417327467050274
The observation of fight (i.e., the presence of an anonymous observer of a fight) is something that changes the parameters of the fighting display of Betta splendens. The aim of this study was to identify whether and how observation alone or associated with the interaction modifies the emission of the display. Male Betta splendens were used (N = 28) in a battery of experiments to identify whether the aggressive display is modified either by the observation of a conspecific in a situation of confrontation (Experiment I) or by the observation of a conspecific in a situation of confrontation and subsequent exposure to this very conspecific (Experiment II). There was no statistical difference in the data obtained from the Experiment I, however, with respect to the data obtained in the Experiment II we could identify a statistically significant difference (F (1.6) = 6.002, p = 0.05) reflected in an increased latency of the Horizontal Display. We concluded that in Experiment I the behaviors were stable, and that the observation associated with interaction (Experiment II) is able to modify the emission of the aggressive display of Betta splendens.
Acesso aberto (Open Access)
Interação genótipo-ambiente em rebanhos nelore da Amazônia Legal
(Universidade Federal do Pará, 2013-09) MATOS, Amanda de Sousa; SENA, Josynélia do Socorro da Silva; MARCONDES, Cíntia Righetti; LÔBO, Raysildo Barbosa; RORATO, Paulo Roberto Nogara; CUCCO, Diego de Córdova; ARAÚJO, Ronyere Olegário de; BEZERRA, Luiz Antonio Framartino
Genotype-environment interaction was studied by two different procedures in productive and reproductive traits of Nellore cattle. Data from adjusted weights at 120 (P120), 210 (P210), 450 (P450) days of age, scrotal circumference at 450 days of age (PE450) and age at first calving (IPP) for 211,744 records from Nellore herds located in the Legal Amazon region were used in the analysis. The effect of genotypeenvironment interaction was studied through heritability estimates and rank correlation, comparing the Legal Amazon animals with the general basis of animals – PMGRN Nellore Brazil. Bi-trait analyses considered P120 as anchor-trait with P210, P450 and PE450 as another one. IPP has been analyzed separately in single-trait analysis and considering GCIPP as fixed and additive and residual effects as random. Estimates of heritability for P120, P210, P450, PE450 and IPP on the data of the Legal Amazon were: 0.20 to 0.49; 0.21; 0.48; 0.45; and 0.21, respectively, and in general data of PMGRN – Nellore Brazil were: 0.23; 0.25; 0.34; 0.43 and 0.11, respectively. Correlations between rank for P120, P210, P450, PE450 and IPP were equal to 0.77; 0.79; 0.82; 0.78 and 0.38, respectively. The analysis of the genotypeenvironment interaction, through the heritability estimates, showed larger effects on maternal, weight at 450 days of age and age at first calving, whereas the rank correlations showed strong evidence in almost all traits studied.