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  • About
  • The Global ETD Search service is a free service for researchers to find electronic theses and dissertations. This service is provided by the Networked Digital Library of Theses and Dissertations.
    Our metadata is collected from universities around the world. If you manage a university/consortium/country archive and want to be added, details can be found on the NDLTD website.
1

Caracteriza??o comportamental end?crina das fases ontogen?ticas de sag?i comum (Callithrix jacchus) / Caracteriza??o comportamental end?crina das fases ontogen?ticas de sag?i comum (Callithrix jacchus)

Castro, Dijenaide Chaves de 11 November 2011 (has links)
Made available in DSpace on 2014-12-17T15:36:38Z (GMT). No. of bitstreams: 1 DijenaideCC_TESE.pdf: 3067760 bytes, checksum: 8bdbafb50f4741aa87b6e7ea5023d6a3 (MD5) Previous issue date: 2011-11-11 / The use of animal models in biomedical research is ever increasing. Models that use primates might also have advantages in terms of low maintenance costs and availability of biological knowledge, thereby favoring their use in different experimental protocols. Many current stress studies use animal models at different developmental stages since biological response differs during ontogeny. The aims of this study were to perform a detailed characterization of the developmental stages of common marmosets (Callithrix jacchus), a very important animal model used in biomedical research. Ten subjects, 6 females and 4 males, were followed from birth to initial adult age (16 months). Behavioral and fecal collection for measurement of adrenal (cortisol) and sex (progesterone, estradiol and androgens) hormones took place twice a week during the first month of life and once a week for the remainder of the study. Behavior was observed for 30 minutes in the morning (0700-09:00h) and afternoon (12:00-14:00h). Behavioral profile showed changes during ontogeny, characterizing the 4 developmental stages and the respective phases proposed by Le?o et al (2009).. Differentiation of developmental stages was considered using the onset, end, change and stabilization of the behavioral profile parental care (weaning and carrying), ingestion (solid food), affiliation (social grooming) and autogrooming, agonism (scent marking and piloerection) and play behavior and endocrine profile. Infant weaning and carrying terminated within the infantile stage and the peak of solid food ingestion was recorded in the infantile III phase. Receiving grooming was recorded earlier than grooming performed by the infant and autogrooming. The first episode of scent marking was recorded in the 4th week and it was the least variable behavior, in terms of its onset, which, in almost all animals, was between the 5th and 7th week of life. Solitary play and play with the twin started around the 7th week and play with other members of the group started 8 weeks later. Sex hormone secretion started to differ from basal levels between the 21st and 23rd week of life, in males and females, suggesting that puberty occurs simultaneously in both sexes. Basal cortisol, even at an early age, was higher in females than in males. However, cortisol was not correlated with the juvenile stage, as expected, since this stage corresponds to the transition between infancy and adult age and most behaviors are intensified by this time. The behavioral and endocrine profile of subadult animals did not differ from that of the adults. These results provide more detailed parameters for the developmental process of C. jacchus and open new perspectives for the use of experimental approaches focused on the intermediate ontogenetic phases of this species / O uso de modelos animais em pesquisa biom?dica ? cada vez mais crescente e os modelos utilizando primatas devem apresentar vantagens em termos de custos de manuten??o e caracter?sticas relacionadas ao maior conhecimento da sua biologia para uso em diferentes protocolos experimentais. Diferentes modelos atuais de pesquisa em estresse utilizam animais em diferentes est?gios do desenvolvimento e in?meros estudos demonstram a diferen?a na resposta biol?gica diante de agentes estressores ao longo da ontog?nese. Com o objetivo de caracterizar de maneira mais detalhada as fases do desenvolvimento do sagui comum, Callithrix jacchus, importante modelo utilizado em pesquisa biom?dica, utilizou-se 10 animais, 6 f?meas e 4 machos, que foram acompanhados desde o nascimento at? o in?cio da idade adulta (16 meses). A coleta de dados comportamentais e de fezes para a mensura??o dos horm?nios esteroides de origem adrenal (cortisol) e gonadais (progesterona, estradiol e andr?genos) foram realizadas duas vezes por semana no primeiro m?s de vida dos filhotes e semanalmente no restante do estudo. As observa??es comportamentais tiveram dura??o de 30 minutos e foram realizadas nos turnos matutino (07:00-09:00h) e vespertino (12:00-14:00h).O perfil comportamental de C. jacchus apresentou modifica??es ao longo da ontog?nese caracterizando cada um dos 4 est?gios ontogen?ticos e suas respectivas fases propostas na classifica??o de Le?o (2009). A diferencia??o das etapas do desenvolvimento foi feita a partir do surgimento, t?rmino, varia??o e estabiliza??o no perfil comportamental - cuidado parental (amamenta??o, transporte) ingest?o de alimentos (alimenta??o s?lida), afilia??o (cata??o social recebida e feita e autocata??o) agonismo (marca??o de cheiro e piloere??o) e brincadeira - e no perfil end?crino. O comportamento de amamenta??o e transporte terminou na fase infantil II e a ingest?o alimentar apresentou seu pico na fase infantil III. A cata??o social recebida antecedeu a cata??o feita e a autocata??o, e o comportamento de marca??o de cheiro foi o que apresentou menor variabilidade em rela??o ao seu in?cio, que se concentrou, em quase todos os animais, entre a 5? e 7? semanas de vida. A brincadeira solit?ria e com o g?meo principiaram ao redor da 7? semana e a brincadeira com outros membros do grupo se iniciou 8 semanas depois. A secre??o dos horm?nios sexuais passou a se diferenciar dos valores basais entre a 21? e 23? semanas em machos e f?meas, sugerindo que a puberdade acontece simultaneamente para os dois sexos. O cortisol basal de f?meas mesmo em idade imatura foi mais elevado do que nos machos. Contudo, as varia??es do cortisol n?o se correlacionaram com o est?gio juvenil como esperado uma vez que esse est?gio corresponde ? transi??o entre a idade infantil e a idade adulta, e que se expressou com a intensifica??o da maioria dos comportamentos. Os padr?es comportamentais e end?crinos dos adultos n?o diferiram entre as idades subadulta e adulta. Estes resultados disponibilizam par?metros de desenvolvimento mais detalhados para C. jacchus e abrem perspectivas para a utiliza??o de abordagens experimentais focadas em determinadas etapas da ontog?nese dessa esp?cie

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