Eficiência reprodutiva e comportamento parental de camundongos isogênicos e heterogênicos produzidos em ambiente modificado

• Autor(a) principal: Moreira, Virgínia Barreto [UNESP]
• Data de Publicação: 2015
• Tipo de documento: Tese
• Idioma: por
• Título da fonte: Repositório Institucional da UNESP
• Texto Completo: http://hdl.handle.net/11449/126631; http://www.athena.biblioteca.unesp.br/exlibris/bd/cathedra/15-07-2015/000841528.pdf
• topic: Camundongo como animal de laboratorio - Reprodução; Animais - Proteção; Animais - Criação; Mice as laboratory animals

The objective of this study was to evaluate the preference and effect of nesting materials provision on performance of inbred mice of the BALB/c strain and of heterogenic Swiss in intensive monogamous mating system. Firstly, a study was conducted to evaluate the preference of mice for the material offered for nesting. A system composed of four cages was used, with free access to water and food, connected by PVC tubing, which allowed animal displacement among all cages. Four types of materials were available for construction of the nest: cotton, gauze, cardboard rolls, and disposable polypropylene cap. Each of the four materials was offered simultaneously in one of four cages that formed the system. Ten identical system were used and each one housed a BALB/c couple, from 28 days of age up to the third reproductive cycle. The most commonly found materials in nest making were cap, roll, cotton and gauze (P <0.0083). Based on these results, two types of materials were selected to be offered to the animals in experiment 2. Although the roll was the second most used material, we chose cotton due to unfeasibility supplying of the item throughout the duration of the second experiment. The second experiment evaluated the reproductive efficiency in five reproductive cycles from birth to weaning. Sixty BALB / c full siblings pairs (inbred) and 60 pairs formed by random mating of Swiss strain (outbred), bred and maintained in a standardized environment were used. They were distributed in a completely randomized design in a 2x2 factorial arrangement (two strains in housing with or without nesting material). As a way of cage enrichment, polypropylene disposable cap cut into 8 pieces of approximately 1 cm each and one piece of cotton about 3 g were used after being previously packaged and autoclaved . The following characteristics were evaluated: age at first parturition, litter intervals, pre-weaning mortality and ...