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Tags: ontogeny + Mammals

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  1. Individual hunting behaviour and prey specialisation in the house cat Felis catus: implications for conservation and management

    Contributor(s):: Dickman, C. R., Newsome, T. M.

    Predators are often classed as prey specialists if they eat a narrow range of prey types, or as generalists if they hunt multiple prey types. Yet, individual predators often exhibit sex, size, age or personality-related differences in their diets that may alter the impacts of predation on...

  2. "Do not choose as I do!" - Dogs avoid the food that is indicated by another dog's gaze in a two-object choice task

    Contributor(s):: Balint, A., Farago, T., Meike, Z., Lenkei, R., Miklosi, A., Pongracz, P.

    Family dogs successfully follow human-given cues in a two-object choice test. However, whether this ability has any roots in dog-dog visual communication, has been seldom investigated. We designed a test where a video-projected, life-sized dog 'demonstrator' provided directional cues for the...

  3. A comparison of pet and purpose-bred research dog ( Canis familiaris) performance on human-guided object-choice tasks

    Contributor(s):: Lazarowski, L., Dorman, D. C.

    Several studies have shown that domestic dogs respond to human social cues such as pointing. Some experiments have shown that pet dogs outperformed wolves in following a momentary distal point. These findings have lent support to the hypothesis that domestication is responsible for domestic dogs'...

  4. Contagious yawning in domestic dog puppies ( Canis lupus familiaris): the effect of ontogeny and emotional closeness on low-level imitation in dogs

    Contributor(s):: Madsen, E. A., Persson, T.

    Contagious yawning is a well-documented phenomenon in humans and has recently attracted much attention from developmental and comparative sciences. The function, development and underlying mechanisms of the phenomenon, however, remain largely unclear. Contagious yawning has been demonstrated in...

  5. Social distances of goats at the feeding rack: influence of the quality of social bonds, rank differences, grouping age and presence of horns

    Contributor(s):: Aschwanden, J., Gygax, L., Wechsler, B., Keil, N. M.

    To minimize social conflicts between goats and improve pen design, knowledge of factors affecting social distances at the feeding rack is needed. In our study, we investigated the influence of the quality of social bonds, rank differences, grouping age and presence of horns on two types of social...

  6. Docosahexaenoic acid and neurologic development in animals

    Contributor(s):: Heinemann, K. M., Bauer, J. E.

    Analysis of data in puppies has revealed that feeding diets enriched in DHA to the dams during gestation and lactation and after weaning results in the accumulation of DHA in plasma lipids, which is associated with improvements in neurologic development, as indicated by the ERG response....

  7. Behaviour test for eight-week old puppies - heritabilities of tested behaviour traits and its correspondence to later behaviour

    Contributor(s):: Wilsson, E., Sundgren, P. E.

    Play and exploratory behaviour, and behaviour when isolated (total of 10 tests) was tested in 630 German Shepherd puppies at 8 weeks of age. All dogs were also tested at 450-600 days of age using to regimen for selection of service dogs. Significant sex differences were found in 4 of the 10 puppy...

  8. Effect of cage size on the ontogeny of stereotyped behaviour in gerbils

    Contributor(s):: Wiedenmayer, C.

  9. Effect of feed and environmental enrichment on development of stereotypic wire-gnawing in laboratory mice

    Contributor(s):: Wurbel, H., Chapman, R., Rutland, C.

    At 21 days of age, 16 pairs of male ICR laboratory mice were weaned and allocated to 4 treatment groups in a 2 x 2 factorial design matched for genetic background (litter) and body weight. Factor one was the hardness of feed pellets with a significant 2.5-fold difference between soft and hard...

  10. Behavioural observations of puppies undergoing tail docking

    Contributor(s):: Noonan, G. J., Rand, J. S., Blackshaw, J. K., Priest, J.

    Tails were docked from 50 puppies of traditionally docked breeds, and the behaviours were recorded at docking and at 5 second intervals for the first minute followed by 10 second intervals until the pup settled to sleep. All puppies vocalized intensely (shrieking) at the time of amputation of the...

  11. Exposure to video images between 3 and 5 weeks of age decreases neophobia in domestic dogs

    Contributor(s):: Pluijmakers, J. J. T. M., Appleby, D. L., Bradshaw, J. W. S.

    Restricted experience in early life is known to contribute to long-lasting predispositions to fear and anxiety in mammals. It is commonplace for young domestic dogs not to experience many features of the environment in which they will spend their adult lives until after 8 weeks of age:...

  12. Maturation and development of social behaviour during early ontogeny in free-ranging dog puppies in West Bengal, India

    Contributor(s):: Pal, S. K.

    Six bitches and their offspring were observed in the natural environment to study the early ontogeny of certain processes like eye opening, nipple preference, play, sexual activities and locomotion. Thirteen puppies out of 35 survived at the age of 3 months indicating 63% mortality. Eye slits...

  13. Play behaviour during early ontogeny in free-ranging dogs ( Canis familiaris )

    Contributor(s):: Pal, S. K.

    Twenty-four free-ranging dog puppies belonging to six litters were observed from birth to 13 weeks of age to study the play behaviour in early ontogeny. Only a single annual breeding cycle with synchronized breeding season was recorded in this study. Mean litter size was 6.67 ranging from 5 to 8...

  14. Ontogeny of response to humans in handled and non-handled female domestic chicks

    Contributor(s):: Jones, R. B.

    The present study compared the responses of handled and non-handled female chicks to a visible experimenter at 1 of 5 ages (2, 3, 4, 6 or 9 days). Fear of humans was functionally measured in terms of the chicks' approach/avoidance tendencies towards a visible experimenter. Handling, which...

  15. Maternal behavior of Belgian ( Equus caballus ) mares

    Contributor(s):: Barber, J. A., Crowell-Davis, S. L.

    The relationship between ten Belgian mares and their offspring was studied from the first day of foal life to 17 weeks of age. Mares and foals spent more time at greater distances from each other as foals matured. Mares exhibited the recumbency response, being in closer proximity to their foals...

  16. The early ontogeny of bar-gnawing in laboratory gerbils

    | Contributor(s):: Wiedenmayer, C.