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  1. Exposing avian embryos to light affects post-hatch anti-predator fear responses

    Contributor(s):: Archer, Gregory S., Mench, Joy A.

    Environmental stimuli present during incubation can impact the behavior of birds post-hatch. To determine the effect of exposing broiler chicken embryos to light on fear-related behavior post-hatch, we conducted two experiments in which we incubated eggs under various light schedules, and then...

  2. Influence of egg oiling on colony presence of ring-billed gulls

    Contributor(s):: DeVault, Travis L., Schmidt, Paige M., Pogmore, Fred E., Gobeille, John, Belant, Jerrold L., Seamans, Thomas W.

  3. Mate choice, maternal investment and implications for ostrich welfare in a farming environment

    Contributor(s):: Bonato, M., Cherry, M. I., Cloete, S. W. P.

    At present, the ostrich industry is inefficient, on account of being characterised by inadequate egg production, high embryo mortality, poor chick survival and suboptimal growth rates. However, as ostrich farming commenced only in the mid 19th century in South Africa, farmed ostriches have had a...

  4. Morphological and Immunohistochemical Features of the Vomeronasal System in Dogs

    Full-text: Available

    | Contributor(s):: Salazar, Ignacio, Cifuentes, Jose M., Sanchez-Quinteiro, Pablo

    Each of the structures integrating the sense of smell in mammals has a different degree of development, even in the so‚Äźcalled macrosmatic animals, according to the capacity of the olfactory system to detect thousands of different chemical signals. Such morphological diversity implies analogous...

  5. Human-animal interaction, stress, and embryo production in Bos indicus embryo donors under tropical conditions

    | Contributor(s):: Macedo, G. G., Zuccari Neto, C. E. S., Abreu, U. G. P. de, Negrao, J. A., Costa e Silva, E. V. da

    This study investigated the effect of human-animal interaction (HAI) and the stress response on the quality of embryo production in superovulated Nelore (Bos indicus) cattle, under tropical conditions. Thirty-two females underwent a superovulation protocol for 5 days. Cortisol concentrations were...

  6. Further evaluation of the developmental asynchrony hypothesis of sex ratio variation

    | Contributor(s):: Krackow, S.

    A discussion of differences in the speed of development of male and female blastocysts up to the stage of uterine implantation compared with the developmental stage of the uterus may cause sex ratio biases in response to environmental, physiological and psychological cues. It may also cause sub...

  7. Relevance of brain and behavioural lateralization to animal welfare

    | Contributor(s):: Rogers, L. J.

    The left and right sides of the brain are specialised to process information in different ways and to control different categories of behaviour. Research on a range of species has shown that the left hemisphere controls well-established patterns of behaviour performed in non-stressful situations,...

  8. Ewe-ewe and ewe-lamb behaviour in a hill and a lowland breed of sheep: a study using embryo transfer

    | Contributor(s):: Dwyer, C. M., Lawrence, A. B.

    The social behaviour of Suffolk and Scottish Blackface ewes was investigated over 2 years in 2 different environments. The effect of lamb behaviour on the behaviour of the ewe was investigated in an embryo transfer study between the breeds resulting in 4 combinations of ewe and lamb (25 Blackface...

  9. Of elephants and embryos: A proposed framework for legal personhood

    | Contributor(s):: Jessica Berg

  10. Effects of relatedness on the suckling behaviour of calves in a herd of beef cattle rearing twins

    | Contributor(s):: Waltl, B., Appleby, M. C., Solkner, J.

    The behaviour of 10 cows, each with twin calves, was observed during two 10-day periods in early and late summer. Behaviour was recorded using focal-sampling procedures and sucking behaviour was recorded continuously for all calves. Eight of the 10 cows were mothers of twins, consisting of one...

  11. Social dominance of female dairy goats and response to oestrous synchronisation and superovulatory treatments

    | Contributor(s):: Ungerfeld, R., Gonzalez-Pensado, S., Dago, A. L., Vilarino, M., Menchaca, A.

    Two experiments were performed to determine if there is a relation between the goat's hierarchical position, and (1) the conception rate and litter size obtained with hormonal oestrous synchronisation treatments and fixed timed artificial insemination, and (2) the number of corpus luteum (CL) and...

  12. Onset of sentience: the potential for suffering in fetal and newborn farm animals

    | Contributor(s):: Mellor, D. J., Diesch, T. J.

    Sentience and consciousness are prerequisites of suffering. Thus, animals must have sufficiently sophisticated neural mechanisms to receive sensory information and to transduce this information into sensations, and they must also be conscious to be able to perceive those sensations. Moreover,...

  13. Behavior and development in offspring from interspecies embryo transfer: theoretical issues

    | Contributor(s):: Gibbons, E. F., Jr., Durrant, B. S.

    A discussion. Previous successful inter-specific embryo transfers are described, including mouflon (Ovis musimon) lambs born to domestic sheep (Ovis aries), an Indian gaur (Bos gaurus) calf born to a domestic cow (Bos taurus), and banteng (Bos javanucus) embryos transferred to B. taurus cows. The...

  14. Effects of embryonic corticosterone exposure and post-hatch handling on tonic immobility and willingness to compete in chicks

    | Contributor(s):: Janczak, A. M., Heikkila, M., Valros, A., Torjesen, P., Andersen, I. L., Bakken, M.

    Previous experiments indicate that artificial elevation of egg corticosterone content prior to incubation may increase fear of humans, reduce the willingness to compete with conspecifics and reduce the growth rate of chicks hatching from these eggs. It can also be hypothesized that...

  15. Genetic engineering and animal welfare

    | Contributor(s):: Fox, M. W.

  16. Killing day-old chicks? Public opinion regarding potential alternatives. (Special Issue: Knowing animals.)

    | Contributor(s):: Leenstra, F., Munnichs, G., Beekman, V., Heuvel-Vromans, E. van den, Aramyan, L., Woelders, H.

    Throughout the world, male chicks from layer breeds are killed just after hatching, as they are not profitable as regards the production of meat. The Dutch and European parliaments have insisted on research into possible alternatives to the killing of day-old chicks. In the present study we have...