Effects of growth-promoting technology on feedlot cattle behavior in the 21 days before slaughter
Contributor(s):: Stackhouse-Lawson, K. R., Tucker, C. B., Calvo-Lorenzo, M. S., Mitloehner, F. M.
There is growing interest in the animal welfare implications of growth-promoting technology used in feedlot cattle, namely hormonal implants, ionophores, antibiotics and β 2-adrenergic agonists. Previous studies have focused on the effects of implants on aggression, but little work has...
If you knew what was good for you! The value of environmental enrichments with known welfare benefits is not demonstrated by sows using operant techniques
Contributor(s):: Elmore, M. R. P., Garner, J. P., Johnson, A. K., Kirkden, R. D., Richert, B. T., Pajor, E. A.
This study assessed the motivation of gestating sows housed in standard, barren gestation stalls (used for breeding/implantation and/or gestation) for access to environmental enrichment. Enrichment consisted of a cotton rope or rubber mat in comparison to positive (additional food when fed at...
Use of visual and permanent identification for pets by veterinary clinics
Contributor(s):: Dingman, P. A., Levy, J. K., Rockey, L. E., Crandall, M. M.
It is estimated that more than 5 million stray dogs and cats enter animal shelters in the USA each year, but less than half are ever reunited with their owners. Lost pets with identification microchips are up to 21 times more likely to be reunited than those without. Finders of lost pets are more...
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...
A modified HET-CAM approach for biocompatibility testing of medical devices
Contributor(s):: Eder, C., Falkner, E., Mickel, M., Chiari-Grisar, C., Appl, H., Schoffl, H., Nehrer, S., Losert, U. M.
The implantation of new biomedical devices into living animals without any previous toxicity or biocompatibility evaluation is possible under current legislation. The HET-CAM (Hen Egg Test-Chorionallantoic Membrane) test offers a partially immunodeficient, borderline in vitro/in vivo test system...
Intra-abdominal transmitter implantation in mice: effects on behaviour and body weight
Contributor(s):: Baumans, V., Bouwknecht, J. A., Boere, H., Kramer, K., Lith, H. A. van, Weerd, H. A. van de, Herck, H. van
Potential behavioural indicators of post-operative pain in male laboratory rabbits following abdominal surgery
Contributor(s):: Farnworth, M. J., Walker, J. K., Schweizer, K. A., Chuang, C. L., Guild, S. J., Barrett, C. J., Leach, M. C., Waran, N. K.
This study aimed to identify behaviours that could be used to assess post-operative pain and analgesic efficacy in male rabbits. In consideration of the 'Three Rs', behavioural data were collected on seven male New Zealand White rabbits in an ethically approved experiment requiring abdominal...