Abstract. We study the linear stability of flock and mill ring solutions of two individual based models for biological swarming. The individuals interact via a nonlocal interaction potential that is repulsive in the short range and attractive in the long range. We relate the instability of the flock rings with the instability of the ring solution of the first order model. We observe that repuls...

Early decision making in commercial livestock systems is key to maximising animal welfare and production. Detailed information on an animal’s phenotype needed facilitate this, but can be difficult obtain a setting. Research into the use of bio-logging sheep continuously monitor individual behaviour indirectly inform health production has seen rapid growth recent years. Much this research, howev...

Two flocks of ewes were used as sources of embryos for embryo transfer programs: a Merino flock comprising 3 lines differentially selected on weaning weight and a Coopworth flock consisting of three lines differentially selected for backfat thickness. Effects of embryo genotype, year of transfer, sire and number of embryos transferred on embryo survival were examined. No significant line or sir...

It is known, via algebraic methods, that a flock of a quadratic cone in PGð3; qÞ gives rise to a family of qþ 1 ovals of PGð2; qÞ and similarly that a flock of a cone over a translation oval that is not a conic gives rise to an oval of PGð2; qÞ. In this paper we give a geometrical construction of these ovals and provide an elementary geometrical proof of the construction. Further we also give a...

Sheep production is present on all continents and has been practiced in Brazil since the colonization. In this study, the multitemporal dynamics of sheep production in Brazil is examined using official government data (Brazilian Institute for Geography and Statistics-IBGE) from 1976 to 2010. Maps of flock growth rates and growth acceleration maps by municipality were elaborated. The Southern st...

The wide deployment of location detection devices (for example, smartphones) leads to collecting of large datasets in the form of trajectories. There are a whole set of papers devoted to trajectory-based queries. Mostly, they are concentrated on similarity queries. In the same time, there is a constantly groving interest in getting various forms for aggregating behavior of trajectories as group...

Campylobacter is the commonest bacterial cause of gastrointestinal infection in humans, and chicken meat is the major source of infection throughout the world. Strict and expensive on-farm biosecurity measures have been largely unsuccessful in controlling infection and are hampered by the time needed to analyse faecal samples, with the result that Campylobacter status is often known only after ...