In captivity, some species often seem to thrive, while others are often prone to breeding problems, poor health, and repetitive stereotypic behaviour.
Often, once strains are no longer under active investigation, they are reduced to only a few breeding pairs, placing them at risk from breeding problems, genetic drift, and genetic contamination.
The groups say high water flows in parts of the river in the summer cause nesting and breeding problems for at least two species of birds and one type of fish.
It is striking to note that for the past many years, research on practical agronomical and breeding problems has been quite active in these countries and current ly attempts to improve rye are being made on modern lines.
Another study, also published today in Nature, delivers additional evidence that the insecticides can have negative effects on bees: Bumblebees in particular experienced slower colony growth rates and breeding problems among females.
Meanwhile, as the complexity of the trait increase, breeding problems increase, for example, favorable alleles in exotic genetic resources are in unadapated genetic backgrounds and linked to other unfavorable alleles.
Thus, our simple discrete model of the animal breeding problem provides a novel viable and robust approach to designing and comparing breeding strategies in captive populations.
In this paper, we propose the first discrete model of the controlled animal breeding problem and analyse heuristics for two possible objectives: (1) breeding for maximum diversity and (2) breeding a target individual.
Two cross-validation schemes, CV1 and CV2, were considered in the study based on different prediction purposes relevant to practical breeding problems (Calus and Veerkamp 2011; Burgueño et al. 2012).
In part, the paucity of information reflects the difficulties of working with global COX-2 knock out mice, which have breeding problems, severe renal pathology and a shortened life span [ 39], none of which are encountered in our targeted COX-2MECKO mice, as well as the extensive use of immune deficient host mice for tumor transplant studies.
