Yes! Five million animals are killed yearly in America's shelter system; over-breeding, lack of mandatory spay-neuter laws and America's obsession with "that cute puppy in the window".
These snakes, which now number in the thousands, again, because of breeding and lack of natural predators, are responsible for the extirpation of 10 native songbirds, several different lizards, and bats.
The high degree of spatial fidelity can lead to severe consequences for ringed seals in the southern distribution areas (the Gulf of Finland and the Estonian coastal waters), where breeding has failed repeatedly over the last decades due to lack of breeding ice.
To avoid possible effects of lack of breeding sites (nestboxes), one nestbox next to the box where the females were breeding was sealed to prevent other species (e.g. flycatchers) to nest in these boxes.
In 1921, because of the lack of breeding stallions in Italy, a crossbred Sardinian-Arabian stallion was used for the Haflinger breeding program, as well as many lower-quality purebred Haflingers.
The success rate of using QTLs in molecular breeding reflects the lack of repeatability of QTL effects across genetic backgrounds and environments (Bernier et al. 2008).
From a breeding standpoint, the lack of any field selection might be considered inefficient, even antithetical to the improvement and longevity of the variety.
But, within the breeding efforts, the lack of sufficient molecular markers in tomato has been a bottle neck in genetic and linkage studies.
Thinking that the disease may result from a combination of "hits" to several different genes, Accili and his colleagues attempted to recreate diabetes symptoms by breeding mice lacking half their copies of two genes.
Also, a lack of breeding grounds can be excluded, since shallow gravel banks exist at both sampling sites.
