The largest obstacle facing scientists interested in estimating parameters for wild salmonid populations is the difficulty sampling all (or even most) breeding individuals and their offspring, i.e., difficulty obtaining the samples with which to reconstruct the pedigree (e.g., Dickerson et al. 2005).
Fewer than 80,000 pairs breed in North America, with most breeding on the northeast Atlantic coast and a declining population of less than 10,000 pairs breeding in the Great Lakes region.
Unfortunately, a magnitude 7.1 earthquake hit the Fukui area on 28 June 1948; it completely destroyed the city, and most breeding materials at the station were buried under liquefied soil and lost.
No RVFV strains were isolated from mosquitoes, but the investigations were carried out after most breeding sites had dried up and after the start of a vector control campaign by the Mauritanian authorities, which limited the number of specimens collected.
Most breeding facilities in the United States include both Indian and Chinese-origin rhesus.
However, high crop yield associated with larger grain size and weight has been the objective of artificial selection during most breeding programs.
Most breeding pigs in the U.S. are confined for virtually their entire lives in gestation crates as they endure cycles of repeated impregnation.
While most breeding facilities for laboratory animals do not offer female mate preference, behavioural characteristics of sires that influence mate preference could nonetheless affect maternal investment in offspring.
Alternatively, it might be because the mosquito captures were undertaken at the end of the rainy season, when most breeding sites had dried up and/or due to the intensive use of pesticides to control blood sucking insect vectors during outbreak.
Improvement of yield potential is the most important goal of most breeding programs worldwide.
