Báo cáo sinh học: "Familial versus mass selection in small populations" pps

... D. Couvet regime in nature is restricted [22], and the main interest in studying familial selection resides in the potential applications of familial selection in captive breeding programs. The ... adults in the next generation. Selection acts among offspring within families and not among the entire set of offspring produced in the population as in t he case of mass or o...

Ngày tải lên: 14/08/2014, 13:22

... in the discussion section. 2.1. The linear reaction norm model The model was a linear reaction norm function for a single trait. In the fol- lowing, the intercept and linear coefficient of a linear ... can be included in the breeding objective to avoid that the animals become increasingly sensitive to, e.g., feed quality or disease. Since the genetic change in slope is a function of the...

Ngày tải lên: 14/08/2014, 13:22

... exposed by being nocturnal or inhabiting caves. Thus species, with lower exposure during their sensitive stages, and/or less exposure to their gametic material finally, will ... may &dquo;trigger&dquo; natural selection by providing more variability and genetic drift there by increasing genetic isolation. Another outcome, is the increased gen...

Ngày tải lên: 14/08/2014, 19:23

... submatrix pertaining to QTL effects of parents of finals and ancestors using marker information on the entire pedigree including final offspring. This submatrix is then inverted, ... contributions of final offspring, computed with known parental linkage phases, are added into the inverse. Note that in the RAM in [4], offspring contributions app...

Ngày tải lên: 09/08/2014, 18:22

... variance-covariance matrix becomes approximate due to uncertain linkage phases in parents of final offspring, and other ways of computing this inverse exactly (eg, Van Arendonk et al, 1994) ... Statistical mapping of polygene loci in livestock. Proc Int Biometric Soc (in press) in the simulation, and data sets were analyzed by ignoring rel...

Ngày tải lên: 09/08/2014, 18:22

... has been found in any strain of D subobscura. and some of them seem to be located in the heterochromatin. Preliminary in situ hybridization results, using as probe a ... differently in the 4 Sophophora lineages. While in willistoni-saltans lineages these P sequences have remained from these times (and moreover they are active in D willi...

Ngày tải lên: 14/08/2014, 20:20

... McKay [4] and is the inverse of twice the increase in inbreeding. All inbreeding values [27] were computed (starting from zero in generation 0), assuming an ideal state of ... example, restricted matings obtained by linear programing [23] minimise the average coancestry coefficients but only in the first generation, having a negative effect i...

Ngày tải lên: 09/08/2014, 18:21

... gradient with 2%. Fractions were collected in 5 minute intervals for the first 20 min and then in 2 min intervals for 60 min. The final 7 min was collected in one final fraction. A speed-vac was used ... protein kinase and two phosphate acceptor proteins from vaccinia virions. J Biol Chem 1975, 250(7):2430-2437. 57. Lin S, Broyles SS: Vaccinia protein kinase 2: a second essential serine...

Ngày tải lên: 19/06/2014, 08:20

... genetic response in maternal effects is predicted, but is subject to uncertainty in preweaning genetic parameters. This is relatively disappointing since improving maternal effects ... and combines both AI and NS bull selection. Selection is performed in a sequential way with independent culling levels on individual and progeny performance. Com...

Ngày tải lên: 09/08/2014, 18:21

... genetic gains in direct and maternal effects are due to AI sire selection and dam selection respectively. Taking into account sampling uncertainty in estimates of preweaning genetic ... gains can be obtained by concentrating AI in only a fraction of the herds instead of keeping the same lower rate in all herds. An application concerns...

Ngày tải lên: 09/08/2014, 18:21