Read e-book online Biology of Breeding Poultry (Poultry Science Symposium PDF
By Paul M Hocking
This publication studies the organic technology and history to breeding meat chicken, in particular broiler, turkey and duck. those advertisement birds were replaced by way of genetic choice to such an quantity that they're considerably diverse from conventional breeds and laying hens. overlaying technological know-how, administration and husbandry structures, this complete textual content offers the freshest choice of papers at the subject from a number of foreign specialists.
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Additional resources for Biology of Breeding Poultry (Poultry Science Symposium Series)
Pakdel et al. (2005) concluded that, by using information on QTL that explain only 5% of the genetic variance, ascites could be controlled while still permitting considerable selection response for body weight. An important advantage of having genomic information is that the information is available on all the selection candidates, which makes it possible to differentiate full sib individuals and thus facilitate selection within families. Moreover, no birds need to be euthanized to measure ascites-related traits.
Further advances in hatchery practice may be limited to improving chick viability and subsequent broiler performance. 2). This would indicate that there is opportunity to improve breeder performance by reducing this variation specifically by improving the poorer performing flocks. In almost all data sets there is a skew towards the poorer performing flocks (Fig. 3), which provides an opportunity for overall industry improvement. 82 chicks per year. If a production operation wished to advance more rapidly, by say one more chick, then 20% of the 175 flocks represented in Fig.
5) in which ρ is the ‘accuracy of selection’, which is the correlation between the selection criterion and the TBV of the selection candidate. Below we present accuracies for mass selection, group selection and sib selection schemes. In all cases, the individuals that provide the information for selection are kept in groups of n members but the selection criterion may differ. Mass selection With mass selection, individuals are selected by truncation based on their own phenotypic record only. , 2007): Quantitative Genetics and Genomics ρmass = 37 2 2 σA + (n − 1)σ ADS + r (n − 1)[σ ADS + (n − 1)σ A ] D S σTBV σP .
Biology of Breeding Poultry (Poultry Science Symposium Series) by Paul M Hocking