Abstract Background The availability of both pedigree and genomic sources information for animal breeding genetics has created new challenges in understanding how they can be best used interpreted. This study estimated genetic variance components based on compared these to the from alone a population generated estimate non-additive variance. Furthermore, examined impact assumptions Hardy–Weinberg equilibrium (HWE) estimates components. For first time, magnitude inbreeding depression...

The farming of Atlantic salmon has become an important industry in several countries, and breeding programmes have been implemented to improve genetic performance adaptation farm environments. Founder stocks used the Norwegian programme originated solely from rivers no extrinsic genes introduced. majority (more than 90%) additive variation populations found within, not between, river strains. comprises four sub-populations. In event reduced variability due random drift closed populations,...

Despite being the second most important aquaculture species in world accounting for 7.4% of global production 2015, tilapia has lacked genomic tools like SNP-arrays and high-density linkage maps to improve selection accuracy accelerate genetic progress. In this paper, we describe development a genotyping array containing more than 58,000 SNPs Nile (Oreochromis niloticus). were identified from whole genome resequencing 32 individuals commercial population Genomar strain, selected SNP-array...

Abstract Background In a previous study, we found low persistence of linkage disequilibrium (LD) phase across breeding populations Atlantic salmon. Accordingly, observed no increase in accuracy from combining these for genomic prediction. this aimed to examine if the same were true detection power genome-wide association studies (GWAS), terms reduction p-values, and precision mapping quantitative trait loci (QTL) would improve such analysis. Since individual records may not always be...

Genetic variation in susceptibility of Atlantic salmon, Salmo salar L., to furunculosis, bacterial kidney disease (BKD) and cold water vibriosis was studied by challenge testing one-year-old fingerlings. Fish from 81 full-sib families within 32 sire progeny groups were infected with Aeromonas salmonicida, Renibacterium salmoninarum Vibrio salmonicida. Estimated heritabilities relatively low, being highest for BKD (h2= 0.23) lowest 0.13). correlations between the ability survive diseases all...

An ongoing crossbreeding experiment is being conducted with the objective of producing dual purpose synthetic chicken for village poultry production in Ethiopia. The two exotic breeds used were Fayoumi (F) and Rhode Island Red (R) as dam line, whereas indigenous Naked neck (N) local Netch (W); a white feathered chicken. sire line to produce hybrids FN (F& X N%) RW (R& W%). Growth egg performance crosses compared each other pure performance. Both body weight was improved while reduced, age at...

There are only few studies of dominance effects in non-inbred aquaculture species, since commonly used mating designs often have low power to separate dominance, maternal and common environmental effects. Here, a factorial design with reciprocal cross, rearing eggs subsequent lifecycle stages pedigree assignment using DNA microsatellites was these estimate (d2) (m2) ratios Nile tilapia for six commercial traits. The study included observations on 2524 offspring from 155 full-sib families....

Abstract Background The accuracy of genomic prediction is partly determined by the size reference population. In Atlantic salmon breeding programs, four parallel populations often exist, thus offering opportunity to increase set combining these populations. By allowing a reduction in number records per population, multi-population can potentially reduce cost and welfare issues related recording traits, particularly for diseases. this study, we evaluated multi- across-population values...

Abstract. The feasibility of including individual records on correlated traits in a family selection programme which aims to increase resistance furunculosis Atlantic salmon was studied; markers were selected because their potential role the pathogenesis disease. Fibrinogen and α 2 ‐antiplasmin both show genetic variation; are with survival after challenge Aeromonas salmonicida , correlation being 0·44 0·37 ( P < 0·05), respectively, it is possible measure large scale at low costs....

The aim of this study was to investigate whether observed time-until-death Atlantic cod (Gadus morhua L.) juveniles in separate challenge tests with Vibrio anguillarum (causes vibriosis) and nodavirus [causes viral nervous necrosis (VNN)] are due differences susceptibility (whether at risk or not) increased endurance (individual hazard, given that the animal is susceptible) using a cure mixture (CURE) model Gibbs sampling. Observed time-until-death, prepared as sequential binary records,...

This work examined behavioural responses in yolk‐sac rainbow trout Oncorhynchus mykiss larvae originating from strains selected for high (HR) or low (LR) plasma cortisol response to a standardized stressor. The results showed that the HR strain were more sensitive environmental stressors, they shorter reaction time oxygen levels. Previous studies on adult and juvenile individuals these demonstrated number of correlated physiological differences. In larvae, growth development depended mainly...