The article compares the reproductive qualities of sows Danish selection obtained by different breeding methods during their seven farrowings in one farm. It was found that local F1 from mothers Landrace breed and boars Large White had a significant excess total number piglets at birth over analogs backcrossing two-breed with 0.90 head or 5.92 % (p<0,001). Both purebred significantly exceede...

Grain yield is strongly influenced by the environment, has polygenic and complex inheritance, and is a key trait in the selection and recommendation of cultivars. Breeding programs should efficiently explore the genetic variability resulting from crosses by selecting the most appropriate method for breeding in segregating populations. The goal of this study was to evaluate and compare the genet...

Survival data were simulated under the Weibull model in a half-sib family design, and about 50% of the records were censored. The data were analysed using the proportional hazard model (PHM) and, after transformation to survival scores, using a linear and a binary (logit) model (LIN and BIN, respectively), where the survival scores are indicators of survival during time period t given survival ...