Decades of performance recording and rigorous selection has made the Large White more prolific than most rare breeds. Internationally the breed is more commonly known as the Yorkshire, after the area where it was developed. 2. Typically the heritability of VE is under 10%, but its genetic coefficient of variation is typically 20% or more. There is, moreover, strong evidence of a negative correlation between the additive genetic values affecting litter size and those affecting residual variance. The growth in performance recording and the increasing specialisation of the world pig industry led to further demand for the Large White and the breed became known as “The World’s Favourite Breed”. Terminal sire on rare breeds- Produces a lean, fast growing pig more suited to the commercial market. The low correlations between parities indicate that different genes are respon-sible for litter size in different parities. 62 in Sorensen & Waagepetersen (2003). The breed is known for having an excellent F.C.R. This work reports the results of a genetic analysis of adult weight in the snail Helix aspersa. Sows are milky and make for good mothers. They mainly depend on genetic correla-tions between litter size in subsequent parities, size of data set, capacity of computing etc. Increasing litter size has long been a goal of pig breeders and producers, and may have implications for pig (Sus scrofa domesticus) welfare. It is also known as the Yorkshire pig and the English Large White pig.. Phenotypic plasticity and canalization are important topics in quantitative genetics and evolution. The possibility of manipulating environmental variance by selection is illustrated numerically using estimates of parameters derived from the snail data set. Key words: pigs / genetic parameters / litter size / local breed / multiple trait model for litter size as one of the most important traits in pig breeding. (daily liveweight gain). Maternal genetic variance for the change in within-litter SD in piglet weight during suckling was assessed from the estimated additive genetic covariance components by conditioning on within-litter SD in birth weight. The Large White is widely used in outdoor systems and is hardy enough to cope with most conditions. In conclusion, 14 or more teat number compared to 11-13 teat number in gilts increased litter size at birth and at 21 day weaning. Commercial sire line- There are strains of Large White that have been specifically bred and selected to be terminal sires for intensive systems. Similarly, mean growth of piglets during suckling was assessed from the additive genetic covariance components by conditioning on mean weight at birth. The following seven traits were analysed in a multivariate animal (sow) model: number of piglets born alive, within-litter SD in birth weight, within-litter SD in piglet weight at 3 wk of age, mean weight at birth, mean weight at 3 wk of age, proportion of stillborn piglets, and proportion of dead piglets during suckling. Such variation may be either between repeated expressions of the same trait within individuals (e.g. Multiple trait analysis supposes subsequent observations to be different traits. Teat interval from pectoral to inguinal region and from left to right at first estrus and mating did not show any differences among the breeds. There are several approaches regarding the method for genetic evaluation of litter size. The phenotypic and genetic relations between litter size traits, piglet mortality during farrowing and from birth to weaning and several statistics referring to the distribution of the birth weight within litter were analyzed. Several models of heterogeneous variance are fitted using a Bayesian, MCMC approach. The breed is ideally suited to an intensive system and the high levels of management and data recording in such a system can bring out the best in the breed. For more information please visit British Pig Association. 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