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Variation in growth efficiency and body composition due to genetic factors



Variation in growth efficiency and body composition due to genetic factors



Revista Portuguesa de Ciencias Veterinarias 91(519): 152-161



There is often some confusion about the real meaning of results from different developmental studies of the body. This is due both to the complexity of the factors involved and to the difficulty of getting appropriate reference parameters. In fact, most differences referred to in the literature concerning growth efficiency and/or body composition between different selection lines, breeds or even species are explained by different degrees of maturity of the animals studied. Within this general pattern there is however some variation left (specially in adipose tissue, in what concerns to body composition) as it has already been shown in selection programs. In addition, some unexpected findings in studies with feral species and the interaction between genetic potential for growth and development of the different body tissues, and food availability, in terms of total availability and seasonal variation, suggest some hypothesis for further studies.

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