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Body composition is presented by densitometry as a sum of fat mass, non-bone lean mass (muscle mass) and bone mineral content (Rothney et al., 2009). Content of the first two components, especially fat, can influence bone size, mineral content and density in adolescents (Janicka et al., 2007; Farr et al., 2010; Cole et al., 2012; Mosca et al., 2014) and adults (Reid et al., 1992; Kirchengast et al., 2001; Hsu et al., 2006; Dytfeld et al., 2011). The results of recent works (Wetzsteon et al., 2008; Aguirre et al., 2014) indicated also that the proportion between fat : lean mass in the body has an important meaning. However, results of these studies, carried out using both dual energy X-ray absorptiometry (DXA), computed tomography (CT) and peripheral quantitative computed tomography (pQCT) method, are divergent. Additionally, some authors (Reid et al., 1992) pointed out that relationship between fat and bone understood as whole body mineral density is influenced by sex and is significant in females but much weaker in males. Mosca et al. (2014) reported higher negative relationship between body fat and whole body bone mineral content in males, whereas in females such relationship was observed in femur and spine. ABSTRACT. The aim of this study was to investigate a morphometry (bone mass), densitometry (mineral content, mineral density measured using dual energy X-ray absorptiometry (DXA) method), geometry (cortical wall thickness, cross sectional area, cortical index) and bone strength in weaned female piglets growing from 56 to 115 day of life and differed in body fatness understood as fat : lean mass ratio established using DXA. Correlations between measured properties and body fatness were also considered. Sixteen 56-day old crossbreed piglets were allotted into two experimental groups (8 animals in each): thin – T (fat : lean mass ratio <0.12) and fat – F (fat : lean mass ratio >0.12), based on fat : lean mass ratio in the body. Both groups of pigs were fed the same diet ad libitum (13.5 MJ · kg-1 metabolizable energy, 10.5 g of digestible lysine per kg). At 115 day of life the T animals had heavier bones (P < 0.01), higher bone mineral content (P < 0.01), higher bone mineral density (P < 0.05), higher cortical wall thickness (P < 0.01) and cross sectional area (P < 0.01) in comparison to F pigs. Bone strength and cortical index did not differ between groups. Body fatness was negatively correlated with: bone weight (r = −0.55, P = 0.001), bone mineral content (r = −0.52, P = 0.001), bone mineral density (r = −0.27, P = 0.029), cortical wall thickness (r = −0.38, P = 0.002) and cross sectional area (r = −0.57, P < 0.001). Correlations with bone strength and cortical index (relative proportion of cortical bone to total periosteal breadth at midshaft) were insignificant. Received: 25 March 2016 Revised: 20 June 2016 Accepted: 25 November 2016

Bone mineralization, geometry and strength in pigs growing from 56 to 115 day of life as affected by body fatness