Dimensional analysis of milk fat globules in sow milk: effects of the lactation stage and fat content and comparison with vaccine milk

Abstract

To assess the differences in the granulometry of milk fat globules between swine and bovine species, milk samples from 30 lactating sows were analyzed for fat globule dimensions and compared with cow milk samples. Results showed differences between the fat globules: sow milk presents reduced globule diameters compared with cow milk (volume-weighted diameter 2.62 vs. 3.27 µm, p<0.001) and reduced interglobular distance. A positive relationship was observed between milk fat content and globule diameter, while a slight, insignificant inverse trend was detected between the day of lactation and fat globule diameter. These complex interactions between milk lipids, globule membrane proteins, and globule dimensions provide a better understanding of digestion/absorption phenomena in the design of milk replacers.

Effects of feeding sodium stearoyl-2-lactylate diets to lactating sows on performance, digestibility of nutrients, composition, and fat globule size in milk1

“…They are composed of a triglyceride core and are surrounded by a natural biological membrane (Fauquant et al, 2005). Faustini et al (2010) concluded that MFG diameter increases with milk fat content, whereas an inverse relationship, although not significant, was observed between globular diameter and lactation day. Wiking et al (2003) reported that the MFG in milk had a high level of fat with a large average diameter.…”

“…Little research has studied the effects of SSL on MFG size and the composition of sow milk. In sow milk, MFG are differently dispersed with reduced diameters, which offers a greater attack surface compared to bovine milk (Faustini et al, 2010). They are composed of a triglyceride core and are surrounded by a natural biological membrane (Fauquant et al, 2005).…”

“…These observations can help us to achieve a better understanding of the relationships between MFG diameter, lipid composition, and the nutritional characteristics of milk. Milk fat globules can be seen as lipoprotein complexes with micro-and nanoparticle characteristics (Argov et al, 2008) that influence the processes of release and absorption in the gut (Argov et al, 2008;Faustini et al, 2010). Soybean lecithin is a natural surfactant, and the presence of a single surfactant results in a dramatic lowering of the MFG size; the near absence of surfactants results in a larger value for the size of the fat globules (Robin et al, 1992).…”

A Comparative Study of Some Estimation Methods in Simple Linear Regression Model for Different Sample Sizes in Presence of Outliers

“…The main propose of robust regression is to provide resistant (stable) results in the presence of outliers (Chen, 2002). Applications of robust regression methods in animal researches began to increase with the availability of related computer packages (Çankaya et al, 2006;Çankaya, 2009;Faustini et al, 2010;Yadav et al, 2011). To our knowledge, there is incomplete knowledge on comparative studies of LS and robust regression methods for different sample size and on comparison of estimation methods for parameters of regression model in animal science.…”