Biochemical alteration of some serum constituents in laying hens supplemented by high fat rations

For performing this study, 40 pullets were divided classified into four equal group, one given basal diet only, 2[nd] group kept on basal diet plus beef tallow, 3[rd] group given basal diet plus linseed oil and the last group was supplemented with basal diet and olive oil. Blood samples were collected 4 and 8 weeks post-treatment and the obtained results revealed that the total serum lipids, cholesterol and triacylglycerol, were significantly increased at eight weeks in beef tallow and linseed oil treated group while, they were greatly decreased in olive oil treated group. On the other hand, the serum proteins values were significantly decreased in all treated birds after 8 weeks. The present work provides evidence that all types of lipids used in this work significantly decreased the concentration of serum calcium, phosphorus, magnesium, iron while, most of them increased the serum copper concentration