فهرست مطالب قدرت الله میرزاده

This study was conducted to investigate the effects of using Gracilariopsis persica in layer diet on performance، egg quality and lipids of blood serum of layer hens. One-hundred Hy-line W-36 hens were allocated to five dietary treatments (experimental diets containing 0، 5، 10، 15 and 20 percent seaweed) and five replicates and four birds in each for 12 week period (23-34 week of age). The results showed that in the birds fed diets containing more than 5% seaweed، had lower egg production and higher feed conversion ratio (P<0. 05). There was significant decrease in egg mass for more than 10% seaweed in experimental diet (P<0. 05). Inclusion of Gracilariopsis persica in diets increased egg shell thickness and egg density compared to control diet (P<0. 05). The egg that laid by hens fed on diets containing different levels of Gracilariopsis persica had lower concentration of Malonedialdehyde and higher iodine content than those laid by control birds (P<0. 05). Using Gracilariopsis persica in diets had no significant effect on yolk cholesterol، however، its inclusion at 15 or 20% in diet، decreased cholesterol concentration of blood serum (P<0. 05). These results demonstrated that Gracilariopsis persica can be include up to five percent in layer diets. It improves eggshell thickness and egg density، and also increases iodine content in yolk and the egg durability.

This study was conducted to determine the nutritional value of seaweed Gracilariopsis persica and to evaluate its utilization in layer nutrition. Metabolizable Energy and chemical composition of seaweed were measured. 100 Hy-line W-36 hens were allocated to five dietary groups with five treatment group (experimental diets containing zero, five, 10, 15 and 20 percent seaweed) and it lasted for 12 weeks. Egg production, feed intake, feed conversion ratio, egg weight and egg mass were measured weekly. The results showed that the CP, CF, EE, Ca and P of the seaweed were 23.05, 7.2, 0.1, 0.9 and 0.34 percent, respectively. Apparent Metabolizable Energy and Apparent Metabolizable energy corrected for nitrogen were 2185.04 and 2195.72 Kcal/Kg, respectively. The treatments contain more than five percent seaweed, decreased egg production and increased feed conversion ratio (P< 0.05). There was significant decrease in egg mass for more than 10 percent seaweed treatments (P< 0.05). These results showed that usage of five percent seaweed Gracilariopsis persica in the layer hen's diet doesnt have negative effect on production performances.