Evaluation of guar meal korma feed as a feed ingredient for and some feed additives feeding local laying hens silver montazah.

The present study was carried out to study the effect of guar meal korma (GMK) as a feed ingredient and some feed additives on growth performance, egg production, digestibility coefficients of dietary feed nutrients and economic efficiency of egg production of Egyptian Silver Montazah (SM) local laying hens. A 4x3 factorial arrangement design was used in this experiment including four levels of GMK (0, 5, 10 and 15 %) and three sources of feed additives, 0, Avizyme 750 mg/kg diet and Probiotics 250 mg/kg diet. A total number of 288 laying hens and 36 cocks of SM local strain, 22 weeks old, were used in this experiment. All birds were randomly distributed into 12 treatment groups (24 hens and 3 cocks / each treatment). Each group was sub-divided into three replicates of 8 hens and one cock. Laying hens of each group were nearly of equal average body weight and similar average daily egg production. Results obtained at the end of the experiment ( 36 weeks of age) showed that average live body weight of layers was significantly (P<0.01) affected by dietary GMK level, whereas dietary feed additive sources had no significant effect on average live body weight of hens. The heavier live body weight was attained by layers fed diets contained 5% dietary GMK level and supplemented with Probiotics. Dietary GMK levels and feed additive sources had no significant effect on average daily feed intake of layers.  The higher average daily feed intake was recorded by hens fed dietary 0.0%GMK level supplemented with Probiotics. No significant differences were detected in average feed conversion due to dietary GMK levels effect. Also, feed conversion ratio was not significantly affected by feed additives supplementation. The best feed conversion ratio was recorded for layers fed the diet contained 0.0% GMK level and supplementation with Avizyme. Dietary GMK levels and feed additives supplementation had no significant effect on averages of all egg production traits (egg production rate, egg weight and egg mass) of layers at 36 weeks of age. The higher of egg production rate and egg mass were shown by layers fed the diet with 0.0% GMK level and supplemented with Avizyme, while the higher of egg weight was recorded by hens fed the 10% dietary GMK level and Probiotics supplementation. Digestibility coefficients of all feed nutrients of the experimental diets except CP digestibility were significantly (P<0.05) affected by dietary GMK level. Whereas, dietary feed additives supplementation had no significant effect on digestibility of all feed nutrients except for CP digestibility. Layers fed the 0.0% dietary GMK level and Probiotics supplementation showed higher digestibility coefficients for all feed nutrients. Dietary 15 % GMK level recorded the higher (best) relative economic efficiency percentage, and diets supplemented with Avizyme attained the best relative economic efficiency value. Birds fed 0 % dietary GMK level and dietary Avizyme supplementation showed the best relative economic efficiency value.