Effect of Using Different Guar Meal Levels and Β– Mannanase Supplementation on Productive Performance of Golden Montazah Laying Hens

Abstract

This experiment was carried out to evaluate the effect of dietary guar meal levels with or without β-mannanase on layer performance. One hundred and sixty eight 22-week-old Golden Montazah pullets divided randomly into seven treatment groups each group had 24 pullets divided into three replicates with 8 pullets per each. The 1 st group fed on corn-soybean meal diet and served as control group. The 2 nd , 4 th and 6 th groups fed on diets contain 5%, 10% and 15% guar meal respectively without βmannanase. The 3 rd , 5 th and 7 th groups fed on diets contain 5%, 10% and 15% guar meal with 250 mg/kg β-mannanase respectively. The experiment was extended for three months to estimate production performance. At the end of the experiment egg quality was assayed and slaughter assay was conducted. The following results were obtained:-Adding 10% guar meal had no harmful effects on egg production performance, however increasing guar meal up to 15% retarded clearly egg production performance compared with control. Remarkable improvements in production performance were observed when β-mannanase supplemented to guar diets. Significant improvement in shell weight percent and shell thickness were observed by increasing guar level up to 15% with or without β-mannanase compared with control treatment, in contrast significant decrease was observed in albumen weight. Neither guar meal levels nor β-mannanase supplementation influenced liver, gizzard, heart and spleen weight percent. All guar meal treatments with or without β-mannanase recorded significantly (P≤ 0.05) lower abdominal fat percent than control treatment. Increasing guar meal than 5% increased significantly (P≤ 0.05) thymus weight percent but supplemented β-mannanase decreased significantly (P≤ 0.05) thymus weight percent. The best relative economic efficiency value recorded for diet that contains 5% guar meal with β-mannanase.

Using Guar Meal or Saponin Extracted From It as Safe Alternatives to Antibiotics in Feeding Laying Hens.

“…In the same manner, guar meal supplementation didn't affect significantly AST and ALT. this result agrees with Youssef and El-Gabry, (2018) who reported that guar meal may not possess an adverse effect on liver function.…”

“…In the present study supplemented diet with 60 ppm and 120 ppm saponin depressed body fat by 26.9% and 32.6 respectively. The insignificant effects of saponin, salinomycin and guar meal on plasma protein profile were reported by ( Yenge, et al, 2018;Kamashi, et al, 2004;Youssef and El-Gabry, 2018) respectively. Concerning numerical increased in total lipid by salinomycin supplementation, the result is in full agreement with (Angelovičová, et al, 2016).…”

“…Increasing saponin levels from 60 ppm to 120 ppm did not lead to significant improvement in egg production percent as same as increasing guar level from 0.3% to 0.6%. Increasing guar meal level in layer diet up to 10% did not cause harmful effect on egg performance (Youssef and El-Gabry, 2018). The harmless effect of increasing guar meal and saponin extracted from guar bean levels may be due to the levels used in the experiment being so low than the harm level (5gm saponin/kg diet) (Whitehead et al, 1981).…”

Effects of dietary guar meal with or without beta-mannanase on performance and egg quality traits in laying hens

“…The effects of guar meal levels on egg yolk index were found to be significant (P < 0.05), while enzyme levels and guar × enzyme interactions did not have any significant effects on yolk index (Table 4). This result is in agreement with the findings of Youssef and Hoda [70].…”