Performance, bone mineralization and carcass characteristics of broilers fed low phosphorus diets supplemented with phytase [electronic resouce].
الاداء الإنتاجي المحتوى المعدني للعظام وصفات الذبيحة لكتاكيت اللحم المغذاة علي علائق منخفضة من الفسفور والمضاف اليها انزيم الفيتيز.
- p.669- 688.
Includes references.
Broiler growth experiment was conducted to further study the effect of dietary nonphytate-P (NPP) level and phytase supplementation on performance, bone mineralization and carcass characteristics. Four diets were formulated to contain 0.14, 0.25, 0.35 and 0.45% NPP for feeding from 1 to 21 days of age, and 0.13, 0.20, 0.30 and 0.35% NPP for feeding from 21 to 35 days of age, correspondingly. Phytase enzyme was added to all diets at two levels being, 0 and 500 U/Kg. Every dietary treatment was fed to 3 replicates (12 chicks each) of one day old Ross broiler chicks for 35 days experimental period. The results showed that weight gain and feed intake increased with increasing level of dietary NPP. Also feed conversion ratio significantly (P<0.001) improved with increasing dietary NPP level. Addition of phytase improved body weight, feed intake and feed / gain equal to that occurred when the dietary NPP increased by 0.1%. Length of tibia and weights of tibia and toe significantly (P<0.001) increased with increasing of dietary NPP level. The addition of phytase enzyme increased (P<0.01) length of tibia and improved weights of tibia (P>0.05) and toe (P>0.05). Phytase supplementation significantly (P<0.001) increased ash percentages in tibia and toe and increased concentration of P%, Ca % and Zn (mg/kg) in tibia bone ash. Dressing percentage, liver, heart and gizzard (% of body weight) were significantly (P<0.05) affected as dietary NPP increased, while addition of phytase enzyme had no significant effect. It could be concluded that the addition of 500 U phytase/Kg to cornsoybean meal broiler diets containing low levels of NPP improved growth performance, bone mineralization and carcass characteristics.
Summary in Arabic.
Broiler (Chickens)--Feeding and feeds. Phytases. Phosphorus in animal nutrition.