Effect of super dosing of phytase on growth performance, ileal digestibility and bone characteristics in broilers fed corn-soya-based diets.
A feeding trial was designed to assess the effect of super dosing of phytase in corn-soya-based diets of broiler chicken. One hundred and sixty-eight day-old broilers were selected and randomly allocated to four dietary treatment groups, with 6 replicates having 7 chicks per treatment group. Two-phased diets were used. The starter and finisher diet was fed from 0 to 3 weeks and 4 to 5 weeks of age respectively. The dietary treatments were consisted of normal phosphorus (NP) group without any phytase enzyme (4.5 g/kg available/non-phytin phosphorus (P) during starter and 4.0 g/kg during finisher phase), three low-phosphorus (LP) groups (3.2 g/kg available/non-phytin P during starter and 2.8 g/kg during finisher phase) supplemented with phytase at 500, 2500, 5000 FTU/kg diet, respectively, to full fill their phosphorus requirements. The results showed that super doses of phytase (at 2500 FTU and 5000 FTU/kg) on low-phosphorus diet improved feed intake, body weight gain, ileal digestibility (serine, aspartic acid, calcium, phosphorus), blood P levels and bone minerals such as calcium (Ca), P, magnesium (Mg) and zinc (Zn) content. It could be concluded that super doses of phytase in low-phosphorus diet were beneficial than the normal standard dose (at 500 FTU/kg) of phytase in diet of broiler chicken.
National Institute of Animal Nutrition and Physiology, Bangalore, India.
M
M
Manobhavan
National Institute of Animal Nutrition and Physiology, Bangalore, India.
A V
AV
Elangovan
National Institute of Animal Nutrition and Physiology, Bangalore, India.
M
M
Sridhar
National Institute of Animal Nutrition and Physiology, Bangalore, India.
D
D
Shet
National Institute of Animal Nutrition and Physiology, Bangalore, India.
S
S
Ajith
National Institute of Animal Nutrition and Physiology, Bangalore, India.
D T
DT
Pal
National Institute of Animal Nutrition and Physiology, Bangalore, India.
N K S
NK
Gowda
D010832:6-Phytase / Q000008:administration & dosage / Q000494:pharmacology*; D000821:Animal Feed / Q000032:analysis*; D000824:Animal Nutritional Physiological Phenomena; D000818:Animals; D015519:Bone Density / Q000187:drug effects*; D002136:Calcium, Dietary / Q000008:administration & dosage / Q000378:metabolism; D002645:Chickens / Q000254:growth & development* / Q000502:physiology; D004032:Diet / Q000662:veterinary; D004305:Dose-Response Relationship, Drug; D005260:Female; D008297:Male; D016226:Phosphorus, Dietary / Q000008:administration & dosage / Q000378:metabolism; D013025:Glycine max / Q000737:chemistry*; D003313:Zea mays / Q000737:chemistry*
D002136:Calcium, Dietary; D016226:Phosphorus, Dietary; D010832:6-Phytase
bone; broiler; nutrient utilization; phosphorus; phytase