Paper Information

Title: 

STUDY ON THE EFFECTS AND APPROPRIATE TIME TO FEED OYSTER SHELLS TO BROILER BREEDERS

Type: POSTER
Author(s): MAHJOUR A.A.*
 
 *ISLAMIC AZAD UNEVIRSITY, KAZERRON BRANCH
 
Name of Seminar: IRANIAN CONGRESS OF PHYSIOLOGY AND PHARMACOLOGY
Type of Seminar:  CONGRESS
Sponsor:  PHYSIOLOGY AND PHARMACOLOGY SOCIETY, MASHHAD UNIVERSITY OF MEDICAL SCIENCE
Date:  2007Volume 18
 
 
Abstract: 

Introduction: Hens do not eat during the period of darkness. This time is the most active period of shell deposition. Bone is reabsorbed during the night to provide Ca for shell formation. The demand for Ca2+ during shell formation reduces the concentration of Ca2 in blood plasma.
Methods: Forty 28-week old broiler breeders were divided in 4 equal groups. Group one was feeded with routine diet with. The other three groups received 5 gram oyster shell per hen at 9am, 2pm and 5pm respectively. Concentration of calcium in blood plasma was measured each 6 hour. A necropsy study was conducted on all of the birds. 5µm slides were provided from femur bone of all of the birds. Thickness of the trabecules of the bones was measured using an eye devise.
Results: Group 1 showed high concentration of Ca after feeding (220 µg ml -1) and a low concentration of Ca in blood at night (90 µg ml -1). Group two showed approximately same figures. In group three the Ca concentration in blood was 195 µg ml -1 at 8 pm, 160 µg ml -1 at 2am, 190 at 11pm and 215 µg ml-1 in 8am and 212 µg ml -1 in 2pm. Group four showed a lower concentration of blood Ca2+ at 11pm(170 µg ml -1) and 6am (110 µg ml -1), but had a higher concentration of calcium in 11 am (220 µg ml -1) and 5pm (190 µg ml -1). In histopathology inspection the bone trabeculae of group 4 was reasonably Ticker than other groups.
Conclusion: Our study demonstrated that the bone reabsorption can be minimized by feeding Ca2+ as particles that can be seen and picked out by hens. It seems that the best time to provide this additional supply of calcium is in afternoon before the darkness period.

 
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