17th International Symposium on Boron, Borides and Related Materials, İstanbul, Türkiye, 13 - 15 Mayıs 2010, cilt.1, sa.1, ss.325
The objective of this experiment was to determine the effect of various boron sources on biomechanical traits of tibia in two commercial strains of laying hens during phase 2 (from 105 to 112). A 56- day experiment was conducted in a 2x5 (10 combinations or treatments) factorial arrangement of 2 strains (Lohmann-LSL and Iso Brown) and 5 treatments (basal corn-soybean meal diet-control, or the basal diet supplemented with 150 mg boron/kg from boric acid (H3BO3), borax penta hydrate (Na2B4O7.5H2O), borax deca hydrate (Na2B4O7.10H2O) and sodium perborat tetra hydrate (NaBO2H2O2.3H2O). Each combination was made up of 6 replicates, each of which had 4 hens in a cage. Four different parameters (bone exterior diameter, ultimate shear force, shear stress and shear fracture energy), describing the fracture mechanics of tibia, were investigated.
Strain had a significant effect on all the measured parameters. In the Lohmann-LSL hens, these parameters except for the exterior diameter were significantly higher than in the Iso Brown hens. In Iso Brown strain, the exterior diameter was significantly higher compared with Lohmann-LSL. There were significant interactions between strain and diet for exterior diameter and ultimate shear stress. In the Lohmann-LSL hens, no treatment significantly affected these bone traits. The exterior diameter of Iso Brown fed borax decahydrate was significantly lower (P<0,05) than that of basal diet, basal diet with borax pentahydrate and Lohmann-LSL. Shear stress of Iso Brown fed diet with borax decahydrate was significantly lower than that of all the other groups except for control group. These results show that the effect of boron may vary according to strain and/or boron sources.