AI Article Synopsis
- Keel bone fractures in laying hens present a significant welfare issue, leading researchers to investigate factors like egg production, oestradiol-17ß, and genetic selection on bone health.
- Two layer lines with different egg production rates (320 eggs for WLA and 200 for G11) were studied, along with four treatment groups that received various hormone implants to assess their impact on bone quality.
- Findings showed non-egg-laying hens had better bone quality than egg-layers, and differences in bone composition between layer lines suggest genetic factors influence susceptibility to fractures, with varying effects from hormone treatment on bone health.
Article Abstract
Keel bone fractures are a serious animal welfare problem in laying hens. The aim of the current study was to assess the influence of egg production, oestradiol-17ß, and selection for high laying performance on bone quality. Hens of two layer lines differing in laying performance (WLA: 320 eggs per year, G11: 200 eggs per year) were allocated to four treatment groups. Group S received a deslorelin acetate implant that suppressed egg production. Group E received an implant with the sexual steroid oestradiol-17ß. Group SE received both implants and group C did not receive any implant. In the 63rd week of age, composition and characteristics of the tibiotarsi were assessed using histological analysis, three-point bending test, thermogravimetric analysis, infrared spectroscopy, and two-dimensional X-ray diffraction, respectively. Non-egg-laying hens showed a higher total bone area and a higher relative amount of cortical bone compared to egg-laying hens. Hens of layer line G11 showed a higher relative amount of medullary bone and a higher degree of mineralization of the cortical bone compared to hens of layer line WLA. These differences in bone composition may explain different susceptibility to keel bone fractures in non-egg-laying compared to egg-laying hens as well as in hens of layer lines differing in laying performance. The effect of exogenous oestradiol-17ß on bone parameters varied between the layer lines indicating a genetic influence on bone physiology and the way it can be modulated by hormone substitution.
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| http://dx.doi.org/10.1080/03079457.2022.2050671 | DOI Listing |
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