@misc{10481/74659,
year = {2022},
month = {4},
url = {http://hdl.handle.net/10481/74659},
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.},
organization = {Instituto de Salud Carlos III
Spanish Government	CGL2015-64683-P},
publisher = {Taylor & Francis},
keywords = {Laying hen},
keywords = {Laying performance},
keywords = {Keel bone},
keywords = {Fracture},
keywords = {Deviation},
keywords = {Breaking strength},
keywords = {Osteoporosis},
keywords = {Bone quality},
title = {Bone quality and composition are influenced by egg production, layer line, and oestradiol-17ß in laying hens},
doi = {10.1080/03079457.2022.2050671},
author = {Eusemann, Beryl Katharina and Sánchez Rodríguez, Estefanía and Benavides Reyes, Cristina and Domínguez Gasca, Nazaret and Rodríguez Navarro, Alejandro},
}