Effect of Calcium Sources and Particle Size on Performance and Eggshell Quality in Laying Hens

Abstract

An experiment was conducted to determine the effect of different combination calcium sources and particle size on performance and egg shell quality in layer hens. In the experiment, 198 brown laying hens at 44 week of age were randomly assigned into 11 treatments groups. The experimental diets consisted of different calcium sources (Fine limestone, large limestone, large oyster shell and large egg shell) and their different combination. The experimental unit consisted of a groups of three hens, thus each treatment was replicated six times. Different calcium sources and particle size addition to the laying hens diet had no significantly effect on body weight gain, egg production, egg mass, feed intake, feed conversion ratio, egg specific gravity, egg shell weight, egg shell thickness and egg shell breaking strength but egg weight had significantly affected by the treatments. The significantly highest egg weight was found in laying hens fed with 50 % fine limestone and 50 % large limestone. Dietary different Ca sources had a significant effect on Ca, P and Mg as mineral contents of eggshell and tibia. In the present study, when dietary large calcium sources (limestone, oyster shell and egg shell) had no effect on performance and eggshell quality parameters in laying hens. However, dietary containing at least 50 % large calcium sources had positive effect on mineral contents of tibia.

Free-choice Feeding of Three Different Dietary Calcium Sources and their Influence on Egg Quality Parameters of Commercial Layers

“…In broiler processing, bones are left as a by-product which has a potential to be used as a Ca source. So far, number of studies have been conducted to investigate the effect of limestone (Safaa et al, 2008;Saunders-Blades et al, 2009;Ahmed et al, 2013), oyster shell (Safaa et al, 2008;Saunders-Blades et al, 2009;Ahmed et al, 2013) and egg shells (Olgun et al, 2015;Tunç and Cufadar, 2015) as sources of Ca in layer diets. However, to the author's knowledge, no research has been conducted to investigate the effect of bone meal as an external Ca source on egg shell quality parameters of layers.…”