Age and Calcium Sources in Laying Hen Feed Affect Calcium Digestibility

作     者：Thiago Ferreira Diana Arele Arlindo Calderano Fernando de Castro Tavernari Horácio Santiago Rostagno Alexandre de Oliveira Teixeira Luiz Fernando Teixeira Albino Thiago Ferreira Diana;Arele Arlindo Calderano;Fernando de Castro Tavernari;Horácio Santiago Rostagno;Alexandre de Oliveira Teixeira;Luiz Fernando Teixeira Albino

作者机构：Department of Animal Sciences Universidade Federal de Viçosa Viçosa MG Brazil Embrapa Suínos e aves Concórdia SC Brazil Department of Animal Sciences Universidade Federal de São João del-Rei São João del-Rei MG Brazil 

出 版 物：《Open Journal of Animal Sciences》 (动物科学期刊（英文）)

年 卷 期：2021年第11卷第3期

页      面：501-513页

学科分类：081702[工学-化学工艺] 07[理学] 08[工学] 0817[工学-化学工程与技术] 070305[理学-高分子化学与物理] 0703[理学-化学] 

主　　题：Dicalcium Phosphate Digestion Endogenous Calcium Granulometry Limestone 

摘      要：The apparent calcium (Ca) digestibility coefficient (ADC) and true digestibility coefficient (TDC) of different inorganic calcium sources were determined in laying hens of different ages. Three Ca digestibility tests were carried out, each assessing 240 Lohmann Brown lineage laying hens distributed in a completely randomized design. Nine dietary treatments were arranged in a 3 × 3 factorial design consisting of three ages (40, 50 and 70 weeks) × three Ca (dicalcium phosphate (DCP) sources, fine (FL) and coarse (CL)) limestone, comprising eight replicates per treatment of six birds per experimental unit. Regarding the DCP, the ADC was higher (P as 0.889, 0.613 and 0.712, respectively. No effect (P 0.05) of age on the ADC was noted for either FL or CL. Comparing Ca sources, DCP exhibited a higher (P 0.05). Endogenous loss values of 790, 860 and 930 mg·kgsp