Age and Calcium Sources in Laying Hen Feed Affect Calcium Digestibility

动物科学期刊(英文) Pub Date : 2021-06-04 DOI:10.4236/ojas.2021.113034

T. F. Diana, A. A. Calderano, F. Tavernari, H. Rostagno, A. D. O. Teixeira, L. Albino

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引用次数: 3

Abstract

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·kg-1 of consumed dry matter were observed at 40, 50 and 70 weeks, respectively. For the TDC, no interaction (P > 0.05) was observed between Ca sources and bird age. The highest TDC value (P > 0.05) was found in birds fed DCP (0.786) followed by FL (0.637) and CL (0.534). In addition, birds at 40 weeks of age (0.714) exhibited higher TDC values (P

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蛋鸡饲料中钙源和年龄对钙消化率的影响

测定了不同无机钙源对不同年龄蛋鸡的表观钙消化率（ADC）和真消化率（TDC）。进行了三项Ca消化率测试，每项测试以完全随机设计的方式评估240只Lohmann-Brown系蛋鸡。9个日粮处理采用3×3因子设计，由3个年龄（40、50和70周）×3个Ca（磷酸氢钙（DCP）来源、细（FL）和粗（CL））石灰石组成，每个处理8个重复，每个实验单元6只鸟。关于DCP，ADC更高（P分别为0.889、0.613和0.712）。FL和CL的年龄对ADC没有影响（P>0.05）。比较Ca来源，DCP表现出更高（P<0.05）。在40、50和70周时，消耗干物质的内源性损失值分别为790、860和930 mg·kg-1。对于TDC，Ca来源与鸟龄之间没有相互作用（P>0.05）。喂食DCP（0.786）的鸟类TDC值最高（P>0.05），其次是FL（0.637）和CL（0.534）。此外，40周龄的鸟类（0.714）TDC值较高（P

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动物科学期刊(英文)

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