In the second cycle of laying hens, egg production and quality decrease. This is mainly due to decreased absorption of calcium from the gastrointestinal tract. Hence, serum concentrations of calcium tend to decrease and are compensated through bone reabsorption. There are several sources of calcium with different solubilities and absorption rates. The choice of one of them may be of importance for the referred second laying-cycle in hens. Hence, relative F (Fr) of four sources of Ca were evaluated in 300 Bovans-White 85-week-old hens. Animals were randomly assigned to five groups as follows: control-group receiving base-line doses of calcium carbonate as required by this hens' linage (GC); GCca-group which received additional calcium carbonate; GFtc-group dosed with tricalcium phosphate; GLgc-group which received calcium lactate-gluconate, and GCcaCp-group which received calcium carbonate plus 10 μg of capsicum oleoresin (COr). Each hen was orally dosed with 1 g of Ca-equivalent by probe, and serum Ca was quantified at predetermined times. Ca-kinetic behavior was characterized by calculating: maximum serum concentration (C_MAX); time to achieve C_MAX (T_MAX); area under the concentration curve vs. time (AUC_0-24). Fr as compared to GCca were calculated. GLgc and GCcaCp had the greatest C_MAX and Fr values i.e., 34.7 and 37.2 μg/dL for C_MAX and 109.6 and 112.9 % for F_R, respectively, and they were statistically indistinguishable between them (P< 0.05). GCca showed lower AUC and C_MAX than former groups, but greater than GC (P < 0.05). Capsicum oleoresin is postulated as a promoter of Ca bioavailability in hens during the second cycle of egg-production. A dose-response relationship of COr is required to determine the optimum dose of COr to enhance Ca bioavailability.

在下蛋鸡的第二个周期中，产蛋量和质量下降。这主要是由于胃肠道对钙的吸收减少。因此，血清钙的浓度趋于降低，并通过骨重吸收得到补偿。钙的几种来源具有不同的溶解度和吸收率。其中之一的选择对于母鸡的第二产蛋周期可能很重要。因此，在300头Bovans-White 85周龄母鸡中评估了四种Ca来源的相对F（Fr）。将动物随机分为五组，如下：对照组按照母鸡的线性（GC）的要求接受基线剂量的碳酸钙；GCca-基团获得了额外的碳酸钙；GFtc-组给予磷酸三钙；接受乳酸葡萄糖酸钙的GLgc组，GCcaCp-group接受碳酸钙加10μg辣椒油树脂（COr）。通过探针给每只母鸡口服1g钙当量，并在预定时间定量血清钙。Ca动力学行为的特征在于计算：最大血清浓度（C_MAX）; 达到C _MAX（T _MAX）的时间；浓度曲线下的面积与时间的关系（AUC _0-24）。计算与GCca相比的Fr。GLgc和GCcaCp具有最大Ç _MAX和FR值，即，34.7和37.2微克/分升对于C _MAX和109.6和与F 112.9％_R，分别与它们在它们之间难以区分统计学（P <0.05）。GCca的AUC和C _MAX低于前一组，但高于GC（P <0.05）。辣椒油树脂被认为是产蛋第二个周期中母鸡钙生物利用度的促进剂。需要COr的剂量反应关系来确定提高Ca生物利用度的最佳COr剂量。