Dietary zinc supplementation affects eggshell quality and ultrastructure in commercial laying ducks by influencing calcium metabolism.
Dietary zinc supplementation affects eggshell quality and ultrastructure in commercial laying ducks by influencing calcium metabolism.
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日粮补锌通过影响钙代谢来影响商品蛋鸭的蛋壳质量和超微结构
DOI：
10.1016/j.psj.2021.101539
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发表时间：
2022-01
期刊：
影响因子：
4.4
通讯作者：
Chen W
中科院分区：
文献类型：
--
作者：
Zhang Y;Deng Y;Jin Y;Zhuang Z;Huang X;Li K;Wang S;Xia W;Ruan D;Wang S;Zheng C;Chen W
本试验研究了日粮补锌对蛋鸭生产性能、蛋壳品质和超微结构以及蛋壳形成过程中钙代谢的影响。选用360只45周龄的龙眼蛋鸭，随机分为5个处理组，每组6个重复，每个重复12只，饲喂20wk。6个处理组在基础日粮中添加0(对照)、20、40、80或160 mg/kg锌(锌·水)。与基础日粮相比，80 mg/kg的日粮添加水平提高了蛋鸡的产蛋量(4.3%)和蛋重(5.7%)，降低了饲料系数(2.9%)，且这些指标随锌添加水平的提高呈二次曲线上升(P<；0.05)。添加锌80 mg/kg组断壳强度(15.8%)和断裂韧性(10.6%)均高于基础日粮，且呈二次曲线关系(P<；0.05)。日粮中添加80 mg/kg锌可提高蛋壳总厚度(9.0%)和有效厚度(14.2%)，降低乳头体厚度(12.0%)，改善蛋壳超微结构，且随锌水平的提高呈二次曲线关系(P<；0.05)。补锌对仔猪血浆、胫骨、尺骨中钙含量、尺骨磷含量均有显著影响，且呈直线和二次效应，160 mg/kg组显著高于对照组(P<；0.05)。锌水平为80 mg/kg时，蛋壳有效厚度增加(P<；0.05)，蛋壳钙磷含量增加(P<；0.05)。日粮补锌对蛋壳腺钙离子转运蛋白基因表达无明显影响，但对蛋壳转运蛋白−交换器基因表达有影响(P<；0.05)。综上所述，日粮补锌可以改善产蛋后期蛋鸭的生产性能和蛋壳品质，锌通过调节蛋鸭体内钙的代谢和沉积，影响−的分泌，进而影响蛋壳的超微结构和品质。基础锌水平为34.0 mg/kg的日粮中添加80 mg/kg的锌效果最好，较高的锌水平(160 mg/kg)可抑制蛋壳钙的代谢，从而降低蛋壳钙的沉积。
This study evaluated dietary Zn supplementation on productive performance, eggshell quality and ultrastructure, and calcium metabolism during eggshell formation in laying ducks. A total of 360 Longyan laying ducks (45-wk) were randomly divided into 5 treatment groups with 6 replicates of 12 birds each and fed for 20 wk. The 6 treatments fed the basal diet supplemented with 0 (control), 20, 40, 80, or 160 mg Zn/kg (ZnSO4·H2O). Dietary supplemental level at 80 mg/kg increased egg production (4.3%) and mass (5.7%), and decreased FCR (2.9%) compared to the basal diet, and these indices increased quadratically with increasing Zn supplemental levels (P < 0.05). The shell breaking strength (15.8%) and fracture toughness (10.6%) were higher with the supplementation of Zn at 80 mg/kg than the basal diet, and increased quadratically with Zn supplementation (P < 0.05). Dietary supplementation of Zn at 80 mg/kg improved shell ultrastructure by increasing total (9.0%) and effective thickness (14.2%) and decreasing mammillary thickness (12.0%), and their responses were quadratic with increasing Zn levels (P < 0.05). The supplementation of Zn affected the calcium contents in plasma, tibias and ulna, ulna phosphorus content, and linear and quadratic effects were observed, and higher values were observed with 160 mg/kg Zn supplementation than control (P < 0.05). The supplemental Zn level at 80 mg/kg increased shell effective thickness in growth stage (P < 0.05), and shell calcium and phosphorus content in initial and growth stages (P < 0.05). Dietary Zn supplementation did not affect the gene expression of Ca2+ transporters in the eggshell gland, but affected the expression of HCO3− exchanger in initial and growth stage (P < 0.05). Overall, dietary Zn supplementation could improve productive performance and shell quality in laying ducks at late phase of production, and calcium metabolism and deposition were modulated by Zn influencing HCO3− secretion and thus affecting shell ultrastructure and quality. A supplemental level of 80 mg/kg Zn in the diet with a basal content of 34.0 mg/kg was optimal, and higher level (160 mg/kg) decreased shell calcium deposition by depressing its metabolism.
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影响因子：
4.4
作者：
Brionne A;Nys Y;Hennequet-Antier C;Gautron J
通讯作者：
Gautron J
影响因子：
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作者：
Fernandez, MS;Moya, A;Arias, JL
通讯作者：
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影响因子：
4.4
作者：
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通讯作者：
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影响因子：
2.7
作者：
Abd El-Hack, M. E.;Alagawany, M.;El-Kholy, M. S.
通讯作者：
El-Kholy, M. S.
影响因子：
4.4
作者：
Bello A;Dersjant-Li Y;Korver DR
通讯作者：
Korver DR