The present study was conducted to evaluate the effect of two Zn supplemented levels and two Zn and Cu sources (sulphate and hydroxychloride) on growing‐finishing pigs. An in vitro study and an in vivo study were conducted. In the in vitro study, Zn solubility from each source at different Zn supplementation levels was evaluated, as well as the phytic phosphorus (PP) solubility derived from the interaction or not with phytic acid at similar conditions to those found in digestive tract. The most critical interaction of Zn with phytic acid was at pH 6.5 and with Zn sulphate, resulting in the reduction in PP solubility. In the in vivo experiment, a total of 444 pigs ([Duroc × Landrace]×Pietrain; initial BW: 18.7 ± 0.20 kg) were allotted to 36 pens in a randomized complete block design (2 × 2) factorial arrangement with two Zn and Cu sources and two Zn supplemental levels (20 and 80 mg/kg). The Cu supplementation was fixed at 15 mg/kg for all diets. There was no effect of the interaction between mineral source × Zn level or Zn level on growth performance or carcass characteristics (p > .10). Apparent total digestibility of Zn and Cu along with carcass yield was higher for pigs fed hydroxychloride than pigs fed the sulphate counterparts (p < .05). Feeding low levels of Zn decreased Zn (45.5%; p < .0001) and Cu(18.5%; p = .018) faecal excretion. In conclusion, under commercial conditions, feeding growing‐finishing pigs with Zn levels below those established by the European Union regulation did not affect growth performance and carcass characteristics. Reducing dietary mineral (Zn and Cu) diet content resulted in a lower faecal mineral excretion. Pigs fed sulphate minerals had an improved performance during grower period, while pigs fed hydroxychloride minerals showed an improved performance during finishing period and a greater carcass yield and mineral digestibility than those fed sulphates.

中文翻译：

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两种补锌水平和两种不同溶解度特性的锌源和铜源对生长肥育猪生长性能、胴体特性和消化率的影响。

本研究旨在评估两种锌补充水平以及两种锌和铜源（硫酸盐和羟基氯化物）对生长肥育猪的影响。进行了体外研究和体内研究。在体外研究中，评估了不同锌补充水平下每种来源的锌溶解度，以及在与消化道中相似条件下与植酸相互作用或不相互作用所产生的植磷（PP）溶解度。锌与植酸最关键的相互作用发生在 pH 6.5 以及与硫酸锌的相互作用，导致 PP 溶解度降低。在体内实验中，总共 444 头猪（[杜洛克 × 长白]×皮特兰；初始体重：18.7 ± 0.20 kg）被分配到 36 个栏内，采用随机完全区组设计（2 × 2）阶乘排列，其中有两个 Zn 和铜来源和两种锌补充水平（20 和 80 毫克/千克）。所有日粮的铜补充量固定为 15 毫克/千克。矿物源 × 锌含量或锌含量之间的相互作用对生长性能或胴体特性没有影响 ( p  > .10)。饲喂羟基氯化物的猪的锌和铜的表观总消化率以及胴体产量高于饲喂硫酸盐的猪 ( p  < .05)。饲喂低水平的锌会减少粪便中锌 (45.5%; p < .0001) 和铜 (18.5%; p  = .018) 的排泄。总之，在商业条件下，饲喂生长肥育猪的锌含量低于欧盟规定的水平不会影响生长性能和胴体特性。减少膳食矿物质（锌和铜）含量会导致粪便矿物质排泄减少。饲喂硫酸盐矿物质的猪在生长期表现出改善的性能，而饲喂羟基氯化物矿物质的猪在育肥期表现出改善的性能，并且比饲喂硫酸盐的猪具有更高的胴体产量和矿物质消化率。