Ansari I, Khalaji S, Hedayati M
Department of Animal Science, Faculty of Agricultural Sciences, Malayer University, Malayer, 65719-95863, Iran.
Trop Anim Health Prod. 2020 Mar;52(2):591-600. doi: 10.1007/s11250-019-02046-2. Epub 2019 Aug 24.
Potassium phosphate (KHPO) and potassium carbonate (KCO) administration by feed or water were evaluated on broiler performance, bone strength, alkaline phosphatase activity (ALP), and phosphorus digestibility under heat stress and high chloride condition. Experimental groups include control; 15 cc/kg KHPO; 30 cc/kg KHPO; 15 cc/l KHPO; and 3.7 g/kg KCO. Body weight (BW), feed and water consumption, plasma potassium, phosphorus, and calcium concentration along with plasma and digestive ALP and intestinal digesta pH were measured during the trial. Tibia ash, calcium and phosphorus content, and breaking strength were measured on days 21 and 42 and phosphorus digestibility on day 36 of age. As a result of this, study feed and water consumption was increased by supplementation of the feed or water with KHPO (P ≤ 0.001). KHPO increased body weight at 42 days of age (P ≤ 0.001). Tibia ash and phosphorus content was increased by KHPO supplementation (P ≤ 0.004; P ≤ 0.003). KCO did increased tibia ash but not changed tibia phosphorus content significantly. Tibia shear force, shear energy, extension, and length were improved by KHPO administration at 42 days of age (P ≤ 0.001). Administration of either feed or water with KHPO increased plasma potassium, phosphorus, and calcium concentration at 21 days of age, whereas KCO reduced plasma potassium at 21 days of age (P ≤ 0.05). Plasma ALP reduced by addition of 15 cc KHPO and KCO to diets at 42 days of age, whereas digestive ALP was increased by inclusion of KHPO and not by KCO. Supplementation of either feed or water with KHPO increased phosphorus digestibility, whereas KCO reduced phosphorus digestibility (P ≤ 0.003). Jejunum and ileum pH was reduced by KHPO or by KCO at 21 and 42 days of age (P ≤ 0.006; (P ≤ 0.05). Over all, results of current study revealed that KHPO can be a suitable potassium salt choice instead of KCL in hot weather conditions especially when the water or diet contains high levels of chloride.
通过饲料或饮水给予磷酸钾（KHPO）和碳酸钾（KCO），在热应激和高氯条件下评估其对肉鸡生产性能、骨骼强度、碱性磷酸酶活性（ALP）和磷消化率的影响。实验组包括对照组；15毫升/千克磷酸钾；30毫升/千克磷酸钾；15毫升/升磷酸钾；以及3.7克/千克碳酸钾。在试验期间测量体重（BW）、饲料和水消耗量、血浆钾、磷和钙浓度，以及血浆和消化液中的ALP和肠道食糜pH值。在21日龄和42日龄时测量胫骨灰分、钙和磷含量以及抗折断强度，并在36日龄时测量磷消化率。结果表明，通过在饲料或饮水中添加磷酸钾，饲料和水的消耗量增加（P≤0.001）。磷酸钾增加了42日龄时的体重（P≤0.001）。添加磷酸钾可提高胫骨灰分和磷含量（P≤0.004；P≤0.003）。碳酸钾确实增加了胫骨灰分，但未显著改变胫骨磷含量。42日龄时给予磷酸钾可改善胫骨剪切力、剪切能量、伸长率和长度（P≤0.001）。在21日龄时，通过饲料或饮水给予磷酸钾可提高血浆钾、磷和钙浓度，而碳酸钾在21日龄时降低了血浆钾（P≤0.05）。在42日龄时，向日粮中添加15毫升磷酸钾和碳酸钾可降低血浆ALP，而添加磷酸钾可提高消化液中的ALP，添加碳酸钾则无此效果。通过饲料或饮水添加磷酸钾可提高磷消化率，而碳酸钾则降低磷消化率（P≤0.003）。在21日龄和42日龄时，磷酸钾或碳酸钾可降低空肠和回肠的pH值（P≤0.006；P≤0.05）。总体而言，当前研究结果表明，在炎热天气条件下，尤其是当水或日粮中氯含量较高时，磷酸钾可能是比氯化钾更合适的钾盐选择。
