Abstract:

The experiments were conducted with different domestic animals （pigs, broilers and laying hens） fed the diets supplemented with different levels of agricultural-use nitric acid lanthanide. The objective of the study was to find whether lanthanide elements had any effect on productive performance and product quality of the animals. The results showed that the rare earth elements as feed additive improved growth and egg production, reduced feed consumption, and increased feed efficiency in those domestic animals. Optimal supplemental level of the rare earth elements for different animal species was also found. It was demonstrated that the use of the lower level of lanthanide as feed additives to the diet of the domestic animals has no side effects on livability of young animals as well as quality of eggs products. Since the use of antibiotics as growth promoters in animal feed has been restricted in many countries, the study indicates the possibility of using rare earth elements as safe and inexpensive alternative performance enhancers for pigs, broilers and laying hens.

Key words: rare earth elements , pigs , broilers ;laying hens , production performance

摘要：

通过将农用硝酸稀土以不同的浓度分别添加到不同种类、不同用途畜禽（肉猪、肉鸡和蛋鸡）日粮中进行饲养试验，研究测定稀土对其生产性能、动物血液生化指标和产品品质的影响，通过大量试验证明畜禽日粮中添加适量稀土可以有效促进畜禽生长，提高产肉、产奶、产蛋能力，降低饲料消耗，提高饲养效益，给出了不同畜禽的适宜添加量。。试验同时证明畜禽日粮中添加适量稀土对幼畜（禽）成活率、鸡蛋质量等无不良影响。目前许多国家动物饲养中限制使用抗生素，可以考虑稀土作为家畜安全、廉价的饲料 添加荆用于动物生产。

关键词: 稀土 育肥猪 产蛋鸡 肉鸡 生产性能