The aim of the present study was to evaluate the effect of a humic acid (HA)‐supplemented diet on productive performance and some physiological parameters of growing rabbits. A total of 80 weaned V‐line rabbits at an age of 4 weeks were randomly divided into four groups. Rabbits of groups 2, 3 and 4 were fed diet containing 35 (HA35), 70 (HA70) and 105 (HA105) mg Humic acid/kg diet while the first group served as control (HA0). Body weight gain was positively affected by HA treatment. HA105 rabbits had the improved feed conversion value. HA treatments had significantly reduced plasma cholesterol concentration and significant increased red blood cells, white blood cells count and plasma high‐density lipoprotein concentrations. However, serum aspartate amino transferase and alanine amino transferase activities, creatinine and the apparent nutrients digestibility values were not affected by HA treatments. Organic matter digestibility of all HA‐treated groups significantly increased compared with HA0. At 63 days of age (after 35 days of treatment), caecum microbial counts decreased (total bacteria and Escherichia coli) with HA treatments. Generally HA could be considered as a biological as growth promoter feed additive alternative to antibiotics.

中文翻译：

---

用腐殖酸处理的生长中兔子的生产性能，脂质分布和盲肠微生物计数。

本研究的目的是评估补充腐殖酸（HA）的饮食对生长中兔子的生产性能和某些生理参数的影响。总共80只4周龄的断奶V型兔被随机分为四组。第2、3和4组的兔子饲喂含35（HA35），70（HA70）和105（HA105）腐殖酸/ kg饲料的日粮，而第一组作为对照组（HA0）。体重增加受到HA治疗的积极影响。HA105兔的饲料转化价值得到改善。HA治疗可显着降低血浆胆固醇浓度，并显着增加红细胞，白细胞计数和血浆高密度脂蛋白浓度。但是，血清天冬氨酸氨基转移酶和丙氨酸氨基转移酶的活性，肌酐和表观养分消化率值不受HA处理的影响。与HA0相比，所有经过HA处理的组的有机物消化率均显着提高。在63天大的年龄（治疗35天后），盲肠微生物的数量减少了（细菌总数和大肠杆菌（HA）处理。通常，HA可以被认为是抗生素的生物替代生长促进剂饲料添加剂。