Chowdhury Rakhi, Rahman Md Aliar, Islam Khan Md Shaiful, Al-Mamun Mohammad
Department of Animal Nutrition, Faculty of Animal Husbandry, Bangladesh Agricultural University, Mymensingh, Bangladesh.
J Adv Vet Anim Res. 2024 Jun 9;11(2):376-383. doi: 10.5455/javar.2024.k786. eCollection 2024 Jun.
Current research aimed to compare the effects of fungal and bacterial phytase with or without citric acid (CA) on growth performance, serum mineral profile, bone quality, and nutrient retention in birds given non-phytate phosphorus (nPP)-deficient diets.
A total of 216 Indian River broiler chicks were disturbed into six groups, namely, i) positive control (PC), ii) negative control (NC) contained 0.2% lower nPP than that in the PC diet, iii) NC + fungal phytase (), iv) NC + fungal phytase with 2% CA, v) NC + bacterial phytase (), and vi) NC + bacterial phytase with 2% CA.
Compared to the PC group, the NC group showed poor performance, serum phosphorus (P) content, P retention, and bone quality. However, with the inclusion of phytase, all these phenomena were improved. The addition of bacterial phytase showed better values compared with fungal phytase. The main effects of phytase were significant for the feed conversion ratio (FCR), metabolizable energy conversion ratio (MECR), and P retention. The addition of CA, either with fungal or bacterial phytases, did not show considerable beneficial effects on overall performances. However, the main effects of CA were significant on the FCR, MECR, and crude protein conversion ratio.
Incorporating bacterial and fungal phytase into low-nPP diets enhanced the broiler's performance. The effects of bacterial phytase were more apparent than those of fungal phytase. However, the efficacy of phytase based on the source might relate to dose, and other factors need further investigation.
当前研究旨在比较添加或不添加柠檬酸（CA）的真菌和细菌植酸酶对饲喂非植酸磷（nPP）缺乏日粮的禽类生长性能、血清矿物质状况、骨骼质量和养分保留率的影响。
总共216只印第安河肉鸡雏鸡被分为六组，即：i）阳性对照（PC），ii）阴性对照（NC），其nPP含量比PC日粮低0.2%，iii）NC + 真菌植酸酶（），iv）NC + 含2% CA的真菌植酸酶，v）NC + 细菌植酸酶（），以及vi）NC + 含2% CA的细菌植酸酶。
与PC组相比，NC组表现出较差的性能、血清磷（P）含量、P保留率和骨骼质量。然而，添加植酸酶后，所有这些现象都得到了改善。与真菌植酸酶相比，添加细菌植酸酶显示出更好的值。植酸酶对饲料转化率（FCR）、代谢能转化率（MECR）和P保留率的主要影响显著。添加CA，无论是与真菌还是细菌植酸酶一起添加，对整体性能均未显示出显著的有益影响。然而，CA对FCR、MECR和粗蛋白转化率的主要影响显著。
在低nPP日粮中添加细菌和真菌植酸酶可提高肉鸡的性能。细菌植酸酶的效果比真菌植酸酶更明显。然而，基于来源的植酸酶功效可能与剂量有关，其他因素需要进一步研究。
