Esteve-Garcia Enric, Perez-Vendrell Anna M, Broz Jiri
Department of Animal Nutrition, Institut de Recerca i Tecnologia Agroalimentàries (IRTA), Reus, Spain.
Arch Anim Nutr. 2005 Feb;59(1):53-9. doi: 10.1080/17450390512331342386.
An experiment was conducted to determine the efficacy of a so-called consensus phytase preparation produced by Hansenula polymorpha on growth, tibia and toe ash and P retention of young turkeys. A total of 192 female turkeys (BUT 9 strain) were placed into 96 batteries at two per cage and assigned to one of eight diets: A negative control containing 2.5 g non-phytate P per kg feed (T-1); T-1 plus 125, 250, 500, 1000 or 10 000 phytase units (U) per kg feed, respectively, (T-2 to T-6); T-1 plus 0.5 or 1.0 g Pi/kg feed as dicalcium phosphate dihydrate (DCP), respectively, (T-7 and 8). The experiment lasted 32 d, and excreta were collected and weighed between 26 and 29 d of age. Feed was also weighed during this period in order to calculate P retention. Performance was calculated for the 0 to 32 d period. At the end of the experiment one bird per pen was killed for tibia and toe ash content determination, except for T-2, T-3, and T-7. Body weight, FCR, toe and tibia ash, and P retention responded to phytase or Pi supplementation. Using linear or quadratic models for comparing performance of the treatments containing supplemental Pi with phytase treatments, an equivalence between phytase and Pi was calculated. Body weight, toe ash, tibia ash and P retention showed a significant response to phytase supplementation. The values of equivalence for body weight, toe ash, tibia ash and P retention were 251, 597, 391 and 390 U to 1 g Pi/kg feed. At 10 000 U/kg feed there was a significant response in terms of weight gain and P retention, indicating that turkeys respond to levels greater than 1 000 U/kg feed.
进行了一项实验，以确定多形汉逊酵母生产的一种所谓的共识植酸酶制剂对幼火鸡生长、胫骨和脚趾骨灰分以及磷保留率的功效。总共192只雌性火鸡（BUT 9品系）被放入96个饲养笼中，每个笼子两只，并分配到八种日粮之一：每千克饲料含2.5克非植酸磷的阴性对照日粮（T-1）；T-1分别添加每千克饲料125、250、500、1000或10000植酸酶单位（U）（T-2至T-6）；T-1分别添加每千克饲料0.5克或1.0克磷酸二氢钙（DCP）作为磷源（T-7和T-8）。实验持续32天，在26至29日龄期间收集并称重排泄物。在此期间也对饲料进行称重，以便计算磷保留率。计算0至32天期间的生产性能。实验结束时，除T-2、T-3和T-7组外，每个饲养笼处死一只火鸡用于测定胫骨和脚趾骨灰分含量。体重、饲料转化率、脚趾和胫骨骨灰分以及磷保留率对植酸酶或磷添加有反应。使用线性或二次模型比较含补充磷的日粮与植酸酶日粮的生产性能，计算出植酸酶与磷的等效值。体重、脚趾骨灰分、胫骨骨灰分和磷保留率对添加植酸酶有显著反应。体重、脚趾骨灰分、胫骨骨灰分和磷保留率的等效值分别为每千克饲料251、597、391和390 U相当于1克磷。每千克饲料添加10000 U时，在体重增加和磷保留方面有显著反应，表明火鸡对高于每千克饲料1000 U的水平有反应。
