Institut für Tierernährung, Universität Hohenheim, 70599 Stuttgart, Germany.
Poult Sci. 2012 Sep;91(9):2210-20. doi: 10.3382/ps.2012-02179.
The main objective of this study was to compare different bone measurements in response to supplements of mineral P sources. Comparisons were also made with P retention and digestibility responses determined in a companion study and with blood inorganic phosphate (P(i)) responses. A corn-soybean meal-based basal diet was used (0.35% total P on DM basis). Anhydrous monosodium phosphate (MSP(a)) or anhydrous dibasic calcium phosphate (DCP(a)) was supplemented to increment the P concentration by 0.08%, 0.16%, or 0.24%. Each of the 7 diets was fed for 10 d starting 11 d (period 1) or 25 d posthatch (period 2). Bone ash and P were determined, and density criteria were measured using quantitative computed tomography. Responses were evaluated and compared based on linear regression analysis. In general, responses to MSP(a) had a greater slope than DCP(a) for all criteria studied. In period 1, differences between the slopes were significant (P < 0.05) for almost all bone criteria. In period 2, the slopes significantly differed for the amounts of ash and P of all bones studied, for tibia, tarsometatarus, and foot ash percentage, for total and cortical density of tibiae, but not for the other criteria. For the different bones, the ratio of slopes for MSP(a) and DCP(a) was very similar based on the amount of ash in both periods. Foot ash proved to be as sensitive as tibia ash for evaluation of mineral P sources in both periods. Ninety-four percent of the variance of the corticalis content based on quantitative computed tomography measurements could be explained by the amount of tibia ash in period 1. Blood serum P(i) and BW gain were not suitable for P evaluation. We concluded that the ranking of mineral P sources based on bone criteria differed from the ranking that was based on P retention or prececal digestibility. This underlines the need for developing a standard protocol of determination of available P in poultry.
本研究的主要目的是比较不同的骨测量值对矿物质磷源补充的反应。还与在一项配套研究中确定的磷保留率和消化率反应以及血液无机磷（P(i)）反应进行了比较。使用基于玉米-豆粕的基础日粮（DM 基础上总磷 0.35%）。添加无水单磷酸一钠（MSP(a)）或无水磷酸二钙（DCP(a)），使磷浓度分别提高 0.08%、0.16%或 0.24%。7 种日粮中的每一种在孵化后第 11 天（第 1 期）或第 25 天（第 2 期）开始饲喂 10 天。测定骨灰分和磷含量，并使用定量计算机断层扫描测量密度标准。根据线性回归分析评价和比较反应。一般来说，与 DCP(a)相比，MSP(a)对所有研究指标的反应斜率更大。在第 1 期，几乎所有骨指标的斜率差异均具有统计学意义（P<0.05）。在第 2 期，所有研究骨骼的灰分和磷含量、胫骨、跗跖骨和足灰分百分比、胫骨总密度和皮质密度的斜率差异显著，但其他指标没有差异。对于不同的骨骼，基于两个时期灰分含量的 MSP(a)和 DCP(a)的斜率比非常相似。在两个时期，足灰分都像胫骨灰分一样，对矿物质磷源的评价都很敏感。基于定量计算机断层扫描测量的皮质含量的 94%的方差可以用第 1 期胫骨灰分来解释。血清 P(i)和 BW 增加不适合磷评价。我们得出结论，基于骨骼指标的矿物质磷源排名与基于磷保留率或盲肠消化率的排名不同。这强调了需要制定一个家禽有效磷测定的标准方案。
