Walker G L, Danielson D M, Peo E R, Mumm R F
University of Nebraska West Central Research and Extension Center, North Platte 69101.
J Anim Sci. 1993 Jan;71(1):124-31. doi: 10.2527/1993.711124x.
A study was conducted with gravid gilts to determine the bioavailability of Ca in sun-cured alfalfa meal (AM) and the effect of dietary Ca concentration on bone and blood characteristics during two phases of gestation. Two Ca sources (AM and CaCO3), three dietary concentrations of Ca (50, 75, and 100% of the NRC requirement), and two gestation phases (55 and 105 d) were used in a 2 x 3 x 2 factorial arrangement in a randomized design with five replications (60 gravid gilts). Response criteria were as follows: 1) plasma Ca, P, and alkaline phosphatase (AKP) measured at the onset and at 25-d intervals and 2) metacarpal (MC) and metatarsal (MT) bone breaking strength (kilograms), ash content (percentage), density (grams/cubic centimeter), and ash density (grams of ash/cubic centimeter) at the conclusion of the experiment. Plasma Ca, P, and AKP concentrations were similar between Ca sources. Because the response between Ca sources was similar, the data were pooled among sources. There was a linear decline in plasma P and AKP (P < or = .05) as dietary Ca concentration increased. As gestation progressed from 0 to 100 d, there was a decline (P < .05) in plasma Ca and P. There were no differences in bone breaking strength and ash between Ca sources in either the MC or MT. No differences in bone strength between gestation phases occurred. A gestation phase x dietary Ca concentration interaction (P < .05) was observed for bone ash in both bones.(ABSTRACT TRUNCATED AT 250 WORDS)
对妊娠小母猪进行了一项研究，以确定日晒苜蓿草粉（AM）中钙的生物利用率以及在妊娠两个阶段日粮钙浓度对骨骼和血液特性的影响。在随机设计中采用2×3×2析因排列，使用两种钙源（AM和碳酸钙）、三种日粮钙浓度（NRC需求量的50%、75%和100%）以及两个妊娠阶段（55天和105天），每组5个重复（共60头妊娠小母猪）。反应标准如下：1）在试验开始时及每隔25天测定血浆钙、磷和碱性磷酸酶（AKP）；2）在试验结束时测定掌骨（MC）和跖骨（MT）的骨断裂强度（千克）、灰分含量（百分比）、密度（克/立方厘米）和灰分密度（克灰分/立方厘米）。两种钙源之间的血浆钙、磷和AKP浓度相似。由于钙源之间的反应相似，因此将数据合并。随着日粮钙浓度的增加，血浆磷和AKP呈线性下降（P≤0.05）。随着妊娠从0天进展到100天，血浆钙和磷下降（P<0.05）。MC或MT中两种钙源之间的骨断裂强度和灰分无差异。妊娠阶段之间的骨强度无差异。在两根骨骼中均观察到妊娠阶段×日粮钙浓度对骨灰分的交互作用（P<0.05）。（摘要截断于250字）
