Calcium decreases and parathyroid hormone increases in serum of periparturient mares.
Calcium decreases and parathyroid hormone increases in serum of periparturient mares.
复制标题
围产期母马血清中的钙含量减少，甲状旁腺激素增加。
DOI：
10.2527/1996.744834x
复制
发表时间：
1996
影响因子：
3.3
通讯作者：
L. Warnick
中科院分区：
文献类型：
--
作者：
K. L. Martin;R. Hoffman;D. Kronfeld;W. Ley;L. Warnick
围产期母马血清钙和甲状旁腺激素(PTH)浓度的变化可能受日粮钙的影响，并可能与乳汁中钙浓度的变化有关。产前10d和产后5d分别从A场8匹和B场8匹母马采集乳汁和血样。牛奶钙是通过两个商业测试来测量的。对16匹母马的血清进行了甲状旁腺素和总钙的测定，并对A场的6匹母马进行了离子钙测定。对A场8匹和B场4匹母马进行了引产，引产后母马的血清钙和甲状旁腺素水平与自然分娩的母马无显著差异。平均血清总钙从产后第2天的12.5 mg/dL降至最低的11 mg/dL，平均甲状旁腺素从产后第2天的46pg/m L升至峰值186pg/m L。A场母马血清总钙浓度低于B场马，而血清PTH浓度高于B场马，这可能反映了饲粮钙(A场占DM的0.35%，B场占0.55%)。血清甲状旁腺素峰值和钙最低值出现在产后第2天，比已报道的奶牛晚1d。乳钙浓度从分娩前7d开始逐渐升高；这种升高先于产前血清钙和甲状旁腺素的变化，因此不依赖于产前的变化。
Changes in serum concentrations of Ca and parathyroid hormone (PTH) may develop in periparturient mares, may be influenced by dietary Ca, and may be associated with changes in Ca concentration of mammary secretion. Milk and blood samples were taken from eight mares on Farm A and eight on Farm B for 10 d before parturition and from four mares on each farm for 5 d postpartum. Milk Ca was measured by two commercial tests. Serum samples were analyzed for PTH and total Ca in 16 mares and for ionized Ca in six (Farm A). Parturition was induced in eight mares on Farm A and four on Farm B; no significant difference in serum Ca or PTH was found between mares with induced and spontaneous foaling. Mean serum total Ca decreased from 12.5 mg/dL to a nadir of 11 mg/dL on d 2 postpartum, and mean PTH increased from 46 pg/mL to a peak of 186 pg/mL on d 2 postpartum. Serum total Ca concentrations were lower and serum PTH concentrations were higher in Farm A mares than in Farm B mares, probably reflecting dietary Ca (.35% of DM on Farm A and .55% on Farm B). The serum PTH peak and Ca nadir occurred on d 2 postpartum, 1 d later than reported previously in dairy cows. Milk Ca concentration increased progressively from 7 d before parturition; this increase preceded, so was not dependent on, prepartal changes in serum Ca and PTH.