Influence of gestation on oestrone sulphate concentration in milk of zebu and crossbred cows and murrah buffaloes
Influence of gestation on oestrone sulphate concentration in milk of zebu and crossbred cows and murrah buffaloes
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妊娠对瘤牛、杂交奶牛和墨拉水牛乳中硫酸雌酮浓度的影响
DOI：
10.1007/bf02236514
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发表时间：
1993
影响因子：
1.7
通讯作者：
M. Madan
中科院分区：
文献类型：
--
作者：
B. Prakash;M. Madan
通过实验室开发的灵敏、直接的放射免疫测定程序，对128头Sahiwal （zebu）奶牛、295头Karan Swiss奶牛和198头Karan Fries奶牛以及164头Murrah水牛在怀孕期间收集的单乳样本进行了硫酸雌酮分析。所有动物妊娠头2个月的平均硫酸雌酮水平均低于检出限（< 50 pg/ml）。从妊娠第4个月开始，奶牛的激素浓度呈指数增长，其中萨希瓦尔奶牛的增长速度最大，卡兰瑞士奶牛次之，卡兰弗里斯奶牛次之（P< 0.01）。从妊娠第四个月开始，水牛体内硫酸雌酮水平也呈指数增长。然而，这个品种的平均激素水平在怀孕6个月之前低于Sahiwal和Karan瑞士奶牛，此后上升到更高的水平。
Single milk samples collected during pregnancy from 128 Sahiwal (zebu), 295 Karan Swiss and 198 Karan Fries cows and 164 Murrah buffaloes were analysed for oestrone sulphate by a sensitive, direct, radioimmunoassay procedure developed in the laboratory.Mean oestrone sulphate levels were below detection limit (< 50 pg/ml) during the first 2 months of pregnancy in all animals. There was an exponential increase in the hormone concentration beginning at the fourth month of pregnancy in cows, although the rate of increase was greatest among Sahiwal cows, followed by Karan Swiss and Karan Fries cows in that order (P< 0.01). An exponential increase in oestrone sulphate levels was also recorded in buffaloes beginning at the fourth month of gestation. However, the mean hormone levels in this species, after initially being lower than Sahiwal and Karan Swiss cows up to 6 months of pregnancy, increased to higher levels thereafter.