04.12.2009, 21:44
Zitat:Zhonghua Yu Fang Yi Xue Za Zhi. 2009 Jun;43(6):509-12.
[The measurement of estrogen and progesterone in commercial and traditional
cow milk]
Zhou H, Qin LQ, Wang Y, Wang PY.
School of Public Health, Peking University, Beijing 100191, China.
OBJECTIVE: To detect the content of estrogen and progesterone in commercial
milk? in China and to compare the differences between commercial cows and
traditional cows in the content of estrogen and progesterone of the milk, the? reeding of cows and the process of milk production.
METHODS: Enzyme-linked immunosorbent assay (ELISA) was used to investigate the estrone, estradiol? andprogesterone in? commercial and traditional milk, and literature review and field investigation
was used to compare the differences of breeding and milk production. RESULTS:
The mean concentration of estrone, estradiol and progesterone in Mongolian
traditional cow milk was (98.5 +/- 12.4) pg/ml, (24.6 +/- 3.0) pg/ml and (0.2 +/- 0.3) ng/ml, respectively. The concentrations of estrone were (150.2 +/-? 8,4, (131.3 +/- 16.3) and (128.9 +/- 13.0) pg/ml; The concentrations of estradiol were (35.4 +/- 2.2), (30.3 +/- 3.1) and (30.0 +/- 2.0) pg/ml; The concentrations of progesterone were (20.2 +/- 1.5), (18.1 +/- 2.2) and (16.5 +/- 2.4) ng/ ml, respectively.
The content of estrogen and progesterone in
commercial milks were higher than that in traditional milks (estrone
comparison: t = 5.43, 19.23, 5.89; estradiol comparison: t = 4.14, 4.93,
14.03; progesterone comparison: t = 28.47,
32.73, 22.82; P < 0.05).
Mongolian traditional cows did not lactate during the latter half of pregnancy. However, modern commercial cows might lactate
almost in an entire period of pregnancy. Moreover, the lactating period was
longer and milk production was higher in modern commercial cows than that in traditional cows.
CONCLUSIONS: The content of estrogen and progesterone in
commercial milk in Chinese market detected might be higher than that in
traditional milk.
PMID: 19950719
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