TY  - SER
AU  - Fahmy ,S.
TI  - Concentration of progesterone, estradiol-17B, calcium, phosphorus and Ca/P ratio in blood serum of friesian cows during late pregnancy, parturition and postpartum period in upper Egypt
KW  - Cows
KW  - Reproduction
KW  - Fertility
KW  - Progesterone
KW  - Physiological effect
KW  - Estradiol
N1  - Includes references
N2  - Twelve Friesian cows were used to study the serum changes of progesterone, estradiol-17P, calcium and phosphorus concentrations, in the periparturient. Serum progesterone level showed little changes among weeks 9,7 and S prepartum. Then the levels decreased significantly (P<0.05 weeks 9, 7, S and 3 to reach a minimum level (P<0.01) at the timing parturition. The serum progesterone level kept minimum « 1.0 pg/ml) up to weeks Sand 9 after parturition in early and later conceived respectively. Then the level started to increase about 1 pg/ml 9 week after birth in early conceived. Serum estradiol 1 7p increased progressively from 4.19 ± 0.7pg/ml weeks 9 before birth to a beak (99.53 ± 25.98pg/m1) on the day of parturition (P<0.05), the differences among weeks 9th to 5th  prepartum were non significant Then the levels sharply drop to 2.83  ±     0.31 and 2.1 ± 0.27pg/ml one week after birth (P<O.OS) in early and later conceived respectively. The level remained low throughout the 9 weeks after birth in both early and later conceived. Calcium and phosphorus levels were highly (P<0.05) in prepartum, and then steadily decreased till parturition. In postpartum, there was general trend that the level of calcium increased gradually to reach maximum level at 9th week in both early and later conceived. While phosphorus level increased gradually to reach maximum at 7th and 9th weeks in early and later conceived respectively. changes in Ca/p ratio in the cow was not significantly from 9th to 3rd weeks prepartum. While the Ca/p ratio dropped drastically (P<0.01) at parturition. Postpartum Ca/p ratio increased gradually advances reached maximum ratio at 9th week postpartum in early-conceived group. On the other hand, the Ca/P ratio in late conceived group reached maximum at 7th  week postpartum. Key words: Cows, peri parturient, progesterone, Estradiol-17B, Calcium, Phosphorus
UR  - http://nile.enal.sci.eg/EALE/2004/AVMJ/5004/101/293.pdf
ER  -