منابع مشابه
Selected Biochemical Indices in Sheep during Pregnancy and after Parturition
The aim of the study was to establish differences in energetic, protein, and enzymatic profiles in ewes bearing single or twin lambs. Blood samples were collected from 40 ewes of improved Wallachian breed at the beginning of pregnancy, one month before parturition, shortly after parturition, and one month after parturition. Significantly (P<0.01) lower glucose levels (2.13 vs. 2.59 mmol.l) in t...
متن کاملTime/frequency analysis of the uterine EMG in pregnancy and parturition in sheep
The aim of this study was to evaluate the electromyographic (EMG) activity of smooth musc1es of uterine cervix (UC) and uterine horn (UH) in sheep during pregnancy and parturition in time/frequency domain and to recognize the differences between the two activities. The uterine electromyographic activity was recorded in eight sheep by electrodes, surgically implanted on UC and UH during pregnanc...
متن کاملThe Mechanism by which Foetal Cortisol Controls the Onset of Parturition in the Sheep
The sheep is one of the few species in which there is good evidence that the foetus is involved in determining the length of pregnancy. Parturition in the sheep is prevented by foetal hypophysectomy (Liggins etal., 1967; Comline etal., 1970; Bosc, 1972) or adrenalectomy (Drost & Holm, 1968), and can be induced prematurely by intrafoetal administration of ACTH* or glucocorticoid (Liggins et al.,...
متن کاملEffects of periconceptional undernutrition on the initiation of parturition in sheep.
In sheep, parturition is initiated by increased fetal hypothalamic-pituitary-adrenal axis (HPAA) activity leading to PGE(2) and PGF(2alpha) production and a rise in the 17beta-estradiol-progesterone (E(2)/P(4)) ratio. Uteroplacental PG production can also increase fetal HPAA activity. Periconceptional maternal undernutrition accelerates fetal HPAA maturation resulting in preterm labor. We deter...
متن کاملHormonal control of gap junction formation in sheep myometrium during parturition.
The ultrastructure of myometrial tissues from nonpregnant, pregnant and postpartum sheep was quantitatively examined for the presence of gap junctions between smooth musde cells. Serum concentrations of estrone, estradiol and progesterone were determined in some of the sheep prior to and at the time of sacrifice. Gap junctions were not present in any tissue from nonpregnant animals or in tissue...
متن کاملذخیره در منابع من
با ذخیره ی این منبع در منابع من، دسترسی به آن را برای استفاده های بعدی آسان تر کنید
ژورنال
عنوان ژورنال: Animal Reproduction Science
سال: 1985
ISSN: 0378-4320
DOI: 10.1016/0378-4320(85)90065-x