The sutures in the skulls of young mammals have been advanced as a beautiful adaptation for aiding parturition
, and no doubt they facilitate, or may be indispensable for this act; but as sutures occur in the skulls of young birds and reptiles, which have only to escape from a broken egg, we may infer that this structure has arisen from the laws of growth, and has been taken advantage of in the parturition
of the higher animals.
The significance of the phenomenon is manifested by fetal and placental abnormalities that are associated with increased rates of pregnancy losses, particularly in the first 60 days of gestation (11, 17, 18, 19), and placental and fetal alterations that culminate in hydrops of the fetal membranes, late abortion, prolonged gestation, diminished signs of parturition
, dystocia and birth of large calves with lower postnatal survival (5, 7, 8, 10, 11, 12, 13, 20, 21, 22, 23, 24, 25, 26).
, the process by which the fetus is expelled from the uterus, is largely stimulated by increased expression of uterine oxytocin receptors (OXTR) and increased synthesis of intrauterine prostaglandin (PG) [E.
One female from February (LACM 166231) contained corpora lutea and convoluted oviducts indicating parturition
had recently occurred.
In many cases this results in a period of infertility following parturition
Effects of induced parturition
and early obstetrical assistence in beef cattle.
Therapeutic interventions that target earlier steps in parturition
should prove more effective in delaying birth than currently used agents, which have only limited effectiveness.
Unlike other NSAID's orally administered, BA failed to prolong gestation period, parturition
time in pregnant rats and did not affect the of castor oil-induced diarrhea effects attributed to inhibition of PG's.
sipedon were hand collected from Collins Creek (Butler County, Ohio) and maintained in the laboratory until parturition
As a paradigm of human subjectivity, pregnancy, birth and parturition
dramatise a dynamic nexus of transition or becoming--a drama of attachment and dependence, yet also of emergence and differentiation.
However, the litter size at weaning of does fed a high-energy, low-fiber diet may be greater than that of does fed a lower-energy, higher-fiber diet because of the increased energy reserves in these bunnies at parturition
(Xiccato, Bernardini, Castellini, Dalle Zotte, Queaque, & Trocino, 1999).
Arctic foxes prefer to use dens excavated in sandy, well-drained substrate for parturition
and pup-rearing (Audet et al.