101
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Drost M. Failure to induce parturition in pony mares with dexamethasone. J Am Vet Med Assoc 1972; 160:321-2. [PMID: 5009513] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/13/2023]
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102
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Creasy RK, Drost M, Green MV, Morris JA. Effect of ventilation on transfer of blood from placenta to neonate. THE AMERICAN JOURNAL OF PHYSIOLOGY 1972; 222:186-8. [PMID: 4551203 DOI: 10.1152/ajplegacy.1972.222.1.186] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/11/2023]
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103
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Stabenfeldt GH, Drost M, Franti CE. Peripheral plasma progesterone levels in the ewe during pregnancy and parturition. Endocrinology 1972; 90:144-50. [PMID: 5009054 DOI: 10.1210/endo-90-1-144] [Citation(s) in RCA: 46] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 01/13/2023]
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104
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Creasy RK, Drost M, Green MV, Morris JA. Determination of fetal, placental and neonatal blood volumes in the sheep. Circ Res 1970; 27:487-94. [PMID: 4918731 DOI: 10.1161/01.res.27.4.487] [Citation(s) in RCA: 45] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 01/13/2023]
Abstract
A sheep preparation was developed for studying fetoplacental and neonatal blood volumes using isotope dilution techniques. Fetoplacental blood volume was measured in 46 fetal lambs (gestational age 112 to 146 days) using radioactive iodinated human serum albumin (
125
I-RISA). In 28 of the 46 animals, blood volume was also computed using
125
I-RISA and maternal red cells labeled with radiochromium (
51
Cr). Blood volume averaged 156.1 ml/kg of fetal weight with the single-label method and 134.7 ml/kg with the double-label method. Blood volumes measured in 17 neonatal lambs with the single-label technique averaged 110.0 ml/kg, and with the double-label technique in 10 animals averaged 104.0 ml/kg. Placental blood volume, determined by subtracting the neonatal blood volume from the fetoplacental blood volume, although varying from animal to animal, was independent of fetal weight and remained relatively constant during the last fourth of gestation.
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Abstract
SUMMARY
Complete bilateral removal of the adrenal glands of sheep foetuses in utero resulted in failure of the ewes to undergo labour. Thirty-seven ewes with dated pregnancies were operated on approximately 1 month before term. Eight foetuses were carried in utero past term; all showed definite signs of postmaturity.
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