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At least 541 records · Page 30Linked to original sources
PubMed1994

Sulfur and selenium accretion in the gravid uterus during late gestation in Holstein cows.

Multiparous Holstein cows (n = 18) were bred artificially to the same Holstein bull and then slaughtered at times from 190 to 270 d postmating to assess S and Se accretion in the fetus and nonfetal components of the conceptus. Concentrations of S and Se were obtained for the fetus, fetal fluids, fetal membranes, cotyledons, caruncles, and uterine tissues. Also, Se concentrations were determined in liver samples from 15 of the fetus-dam pairs. The Se concentration in fetal liver was greater than the corresponding Se concentration in maternal liver for all fetus-dam pairs. Accumulation rates of S and Se in components of the conceptus were determined from linear or exponential functions relating S and Se contents to day postmating. When estimated from linear regression coefficients, accretion rates of S for the fetus and entire conceptus were 1.26 and 1.51 g/d, respectively; corresponding accretion rates for Se in the fetus and entire conceptus were 41 and 55 micrograms/d, respectively. These rates provided estimates of net amounts of S and Se utilized for conceptus growth during late pregnancy. Estimates of total needs for S and Se during late pregnancy in dairy cows may be obtained by adding requirements for conceptus development to allowances for maternal maintenance. Current dietary allowances for S and Se appear to be sufficient to meet the requirements for S and Se for growth of the conceptus during the dry period.

Animals↗
PubMed1995

Doppler sonographic studies on the ophthalmic and central retinal arteries in the gravid woman.

The aim of this study was to establish normative data as gestation advances for pulsed Doppler evaluation of both the ophthalmic artery and the central retinal artery. After measuring intraocular pressure and blood pressure, pulsed Doppler ultrasonographic examination was performed on the ophthalmic and central retinal arteries in both eyes of 125 normal pregnant women. Nomograms, with 95% prediction intervals, have been generated for the Doppler indices, reflecting blood flow in both the ophthalmic and the central retinal arteries. The use of this technique in the management of pregnancy induced hypertension can now be better evaluated.

Blood Pressure↗
PubMed1978

[Carotene and fluorometrically determined vitamin A levels in the blood plasma of cows in relation to gravidity and type of feeding].

From January to June we determined the concentration of vitamin A and carotene in the blood plasma of 66 high-pregnant cows and cows 23 to 54 days after calving. Seasonal changes and a decrease in the content of both substances before delivery were proved. In field conditions of three farms it was determined that the haylage type of winter feeding was better than the silage type of winter feeding in view of provitamin A supply. The concentration of carotene in blood was always higher with haylage feeding as well as that of vitamin A during the period of high lactation. Regardless of that the level of vitamin A in dairy cows in April and May was lower by almost a quarter compared with feeding fresh green forage in June. The results reveal that the suitable time for assessing the sufficiency of vitamin A supply in cows is the time starting one month after the beginning of lactation. The usability and accuracy of the fluorometric method for determining vitamin A, while respecting the interference caused by phytofluen and beta-carotene, have been proved.

Animal Feed↗