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.
House
W A
WA
Department of Animal Science, Cornell University, Ithaca, NY 14853.
Bell
A W
AW
D000818:Animals; D002417:Cattle / Q000378:metabolism*; D005260:Female; D005333:Fetus / Q000378:metabolism; D005865:Gestational Age; D008099:Liver / Q000196:embryology / Q000378:metabolism; D009751:Nutritional Requirements; D011247:Pregnancy; D012044:Regression Analysis; D012643:Selenium / Q000378:metabolism*; D013455:Sulfur / Q000378:metabolism*; D013997:Time Factors; D014599:Uterus / Q000378:metabolism*
D013455:Sulfur; D012643:Selenium