The Effect of Vitamin A Stores and Carotene Intake of Beef Cows on the Vitamin A Content of the Liver and Plasma of their Calves

Analysis of published and clinical sample data to develop new ranges of liver and blood concentrations of vitamin A for diagnosis of vitamin A deficiency in cattle

“…A literature review harvested paired and unpaired serum/ plasma and liver VA data for individual beef or dairy cattle, or herd data, from studies 13,[26][27][28][29] and one thesis 30 Articles with strongly asymmetrical summary data (e.g., mean and median were statistically unequal, the median was greater than the mean, the skew was significantly different from zero, or the mean minus twice the standard deviation was negative) or that were missing data necessary for evaluating relationships (e.g., correlations between tissues within animals, dam and neonate, or feed and tissue concentrations) were also excluded.…”

The Vitamin a Requirement of the Young Pig

“…high vitamin A dietary regime for the dam during gestation, although building up her liver reserves and influencing her fetus to some measurable extent, has a small influence on the cow*s colostrum(8,54) and the colostrum of the rat(97).…”

The vitamin A requirement of the young pig

“…dietary regime for the dam during gestation, although building up her liver reserves and influencing her fetus to some measurable extent, has a small influence on the cow*s colostrum (8,54) and the colostrum of the rat (97).…”

“…The colostrum and milk vitamin A is largely a function of the diet during lactation (8,97) « Yet with the sow (22) Immediately prior to and following parturition this maternal serum vitamin A level of the rat (97), of cows and heifers (254), of the sow (187), and of the ewe, but less marked (194), is depressed below that of later lacta tion, even though this lactation is a continual drain on the reserves. The depression may be connected with the very high vitamin A concentration occurring in the colos trum, rather than a direct hormonal influence.…”

“…779. Thyroid secretion rate constants (b) at 13 weeks of age using ll31 and thiouracil8 Regr. coefficient on vitamin A level is signif.…”