Carotenoid and vitamin A metabolism of cows and calves on the Bull Evaluation Station in Jastrzcbiec. II. Carotenoid and vitamin A levels in blood serum and milk of cows
Biul. Inst. Genet. Hodowli Zwierz, 22, 51-64
Carotenoid and vitamin A levels were determined during 1966/67 in colostrum on the day of calving and in milk and blood serum at 2-wk intervals during 305 days of lactation of (i) 6 Polish Black-and-White Lowland heifers that calved in Sept. or early Oct., (ii) 6 heifers that calved in late Oct. or Nov. and (iii) 5 heifers that calved in Dec. or early Jan.