title: Erythrocyte delta-aminolevulinic acid dehydrase changes in the preruminant calf.
abstract: Sixteen preruminant, male Holstein calves were tested for erythrocyte delta-aminolevulinic acid dehydrase activity, hemoglobin and erythrocyte count in blood samples taken weekly during the first 13 wk of life. delta-Aminolevulinic acid dehydrase showed a continual increase in activity beginning at wk 3 to a maximal activity at wk 9. Hemoglobin content was decreased by wk 5 and erythrocyte count was reduced by wk 6. delta-Aminolevulinic acid dehydrase enzyme activities increased with age corresponding to changes in hemoglobin and erythrocyte count during early postnatal development of the preruminant calf.
mesh_terms: D000367:Age Factors; D000818:Animals; D002417:Cattle / Q000378:metabolism*; D004906:Erythrocyte Count; D004912:Erythrocytes / Q000201:enzymology*; D006454:Hemoglobins / Q000378:metabolism; D006836:Hydro-Lyases / Q000097:blood*; D008297:Male; D000623:Porphobilinogen Synthase / Q000097:blood*
chemical_list: D006454:Hemoglobins; D006836:Hydro-Lyases; D000623:Porphobilinogen Synthase