title: Variations in plasma growth hormone concentrations in laying hens.
abstract: 1. Variations in plasma concentrations of growth hormone (GH) and luteinising hormone (LH) were measured by radioimmunoassay in blood samples taken during the ovulatory cycle of the domestic hen. 2. A peak in LH concentrationas observed 4 h prior to ovulation. 3. Plasma GH concentrations were quite variable but a significant increase was observed between 2 h before and 2 h after ovulation and the concentration remained elevated for about 4 h thereafter.
mesh_terms: D000818:Animals; D002645:Chickens; D002940:Circadian Rhythm; D005260:Female; D013006:Growth Hormone / Q000097:blood*; D007986:Luteinizing Hormone / Q000097:blood; D010058:Oviposition; D011863:Radioimmunoassay
chemical_list: D007986:Luteinizing Hormone; D013006:Growth Hormone