title: Effects of gossypol from cottonseed on hematological responses and plasma alpha-tocopherol concentration of dairy cows.
abstract: The effects of feeding whole cottonseed (WCS) and bovine somatotropin (bST) administration on hematological responses and plasma alpha-tocopherol concentrations of lactating dairy cattle were examined. After parturition, multi and primiparous Holstein cows (n = 159) were assigned randomly to a 2 x 2 factorial arrangement of treatments consisting of (0 or 15% WCS and 0 or 208 mg of bST injected every 2 wk starting within 7 d after calving. Blood samples were collected from a subset group of 64 cows at 14, 28, 42, and 56 d postpartum. Blood was collected from all cows (n = 159) at 75, 96 and 120 d postpartum. Blood samples were analyzed for alpha-tocopherol and total and (+)- and (-)-gossypol in plasma. Erythrocyte osmotic fragility, hemoglobin and hematocrit also were determined in blood. The mean concentrations of alpha-Tocopherol, total, and (+)- and (-)-gossypol were higher in cows fed WCS regardless of bST administration and plateaued by d 75 postpartum. Hematocrit and hemoglobin concentrations were not affected by treatments. Erythrocyte osmotic fragility was higher in cows fed WCS, but the increase was attenuated when bST was injected (diet x bST interaction). No clinical signs of gossypol toxicity were observed in the cows consuming the WCS.
authors.affiliation: College of Veterinary Medicine, University of Florida, Gainesville, FL 32611, USA. RiscoC@mail.vetmed.ufl.edu
authors.forename: C A
authors.initials: CA
authors.lastname: Risco
authors.forename: A L
authors.initials: AL
authors.lastname: Adams
authors.forename: S
authors.initials: S
authors.lastname: Seebohm
authors.forename: M J
authors.initials: MJ
authors.lastname: Thatcher
authors.forename: C R
authors.initials: CR
authors.lastname: Staples
authors.forename: H H
authors.initials: HH
authors.lastname: Van Horn
authors.forename: L R
authors.initials: LR
authors.lastname: McDowell
authors.forename: M C
authors.initials: MC
authors.lastname: Calhoun
authors.forename: W W
authors.initials: WW
authors.lastname: Thatcher
mesh_terms: D000818:Animals; D002417:Cattle / Q000097:blood*; D003369:Cottonseed Oil; D004032:Diet; D005260:Female; D006072:Gossypol / Q000097:blood / Q000494:pharmacology*; D013006:Growth Hormone / Q000008:administration & dosage; D006400:Hematocrit; D006454:Hemoglobins / Q000032:analysis; D007774:Lactation; D009996:Osmotic Fragility; D010298:Parity; D024502:alpha-Tocopherol / Q000097:blood*
chemical_list: D003369:Cottonseed Oil; D006454:Hemoglobins; C073294:growth hormone, bovine; D013006:Growth Hormone; D024502:alpha-Tocopherol; D006072:Gossypol