title: Long-term effects of feeding gossypol and vitamin E to dairy calves.
abstract: Male Holstein calves were used to test the effect of feeding 400 mg of free gossypol/kg of diet and to determine whether vitamin E could counteract gossypol toxicity. Fifty-two calves were allotted to treatments as follows: 1) soybean meal-based starter; 2) cottonseed meal-based starter; 3) cottonseed meal-based starter + 2000 IU of vitamin E/d per calf, and 4) cottonseed meal-based starter + 4000 IU of vitamin E/d per calf. Vitamin E supplementation (treatments 3 and 4) improved weight gain and feed intake over calves on treatment 1. Gossypol concentrations in plasma were higher in calves on treatments 2, 3, and 4 than in calves on treatment 1; however, no differences were observed among animals receiving the three cottonseed meal diets. Hemoglobin and hematocrit were decreased in calves receiving treatment 2, and vitamin E supplementation counteracted this effect (treatments 3 and 4). Plasma alpha-tocopherol concentrations were not affected by gossypol intake and followed the vitamin E supplementation pattern During the experimental period, 10 calves died, six from treatment 2 and two each from treatments 3 and 4. Necropsy findings from 4 of 10 calves were suggestive of gossypol toxicity. Histopathological examination revealed centrilobular necrosis in the liver and atrophy and vacuolation of cardiocytes. Feeding cottonseed meal caused death of some calves with gossypol related toxicity signs, but did not decrease plasma alpha-tocopherol; however, vitamin E supplementation increased performance and may have conferred some protection against gossypol toxicity.
authors.affiliation: Department of Animal Science, University of Florida, Gainesville 32611, USA.
authors.forename: J
authors.initials: J
authors.lastname: Velasquez-Pereira
authors.forename: C A
authors.initials: CA
authors.lastname: Risco
authors.forename: L R
authors.initials: LR
authors.lastname: McDowell
authors.forename: C R
authors.initials: CR
authors.lastname: Staples
authors.forename: D
authors.initials: D
authors.lastname: Prichard
authors.forename: P J
authors.initials: PJ
authors.lastname: Chenoweth
authors.forename: F G
authors.initials: FG
authors.lastname: Martin
authors.forename: S N
authors.initials: SN
authors.lastname: Williams
authors.forename: L X
authors.initials: LX
authors.lastname: Rojas
authors.forename: M C
authors.initials: MC
authors.lastname: Calhoun
authors.forename: N S
authors.initials: NS
authors.lastname: Wilkinson
mesh_terms: D000821:Animal Feed; D000818:Animals; D001284:Atrophy; D002417:Cattle; D002418:Cattle Diseases / Q000139:chemically induced* / Q000401:mortality / Q000517:prevention & control*; D006072:Gossypol / Q000008:administration & dosage / Q000009:adverse effects*; D006400:Hematocrit; D006454:Hemoglobins / Q000378:metabolism; D008099:Liver / Q000473:pathology; D008297:Male; D009206:Myocardium / Q000473:pathology; D009336:Necrosis; D014810:Vitamin E / Q000008:administration & dosage / Q000097:blood / Q000627:therapeutic use*; D015430:Weight Gain
chemical_list: D006454:Hemoglobins; D014810:Vitamin E; D006072:Gossypol