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The effect of vitamin a supplementation on seminal characteristics and vitamin a absorption in stallions
Authors:S.L. Ralston VMD   PhD   G.A. Rich PhD   S. Jackson BS  E.L. Squires PhD
Affiliation:1. Department of Animal Science, College of Agriculture and Natural Resources, University of Tehran, Karaj, Iran;2. Department of Animal Production, Faculty of Agriculture, Suez Canal University, Ismailia, Egypt;1. Department of Animal Science, University College of Agriculture and Natural Resources, University of Tehran, Karaj, Iran;2. Department of Clinical Sciences, Faculty of Veterinary Medicine, Shahid Chamran University, Ahvaz, Iran;3. Department of Clinical Sciences, Faculty of Veterinary Sciences, Bahauddin Zakariya University, Multan, Pakistan;1. Department of Animal Medicine, Laboratory of Equine Reproduction and Equine Spermatology, Veterinary Teaching Hospital, University of Extremadura, Cáceres, Spain;2. Department of Animal Medicine, University of León, León, Spain;1. State Key Laboratory of Grassland Agro-Ecosystems, College of Pastoral Agricultural Science and Technology, Lanzhou University, P. O. Box 61, Lanzhou 730020, PR China;2. Retired Scientist, New Zealand;1. Department of Veterinary Medicine and Animal Production, University of Naples “Federico II”, College Station, Naples, Italy;2. Department of Large Animal Clinical Sciences, College of Veterinary Medicine and Biomedical Sciences, Texas A&M University, Texas, USA
Abstract:
Fourteen mature stallions were paired based on age and pretreatment spermatozoal output. One member of each pair was assigned to either 1) control (3 ml corn oil) or 2) treated (132,000 IU retinyl palmitate in 3 ml corn oil) experimental groups. Treatments were added to oat rations every other day. Seminal characteristics (gel free volume, gel volume, total seminal volume, percent progressively motile spermatozoa, number of spermatozoa per ml, percentage morphologically normal spermatozoa and spermatozoal membrane stability) and total scrotal width of each stallion were recorded before (February) and after three months of vitamin A supplementation (June). Plasma vitamin A was measured at 0,6,12,24, and 48 hours following the first and last treatments to document absorption. There were no treatment effects (p>.05) on seminal characteristics or scrotal width. Seasonal increases were recorded in gel-free volume, total seminal volume, percent spermatozoal motility, total spermatozoal output, percentage of morphologically normal spermatozoa, and total scrotal width. Plasma vitamin A was lower during the second collection period (June) than the first (February) in both treatment groups. Peak plasma vitamin A was observed 48 hours following ingestion of the first dose of the vitamin but at 12 hours following the last treatment.
Keywords:
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