Seasonal thyroid and lipid profiles in Thoroughbred pregnant and nonpregnant mares (Equus caballus) |
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| Institution: | 1. Department of Veterinary Sciences, Unit of Veterinary Physiology, University of Messina, Messina, Italy;2. Department of Veterinary Sciences, Unit of Veterinary Biochemistry, University of Messina, Messina, Italy;1. Green Technology, Natural Resources Institute Finland, Ypäjä, Finland;2. Animal Medicine and Surgery Department, Unit of Reproduction, Faculty of Veterinary Medicine, Autonomous University of Barcelona, Spain;3. Preclinical Institution, Faculty of Veterinary Medicine, Latvian University of Agriculture, Jelgava, Latvia;4. Nuffield Department of Obstetrics and Gynaecology, University of Oxford, Level 3, Women''s Centre, John Radcliffe Hospital, Oxford, UK;5. Department of Production Animal Medicine, Faculty of Veterinary Medicine, University of Helsinki, Saarentaus, Finland;1. Department of Therapy, Institute of Veterinary Medicine and Animal Science, Estonian University of Life Sciences, Kreutzwaldi 62, 51014 Tartu, Estonia;2. Division of Reproduction, Department of Clinical Sciences, Faculty of Veterinary Medicine and Animal Science, Swedish University of Agricultural Sciences, P.O. Box 7054, 75007 Uppsala, Sweden;1. UMR BDR, INRA, ENVA, Université Paris Saclay, 78350, Jouy en Josas, France;2. IFCE, Station Expérimentale de la Valade, Chamberet, France;3. INRA, US 1426, GeT-PlaGe, Genotoul, Castanet-Tolosan, France;1. Department of Comparative Biomedical Sciences, The Royal Veterinary College, Hawkshead Lane, Hertfordshire AL9 7TA, United Kingdom;2. Department of Pathobiology and Population Sciences, The Royal Veterinary College, Hawkshead Lane, Hertfordshire AL9 7TA, United Kingdom |
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| Abstract: | The purpose of this study was to determine which physiological seasonal thyroid and lipid panel (triglyceride, TG], total cholesterol, tCho], high-density lipoprotein cholesterol, HDL Cho], LDL cholesterol, phospholipids, PDs]) changes occur in 12 Thoroughbred pregnant and six nonpregnant mares over a period of 12 months, from April to March, by into account the lactation stage. Serum total triiodothyronine (T3) and thyroxine (T4) levels were measured using immunoenzymatic assay kits; the serum lipid panel was analyzed using the enzymatic colorimetric method. One-way ANOVA reported a significant effect of time over 12 months for T3 (F = 5.46; P < 0.001) and T4 (F = 3.98; P < 0.001), in both pregnant and nonpregnant mares, and for triglyceride (F = 2.57; P < 0.01), tCho (F = 2.32; P < 0.01), HDL Cho (F = 5.60; P < 0.0001), and PDs (F = 7.01; P < 0.0001) in pregnant mares. Two-way ANOVA repoted a significant lactating effect compared with nonlactating stage for T3 (F = 8.33; P = 0.006), T4 (F = 6.43; P = 0.003), tCho (F = 10.38; P = 0.0078), HDL Cho (F = 7.64; P = 0.020), and PDs (F = 5.07; P = 0.048). Thus, it appears that under similar environmental condition, nutrition regime, and management system, lactation stage plays a significant role in the seasonal thyroid and lipid profiles in Thoroughbred pregnant mares, with higher T3, T4, and PDs values, and lower tCho and HDL Cho in lactating than nonlactating mares. The physiological values obtained in this study may be used as additional resources to evaluate thyroid and lipid profiles in Thoroughbred pregnant and nonpregnant mares, generating a wished numbers of observation, especially when the additional breed and physiological conditions are considered. |
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| Keywords: | Mare Thyroid hormone Triglyceride Cholesterol Phospholipid |
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