title: Effect of fat supplementation on leptin, insulin-like growth factor I, growth hormone, and insulin in cattle.
abstract: We investigated the effect of fat supplementation on plasma levels of hormones related to metabolism, with special attention to leptin, in cows in early lactation and in feedlot steers. In experiment 1, 34 lactating cows received no fat or else 0.5 or 1.0 kg of partially hydrogenated oil per day in addition to their basal diet from day 20 before the expected calving date to day 70 postpartum. In experiment 2, part of the corn in the basal concentrate was replaced with 0.7 kg of the same oil such that the diets were isocaloric; 18 cows received the fat-substituted diet and 18 a control diet from day 20 before the expected calving date to day 75 postpartum. In experiment 3, calcium salts of fatty acids were added to the basal diet of 14 feedlot steers for 80 d; another 14 steers received a control diet. The basal plasma levels of leptin were higher in the cows than in the steers. Dietary fat supplementation did not affect the leptin levels in the lactating cows but lowered the levels in the feedlot steers despite greater energy intake and body fatness (body weight) in the steers receiving the supplement than in those receiving the control diet. The levels of insulin-like growth factor I and insulin were decreased with dietary fat supplementation in the lactating cows but were unaffected in the steers, suggesting that responses to fat ingestion depend on the physiological state of the animal, including age and sex. Finally, no effects of supplementary fat on the level of growth hormone were demonstrated in any of the models.
authors: Laboratorio de Regulaci6n Hipofisaria, Instituto de Biología y Medicina Experimental, Vuelta de Obligado 2490, 1428 Buenos Aires, Argentina.
authors: Damasia
authors: D
authors: Becú-Villalobos
authors: Isabel
authors: I
authors: García-Tornadú
authors: Guillermo
authors: G
authors: Shroeder
authors: Eloy E
authors: EE
authors: Salado
authors: Gerardo
authors: G
authors: Gagliostro
authors: Carole
authors: C
authors: Delavaud
authors: Yves
authors: Y
authors: Chilliard
authors: Isabel M
authors: IM
authors: Lacau-Mengido
mesh_terms: D000367:Age Factors; D000824:Animal Nutritional Physiological Phenomena / Q000502:physiology*; D000818:Animals; D002417:Cattle; D004042:Dietary Fats, Unsaturated / Q000008:administration & dosage*; D019587:Dietary Supplements; D004305:Dose-Response Relationship, Drug; D005260:Female; D013006:Growth Hormone / Q000097:blood; D006865:Hydrogenation; D007328:Insulin / Q000097:blood; D007334:Insulin-Like Growth Factor I / Q000378:metabolism; D007774:Lactation / Q000378:metabolism*; D020738:Leptin / Q000097:blood*; D008297:Male; D011247:Pregnancy; D011270:Pregnancy, Animal / Q000378:metabolism*; D011897:Random Allocation; D012737:Sex Factors
chemical_list: D004042:Dietary Fats, Unsaturated; D007328:Insulin; D020738:Leptin; D007334:Insulin-Like Growth Factor I; D013006:Growth Hormone
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