title: Effect of fat supplementation during transition period on plasma leptin and non-esterified fatty acid concentrations in Holstein cows.
abstract: The objective of this experiment was to investigate the effect of fat supplementation during the transition period on pre and postpartum body weight (BW), body condition score (BCS), non-esterified fatty acids (NEFA), glucose and leptin concentrations in Holstein cows. Holstein cows (n = 15) received a low fat diet (LF; 1.61 Mcal net energy for lactation (NEL)/kg of dry matter [DM]), moderate fat diet (MF; 1.68 Mcal NEL/kg DM) or a high fat diet (HF; 1.74 Mcal NEL/kg DM) for 4 weeks prior to calving. All cows were fed similar lactation diets ad libitum (1.74 Mcal NEL/kg DM) for 30 days after calving. Increasing diet energy density during transition period had no effect on prepartum DMI, BCS, BW, glucose and NEFA concentrations (P > 0.05); but leptin concentrations and energy balance (EB) were affected by treatments (P < 0.05). Animals fed HF had less plasma leptin prepartum. After parturition, BW, milk production, milk fat, protein, urea nitrogen and plasma glucose concentrations were affected by prepartum diets (P < 0.05). Fat supplementation prepartum did not affect postpartum NEFA. In conclusion, prepartum fat supplementation decreased leptin concentration prepartum.
authors.affiliation: Department of Animal Science, University of Tehran, Abureihan Pardis, Tehran.
authors.forename: Ahmad
authors.initials: A
authors.lastname: Afzalzadeh
authors.forename: Mohammad Hossein
authors.initials: MH
authors.lastname: Palizdar
authors.forename: Homayoun
authors.initials: H
authors.lastname: Mahmoudzadeh
authors.forename: Amir
authors.initials: A
authors.lastname: Niasari-Naslaji
mesh_terms: D000821:Animal Feed; D000818:Animals; D002417:Cattle / Q000097:blood / Q000378:metabolism*; D004041:Dietary Fats / Q000378:metabolism*; D005230:Fatty Acids, Nonesterified / Q000097:blood*; D005260:Female; D007774:Lactation / Q000378:metabolism; D020738:Leptin / Q000097:blood*; D049590:Postpartum Period / Q000378:metabolism
chemical_list: D004041:Dietary Fats; D005230:Fatty Acids, Nonesterified; D020738:Leptin