Effect of fat supplementation during transition period on plasma leptin and non-esterified fatty acid concentrations in Holstein cows.
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.
Afzalzadeh
Ahmad
A
Department of Animal Science, University of Tehran, Abureihan Pardis, Tehran.
Palizdar
Mohammad Hossein
MH
Mahmoudzadeh
Homayoun
H
Niasari-Naslaji
Amir
A
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
D004041:Dietary Fats; D005230:Fatty Acids, Nonesterified; D020738:Leptin