title: Dietary energy density in the dry period on the metabolic status of lactating cows.
abstract: The aim of the study was to investigate the effect of different energy concentrations in the isonitrogenous diet fed during the dry period on postpartum health, fertility and blood variables. Forty Holstein multiparous cows were dried 56 days before the expected day of calving and assigned to group (M) with moderate energy concentrations of 0.69 UFL/kg DM or to the low-energy group (L) with energy density of 0.61 UFL/kg DM. From the 7d before the expected day of calving until the 21d of lactation, all the cows were fed the same fresh transition diet (0.82 UFL/kg DM). From the 22d to the 90d of lactation, all the cows received the same highest energy-density lactation diet (0.90 UFL/kg DM). During the dry period the decline of BCS in groups M and L were 0.07 and 0.12 units respectively. The average decrease of BCS from calving to 56 d of lactation were the same in both experimental groups (0.21 BCS). The first-service conception rate tended to be higher in the M group. Insulin-like growth factor-1, glucose, beta-hydroxybutyric acid, non-esterified fatty acid, thyroxine serum concentrations prepartum and 3 and 5d postpartum were not significantly affected by the treatment in the dry period.
authors.affiliation: Department of Animal Nutrition and Feed Management, Poznań University of Life Sciences, Wolyńska 33, 60-637 Poznań, Poland. nowakwl@jay.up.poznan.pl
authors.forename: W
authors.initials: W
authors.lastname: Nowak
authors.affiliation: Department of Animal Nutrition and Feed Management, Poznań University of Life Sciences, Wolyńska 33, 60-637 Poznań, Poland.
authors.forename: R
authors.initials: R
authors.lastname: Mikula
authors.affiliation: Department of Animal Physiology and Biochemistry, Poznań University of Life Sciences, Wolyńska 35, 60-637 Poznań, Poland.
authors.forename: E
authors.initials: E
authors.lastname: Pruszyńska-Oszmalek
authors.affiliation: Department of Animal Physiology and Biochemistry, Poznań University of Life Sciences, Wolyńska 35, 60-637 Poznań, Poland.
authors.forename: P
authors.initials: P
authors.lastname: Maćkowiak
authors.affiliation: Department of Animal Nutrition and Feed Management, Poznań University of Life Sciences, Wolyńska 33, 60-637 Poznań, Poland.
authors.forename: B
authors.initials: B
authors.lastname: Stefańska
authors.affiliation: Department of Animal Nutrition and Feed Management, Poznań University of Life Sciences, Wolyńska 33, 60-637 Poznań, Poland.
authors.forename: M
authors.initials: M
authors.lastname: Kasprowicz-Potocka
authors.affiliation: Department of Animal Nutrition and Feed Management, Poznań University of Life Sciences, Wolyńska 33, 60-637 Poznań, Poland.
authors.forename: A
authors.initials: A
authors.lastname: Frankiewicz
authors.affiliation: Department of Animal Nutrition and Feed Management, Poznań University of Life Sciences, Wolyńska 33, 60-637 Poznań, Poland.
authors.forename: K
authors.initials: K
authors.lastname: Drzazga
mesh_terms: D000821:Animal Feed / Q000032:analysis*; D000824:Animal Nutritional Physiological Phenomena; D000818:Animals; D001786:Blood Glucose; D002417:Cattle / Q000502:physiology*; D004032:Diet / Q000662:veterinary*; D002149:Energy Intake; D004734:Energy Metabolism; D005230:Fatty Acids, Nonesterified / Q000097:blood; D005260:Female; D007328:Insulin / Q000097:blood; D007334:Insulin-Like Growth Factor I / Q000378:metabolism; D007774:Lactation / Q000502:physiology*; D009751:Nutritional Requirements; D011247:Pregnancy; D013974:Thyroxine; D014284:Triiodothyronine
chemical_list: D001786:Blood Glucose; D005230:Fatty Acids, Nonesterified; D007328:Insulin; D014284:Triiodothyronine; D007334:Insulin-Like Growth Factor I; D013974:Thyroxine