Supplemental feeding with glycerol or propylene glycol of dairy cows in early lactation—Effects on metabolic status, body condition, and milk yield

摘要: The objective of this field study was to evaluate the effect supplemental feeding with glycerol or propylene glycol dairy cows in early lactation on metabolic status, body condition and milk yield. In total, 673 newly calved from 12 commercial Swedish herds were randomized daily supplementation 450 g (GLY), 300 (PG), nothing (control, CON). Supplements fed twice 0 21 d (DIM) as a top dress concentrates. For each cow, data parity, breed, calving date, monthly test-day yield, cases diseases collected. Blood samples taken at approximately 2, 5, 8 wk postpartum (pp) analyzed for glucose, β-hydroxybutyrate (BHBA), nonesterified fatty acids (NEFA), insulin. Samples within 3 pp also insulin-like growth factor 1 (IGF-1). Measurements score (BCS) heart girth (HG) obtained 2 5 time first insemination. effects GLY PG plasma concentrations NEFA, BHBA, insulin, IGF-1, BCS, HG, occurrence disease analyzed. No differences BCS HG IGF-1 found between control group any treatment groups. Cows had lower insulin during DIM 63 compared CON, but no difference CON group. supplemented higher yield (kg kg energy-corrected milk) 90 DIM. tended more same period. seen conclusion, did increase without subsequent decrease do same.