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Effect of a commercial active dry yeast (CNCM I-1079) on productive and metabolic measures during the periparturient transition.

M. R. Steelreath


Effect of a commercial active dry yeast (CNCM I-1079) on productive and metabolic measures during the periparturient transition.
M. R. Steelreath*1, H. C. Hung1, R. L. Hiltz1, M. N. Degenshein1, A. Aguilar2, H. Nielsen2, A. H. Laarman3, P. Rezamand1. 1Department of Animal and Veterinary Science, University of Idaho Moscow, ID, 2Lallemand Animal Nutrition Milwaukee, WI, 3Agricultural Food and Nutritional Science, University of Alberta Edmonton, AB, Canada.

The periparturient period is a metabolically demanding time for dairy animals because of the increased nutrient requirements for milk yield. The objective of this study was to investigate the effect of feeding a commercial active dry yeast (ADY) in dairy cows on productive and metabolic measures during the periparturient period. Primiparous (n = 33) and multiparous (n = 35) cows were fed a close-up TMR before calving and a lactation TMR postpartum. Three weeks before expected calving time, animals were blocked by parity and BW and then randomly assigned to either control group (CTRL; n = 34) or treatment (ADY; n = 34). The ADY animals received a top-dressed ADY (S.c. Boulardii, CNCM-1079) fed daily at 12.5 g per head (10 � 109 cfu). Blood samples were collected weekly. Milk yield, feed intake, and milk composition data were collected. Plasma/serum samples were analyzed for glucose, nonesterified fatty acid (NEFA), β-hydroxybutyrate (BHB), and haptoglobin (Hpt). Colostrum samples collected within the first 6—10 h were analyzed for somatic cell count (SCC) and IgG, IgA, IgM concentrations. Data were analyzed using PROC MIXED in SAS with time as a repeated measure. Model included time, parity, treatment, and their interactions. Significance was declared as P ≤ 0.05 and tendency at P < 0.1. The ADY animals produced more milk (39.3 vs 37.2 � 2.02 kg/d; P = 0.02), tended to produce more energy-corrected milk (ECM; 35.5 vs 34.2 � 1.44 kg/d; P = 0.07), and had a better feed efficiency (ECM/DMI; P = 0.06). There was a treatment � parity � time effect on milk protein percent; the multiparous ADY animals had a greater protein percent wk 2 postpartum (P < 0.01). There was not a difference in plasma glucose, serum NEFA, serum BHB, or colostrum IgG, IgA, and IgM by main effects or their interactions. Multiparous animals had a greater colostrum IgA (1011 vs. 749 � 38 mg/dL) but a lower SCC (926 vs. 1578 � 1000/mL). ADY animals had a greater serum Hpt (P = 0.03) while Hpt concentration peaked for all animals wk 1 postpartum. Research is needed to understand the effects of this ADY on metabolism.

Keywords: active dry yeast, periparturient cow, blood metabolites.

Biography: Maeghan Steelreath is a master's student studying the supplementation of an active dry yeast on dairy cows during the periparturient transition.