Adsa Logo White Adsa Title White

Effect of dietary supplementation with live yeast on lactation performance and milk fatty acid profile in high-producing dairy cows.

M. Z. Toledo

Events

06-24-2020

Join M. Z. Toledo on this page for a live text chat!
6:00 PM - 8:00 PM GMT

Abstract:

W98
Effect of dietary supplementation with live yeast on lactation performance and milk fatty acid profile in high-producing dairy cows.
M. Z. Toledo*1, C. M. Feuerbach1, S. Miller2, J. P. N. Andrade1, C. Julien3, S. Emanuele3, S. Bertics1, R. D. Shaver1, M. C. Wiltbank1. 1University of Wisconsin-Madison Madison, WI, 2Tuskegee University Tuskegee, AL, 3Phileo Lesaffre Animal Care Marcq-en-Bar�ul, FRA.

Objectives were to evaluate the effects of dietary supplementation with live yeast (2.1010 cfu/g Saccharomyces cerevisiae; ActiSaf Sc48) on milk yield and composition, DMI, body condition score (BCS), BW, and milk fatty acid (MFA) profile of high-producing dairy cows. Multiparous (n = 96) and primiparous (n = 32) cows were stratified by parity, DIM, and milk production, and randomly assigned to 16 pens of 8 cows each in a freestall barn. Cows were milked 2X daily, and pen-fed a basal diet containing 16.3% CP, 1.56 NEL/kg DM, 26.9% aNDFom, and 28.8% starch. The experiment was a complete randomized design with a 2-week covariate adjustment, followed by a 12-week treatment period. Pens were randomly assigned to 1 of 2 treatments: 1) Control (CO), basal diet + 354 g/cow/d of dried distillers grains (DDG), and 2) Live Yeast (YE): Basal diet + 349 g of DDG and 5 g/cow/d of live yeast. Mixes were incorporated into the TMR. Individual milk yields were recorded daily and milk composition determined weekly. Pen DMI was recorded daily. BCS and BW were determined during the covariate period and then wk 4, 8 and 12 of the treatment period. Composited milk samples by pen were analyzed for milk fatty acid profile by GC analysis. Data were analyzed with a linear model with repeated measurements using PROC Mixed of SAS, with pen as the experimental unit. The YE treatment decreased (P = 0.03) somatic cell count (SCC; 88.8 vs 61.4 cells/mL [back-transformed data], respectively CO and YE), with decreases observed at wk 1—4, 10 and 12 of experimental period (treatment by week interaction: P = 0.09), but no changes in other milk components, milk yield (49.7 vs 49.1 kg/d; P = 0.13), or DMI (28.6 vs 28.3; P = 0.57). BW and BCS were unaffected by treatment. In addition, the YE treatment tended (P = 0.07) to increase C17:0 compared with CO (0.53 vs 0.59 g/100g MFA), with no differences in any other MFA analyzed. In conclusion, supplementation with live yeast improved milk quality by decreasing SCC, even in cows with low SCC, and produced minor changes in milk fatty acid profile.

Keywords: live yeast, dairy cow, milk fatty acid.