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August 28, 2003 to January
3, 2004
Effects of Pre-
and Post-Partum Yeast Feeding on Early Lactation Milk
Production
Principal Investigator
Jenks Britt BS, DVM, DABVP
Department of Agriculture
Western Kentucky University
Co-Investigator
John Tako BS, MS
Dairy Herd Manager
Department of Agriculture
Western Kentucky University
Graduate Assistant
Fabian Y Bernal BS
Department of Agriculture
Western Kentucky University
Statistical Consultant
Elmer Gray BS,MS,PhD
Dean Graduate Study
Department of Agriculture
Western Kentucky University
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Western Yeast
Culture
2X-2-2-5 PLUS
WKU Transition Trial
Locations of Study: Western Kentucky University, Bowling Green, Kentucky
Purpose: To evaluate the effect on milk yield of Western Yeast Culture 2X-2-2-5
PLUS fed during transition to prepartum and postpartum cows.
Abstract: Six cows per group paired by breed (Jersey and Holstein), lactation number and days in milk were assigned to the “yeast” or “no yeast group”. Both groups were fed
prepartum and lactating TMRs consisting of corn silage, alfalfa hay and haylage, grain mix, whole cottonseed and controlled access to alfalfa pasture. Daily milk yield was recorded and DHI samples were tested for protein and fat %.
Materials and Methods: Six cows per group paired by breed (Jersey and Holstein), lactation number and date of calving were fed
prepartum and lactating TMRs consisting of corn silage, alfalfa hay and haylage, grain mix, whole cottonseed and controlled access to alfalfa pasture. Cows were assigned to Control (no yeast) or Research (2oz
2X-2-2-5 Plus Western Yeast Culture) group. Milk yield, fat and protein % were recorded for the first 60 days of lactation on each animal. Data was analyzed using
S.P.S.S.-13© software
Statistical Analysis: Using S.P.S.S.-13© software, data was analyzed by the analysis of variance and a separation of means by a t-Test. Milk yield and energy corrected milk were not statistically different in Holsteins and controls (p=0.22) and (p=0.17), but were statistically different in Jerseys and controls (p=<0.05) and (p=<0.05), group.
Summary: Milk yield and ECM were statistically higher in the Jersey’s versus the controls, but not the Holsteins versus the controls even though the ECM for yeast fed Holsteins was 72.37
lbs. per day and the controls 66.79 lbs. day.
Economic Significance: With ECM milk price at $14.00 CWT the yeast fed Jersey group had ECM of 66.28
lbs. daily and the controls had ECM of 49.4 lbs. daily. At $14 CWT the yeast group had a $2.36 per day advantage over the controls.
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60
Days Analysis
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Animal Performance
Holsteins
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Control
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Western Yeast
Culture
2X-2-2-5 PLUS
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Average Milk Yield (lb)
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66.18
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71.13
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0.0366
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0.0380
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Average butterfat%
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3.66
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3.80
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Average butterfat (lb)
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2.42
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2.70
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0.0304
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0.0290
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Average protein %
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3.04
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2.90
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Average protein lb
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2.01
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2.06
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3.5%FCM
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67.87
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74.56
(+6.69)
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Fat & Protein Corrected milk (lb)
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66.79
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72.37
(+5.58)
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60 Days Analysis
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Animal Performance
Jersey
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Control
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Western Yeast
2X-2-2-5 PLUS
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Average Milk Yield (lb)
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43.90
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58.30
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0.0420
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0.0440
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Average butterfat%
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4.20
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4.40
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Average butterfat (lb)
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1.84
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2.57
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0.0370
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0.0350
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Average protein %
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3.70
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3.50
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Average protein lb
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1.62
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2.04
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3.5%FCM
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48.86
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66.78
(+17.92)
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Fat & Protein Corrected milk (lb)
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49.40
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66.28
(+16.88)
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