Conducted for:
Western Yeast Company 
305 W. Ash Street P.O. Box 257 Chillicothe, IL 61523-0257

August 6, 2003 to September 16, 2003 
Yeast Product Additives in Lactating, Heat-Stressed Dairy Cow Diets

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

Western Yeast Culture
2X-2-2-5 PLUS
WKU Heat Trial

Locations of Study: Western Kentucky University, Bowling Green, Kentucky

Purpose: To evaluate the effect of Western Yeast Culture 2X-2-2-5 PLUS yeast fed during heat stress conditions to lactating dairy cows

Abstract: Fourteen cows per group, paired by breed, lactation, DIM, were assigned to control or yeast groups. DHIA records were used to equally sort groups. Both groups were fed a TMR consisting of corn silage, alfalfa hay and haylage, grain mix and whole cottonseed. Cows had controlled access to alfalfa pasture for test dates 8/06 to 9/16 2003. Data was analyzed using “analysis of variance”. Milk yield and energy corrected milk were statistically higher (p=<0.05) in the Holstein YEAST group. The limited Jersey sample size did not provide adequate statistical data for analysis.

Materials and Methods: Fourteen cows per group, paired by breed, lactation, DIM, assigned control or yeast groups. Both groups were fed a ration consisting of corn silage, alfalfa hay and haylage, grain mix and whole cottonseed, cows had controlled access to alfalfa pasture for the test dates 8/06 to 9/16 2003. Cows were weighed 3 times during the trial. Body temperatures were taken at each weighing. Milk weights were captured at each milking using electronic weigh meters, which download into a computer. Butterfat and protein % were determined from DHI samples. 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. A significant difference was found at the (p=0.05) level between milk yield and ECM in the Holstein Western Yeast Culture 2X-2-2-5 PLUS yeast group. The limited Jersey sample size did not provide adequate statistical data for analysis. 

Summary: Milk yield and energy corrected milk were statistically higher (p=<0.05) in the Holstein Western Yeast Culture 2X-2-2-5 PLUS yeast group. The limited Jersey sample size did not provide adequate statistical data for analysis. 

Economic Significance: With ECM milk price at $14.00 CWT the yeast fed group had a $1.39 daily advantage in income over the control cows.

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