Publication Date


Advisor(s) - Committee Chair

Jodie Pennington

Degree Program

Department of Agriculture

Degree Type

Master of Science


Twenty three cows with an average of 2.7 lactations were used to measure the effects of different protein sources (soybean meal, soybeans, and heat-treated soybean) and supplementation with niacin on milk production, milk components (protein, fat, somatic cell counts), 4% fat corrected milk, solid corrected milk, dry matter intake, body weight changes, and rumen volatile fatty acids (acetate, propionate, butyrate).

Diets affected performance of cows. The results indicate, in general, that feeding heat-treated soybean and soybean meal to lactating dairy cows in early lactation resulted in greater milk production, milk protein, dry matter intake and less loss of body weight than these parameters in cows fed soybean. Cows fed heat-treated soybeans had greater protein percentage in the milk and milk protein yield than cows fed soybean meal; however, there was tendency for higher fat tests early in lactation when cows were fed soybean.

Also the results indicated that niacin supplementation improved milk production and dry matter intake, but did not influence milk composition.


Agriculture | Animal Sciences | Dairy Science | Life Sciences