Effect of yeast (Saccharomyces cerevisiae) on rumen function, blood components and rectal temperature of lactating Holstein dairy cows.
2004
Dehghan-Banadaky, M. | Nikkhah, A.
An experiment was conducted to evaluate the effects of different levels of yeast (Saccharomyces cerevisiae SC47) on productive performance of Holstein dairy cows. In this experiment a balanced change-over design with twelve cows (in early lactation stage), four rations (1-4), three eriods (28 days per period), three blocks and four cows per block were employed. Ingredients of the basal diet were alfalfa hay (23.65%), corn silage (17.2%) and concentrate (59.15%) on dry matter basis. The experimental diets 1 to 4 contained 0, 3, 6 and 12 grams of yeast per day, respectively. The rations were fed to cows as total mixed ration (TMR), but yeast was top-dressed on the p.m allotment of ration. The cows were fed individually ad libitum and milked three times per day. Daily milk yield was recorded and samples of the milk were taken twice per week for determination of milk composition, also samples of rumen liquors and blood were taken in end of each period. In thid experiment DMI, body weight change and milk yield of cows were not affected by experimental diets. But milk composition including fat, SNF and total solid % were increased by yeast culture (p less than 0.05). The concentration of milk lactose and protein was not affected by using yeast culture (p more than 0.05). The averages of fat corrected milk yield for 3.2% fat with respect to the rations 1-4, 33.25, 30.92, 33.48 and 33.55, for 3.5% fat 31.61, 29.35, 31.81 and 31.9 and for 4% fat 29.29, 27.25, 29.47 and 29.53 were calculated. The difference between averages of the milk was not significant. The rectal temperature and pH of cow`s rumen liquor was not significantly different. Also concentration of glucose, Ca, P, Na, cholesterol, triglycerides, urea-N and total proein in plasma of cows received different diets were not different (p more than 0.05) but concentration of K (p=0.046) and Mg (p=0.049) in plasma of cows received diet 2-4 were lower than control group and were statistically significant.
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