Effeat Of Different Vitamin Elevels On Antioxidant Properties,Production Performance Of Dairy Buffalo In Summer

To study the effect on physiological and oxidation resistance of dairy buffalo in summer, to explore the generative condition of heat stress in dairy buffalo, and to study the effects of the diet with different levels of vitamin E on oxidation resistance, lactation performance, milk ingredients and electrolyte in dairy buffalo in summer, following tests were conducted.Part Ⅰ:Twenty four healthy dairy buffalo were selected in a buffalo farm of Guangxi, according to the principle of2-5parities, daily milk yield is about5-10kg. In summer and autumn, the temperature, humidity and Temperature Humidity Index (THI), breathing frequency, rectal temperature and plasma TAC, GPX, MDA were determined. Results:The THI mean was85in summer, that was61in autumn. The buffalo’ rectal temperature and breathing frequency in summer are both higher than in autumn, but the difference was not significant (P>0.05). Plasma GPX, TAC concentrations were very significant lower(P<0.01), and MDA level was significant higher (P<0.05) in summer than in autumn.Part II:Fifteen dairy buffalo were selected to take a feeding test about one month in summer. The tested buffalo were divided into three groups. Ⅰ group:0IU (basic diet, N=5); Ⅱ group:1000IU (basic diet+vitamin E1000IU/(head d.), N=5); Ⅲ group:2000IU(basic diet+vitamin E2000IU/(head d.), N=5). The temperature, humidity, THI, plasma VE, TAC, GPX, MDA, milk lactose, fat, protein, SNF,TS, milk products and K+, Na+, Cl-, Ca2+were determined. In the experimental condition,1000IU/(head d.) and2000IU/(head d.) of vitamin E can improve the plasma vitamin E, TAC, GPX, and reducing MDA content in summer. In aggregate, with vitamin E2000IU/(head d.) had better effect. Vitamin E1000IU/(head d.) and2000IU/(head d.) were both be able to alleviate the buffalo lactation decrease trend in summer, but2000IU/(head d.) levels of vitamin E was more effective.1000IU/(head d.) of vitamin E could significantly improve the level of lactose content (P<0.05);2000IU/(head d.) of vitamin E could significantly improve the level of milk fat, lactose, TS(P<0.05); Two levels of vitamin E could prevent the decreases of milk protein, plasma K+, and Na+however SNF, plasma Cl-and Ca2+concentration were not significantly affected(P>0.05).