Effects Of Yeast-Se On Digestibility, Anti-oxidation And Lactating Performance Of Dairy Cows

This experiment was conducted to investigate effects of Yeast-Se on digestibility, anti-oxidation andlactating performance of dairy cows by adding Yeast-Se into ration. This paper provides reference gist for dairyindustryandsearchforaneffectiveSeleniumsupplyapproachforhuman.Experiment ?Eight diary cows were used in 4×4 Latin square design to study the effect of Yeast-Se onnutrient apparent digestibility and blood anti-oxidation. Control group: 0.3mg Se/kg dry material as sodiumselenite;treatgroups:0.30, 0.45, 0.60mgSe/kgdrymaterialasYeast-Se.ExperimentⅡSixty healthy Holstein diary cow were assigned into 4 groups randomly according parity,DIM and milk production to research effects of Yeast-Se on lactating performance and conception rate of dairycows.Theresultshowedthat:With Yeast-Se substituted sodium selenite on dairy cow performance at 0.30 mg Se/Kg dry material (DM),there was no significant effect of yeast-Se or sodium seleniteon on DMI, energy apparent digestibility, milkproduction, milk protein, milk fat, milk glucose or dry matter content. With yeast-Se, EE, OM apparentdigestibilityswere higher (P>0.05);while CPapparentdigestibilitywas increased by14.23%(P<0.05);DNF, ADF,Ca, P, Se apparent digestibility were increased by 18.61%, 13.12%, 15.66%, 23.46% and 62.82% (P<0.01); theconcentration of blood Se, serum GSH-PX, T-AOC, SOD were improved by 20%(P<0.05), 44.12%(P<0.01),37.67%(P<0.01), 15.31%(P<0.05), while the MDA was decreased by 25.87% (P<0.05). Cows fed Yeast-Se hadhigher conception rate. Content of vitamin E and Se in milk was increased by 21.43% (P<0.05) and 68.67%(P<0.01). SCCwasdecreasedby22.76%(P<0.01)ofcowssuppliedyeast-Se.Yeast-Selevelhadnoeffectonenergy,CP,EEapparentdigestibilityandmilkfat,milkglucoseordrymattercontent, while 0.45 mg Se/Kg DM could slow up the decrease of these milk components. At 0.3 level, cow hadhighest Se apparent digestibility and anti-oxidation (P<0.01), Se concentration in blood was enhanced (P<0.05)with the increase of yeast-Se supply level. With yeast-Se 0.45 mg/Kg DM, all general nutrient apparentdigestibilitywashighestexceptSe;OM, DNF, ADF, Ca,P,Seapparentdigestibilitywere higherthanothergroups(P<0.05). CowsfedYeast-Se 0.45 mg Se/Kg had highestconception rateandconcentration of vitamin E in milk.Milk production was 4.12%, 6.36% higher than that of 0.30 and 0.60 mg Se/Kg DM (P<0.05). SCC (somatic cellcount) was decreased (P<0.01) with the increase of Yeast-Se supplemented level and feeding duration. The Seconcentrationinmilkandcattlehairwereenhanced (P<0.01)withtheincreaseofYeast-Sesupplementedlevelandfeedingduration.Therefore,withthissupplylevel,wecouldproduceSe-enrichedmilk.According to two experiments above, it is that compared with sodium selenite, yeast-Se could increase thenutrient apparent digestibility and conception rate, enhance anti-oxidation ability, improve lactating performance,especiallywith0.45mgSe/KgDM.