Effect Of Adding Amounts Of Soybean Oil On Growth Performance Of Weanling Pigs

Seventy-two health crossbred weanling pigs(DurocxLandracexLarge Yorshire),with same ages and average initial body weight,and the same amounts of male and female,wlich were weaned on the days of 34? and then were assigned to four dietary treatments according to completely randomly individual factorial design.Each treatment has three repeats.The control group was fed as uaual feeding level.Grease were added at the ratio of 0.6% 4% and5.5% respectively to the trial groups of 1, 2, 3, on the base of which different ratios of 14.2% 12.8%, 12.6% 12.5%g/MJ of protein and energy were designed for control group and the trial groups of 1, 2, 3The results showed that:1.Growth performance: During the phase 1(0 to 2 weeks),there was no significant different of each indexAverage daily gain(ADG) Average daily feed intake(ADFI) feed conversion ratio (FCR) were increased with the increasement of grease.The trial group with 4% grease was highest among of them.Therefore,adding grease has no effect on the growth performance of piglets on the 0 to 2 weeks after weaned.During the phase 2(2 to 4 weeks),each index all have changes as second gear curve with the increasement of grease .Among of dl the treatments,the group with 4% grease was best,ADG and ADFI of which were significantly higher than that of the treatments with 0% 0.6% 5.5%of grease(P<0.05),and FCR is higher than them.In conclusion,ADG and ADFI have the secong gear curve changes on the 0 to 4 weeks,and the treatment with 4% of grease was significantly higher than that of othergroups(P<0.05).ADG of the treatment with 4% of grease was improved 26.2% 20.4%and 19.8% than the treatments with 0% 0.6%and 5.5% of grease.So we can have the conclusion:adding too high ratio(5.5%) of grease to the diet,each index of growth performance would be graded.2. Diarrhea rate: Diarrhea rate of the first treatment and second treatment were lower than control group, but the third group was higher than control group; Diarrhea rate of the second group (4% of grease)was the lowest.3. One piglet was randomly selected from each repeat to appraise the activity of pancreas fat enzyme and enteron fat enzyme. The results showed that the activity of fat enzyme had no significant difference among the treatments(P>0.05). At implied that soybean oil had no significant influence on the activity of fat enzyme after four weeks. The actioity of fat enzyme of 4% soybean oil treatment was highest.