Study On The Effect Of Cold Stress And High Energy Diets On Serum Biochemical Indexes And Production In Laying Ducks In Cage

The experiment was conducted to study the effect of cold stress and high energy diets on the Jin-ding ducks in cage. In the experiment, 144 (40 weeks of cage) Jin-ding ducks of commercial strain were assigned to four groups randomly, in 2X2 factors. They were fed in cold temperature(4+1C)or warm temperature(19?Irrespectively. Each group was fed with the metabolizable energy content of 2.75, 2.85, 2. 75, 2. 85Mcal/kg diets containted 18.49% CP respectively.The results showed that in cold stress, feed intake and feed conversion ratio very significantly increased (P<0.05), while egg production, laying rate and average daily gain significantly declined (P<0. 05). Fed on high energy diets, feed intake and feed conversion ration declined (P <0. 05), while egg production and laying rate inclined 6. 1%, 6.4% respectively. In cold stress fed on high energy diets, feed intake and feed conversion ration declined (P <0. 05), while egg production and laying rate inclined 14.6%, 13.6% respectively.In the experiment, the levels of serum T; increased(P<0.05), while the levels of serum T4 decreased in cold stress. Fed on high energy diets, the levels of serum T3 tended to decrease , while the levels of serum T4 tended to increase . In cold temperature and warm temperature , fed on high energy diets , the levels of serum T3 tended to decrease , while the levels of serum T4 tended to increase .In cold stress , serum free fatty acid and uric acid very significantly increased (P<0. 01) , while serum glucose declined (P<0. 05) . Fed on high energy diets , serum free fatty acid and serum glucose significantly increased (P <0. 05) , while serum uric acid tended to decrease. In cold temperature and warm temperature , serum free fatty acid and serum glucose tended to increase, while serum uric acid tended to decrease .In the experiment, ME, N, Ca, P efficiency declined 6. 8%(/><0. 01), 14.2%(/p<0. 05), 21.2%, 15.5%(P<0.05) respectively in cold stress. Fed on high energy diets, ME, N, Ca, P efficiency respect ively increased 4.9%( P<0.05) 16.4%(P <0.05) 8.1%, 17.6%. In cold stress fed on high energy diets, ME, N, Ca, P efficiency increased 6.8%(P<0.05),25. 6% (P<0.05) , 46. 8%,24.7%(P<0.05), wliile in warm temperature ME, N, P efficiency respectively increased 2. 9%x 9.1%,12.0% , but Ca efficiency declined 14.7%.Master candidate: Mi Yuling Major: Animal Nutrition and Feed Science Supervisor: Prof. Wang An...