الفهرس يوجد فقط 14 صفحة متاحة للعرض العام
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المستخلص
Two different trials were carried out at the Experimental Station of the Animal Production Department, Faculty of Agriculture, University of Assiut. In the first trial 10 rams (over two years old with an average body weight of 30 kg) were used in digestibility study. At the second trial, twenty five Saidi sheep with an average age 18 months and average body weight 26.4 kg were used. Animals were divided into five groups, each of five animals (2 males and 3 females). Group 1 (T I), fed the control ration without fat supplementation, group 2 (T2), fed the control ration plus 2% saponified fat, group 3 (T3), fed the control ration plus 2% free fat, group 4 (T 4), fed the control ration plus 3% saponified fat and finally group 5 (Ts), fed the control ration plus 3% free fat. These trials were carried out to test the effect of fat supplementation on feed nutrients digestion, nitrogen balance, growth performance and some physiological parameters.
The obtained results could be summarized as follow:
1- The crude protein, and NFE digestibility decreased by adding dietary fat.
2- The nitrogen retention (g/d) decreased by adding dietary fat.
3- Addition of fat to the control diet increased ether extract and crude fiber digestibilities.
4- Fat supplementation in general, had no significant (P>O.OS) effect on NDF, ADF, Hemicellulose and ADL digestibilities. However cellulase digestibility tended to be higher in treated groups than in controle one.
S- The differences in total body weight change and dry matter intake (g/d) were not significant (P>O.OS) between the control and fat supplemented groups, but numerical differences between T4 or Ts in one side and the other treatments in the other side were obtained.
6- Dry matter required to produce one gram live body weight of the control group (T)) was higher (P<O.05) than the other treated groups (T2, T3, and T4 ).
7- Regardless of the fat levels, saponified fat was more efficient to improve feed conversion than free fat.
8- Feeding fat supplemented rations (3% only) to sheep increased significantly (P<O.05) blood serum totallipids.
9- Addition of 3% free fat to the diet increased (p<O.05) serum triglycerides concentrations.
10- Dietary fat (T 3, T 4 and T s) increased serum cholesterol concentration.
11- Feeding diet with 3% free fat increased (P<0.05) serum alkaline phosphatase concentration.
12- There were nonsignificant differences (P>O.05) in serum calcium concentration among treated groups and the control ones, except that for T 3 which had the higher value than those of other groups.
13- Dietary fat supplementation increased (p<0.05) serum phosphorus concentration. Within the treatments it is appeared that T3 and T4 had the excelled values than those ofT2 and Ts. With respect to the period, a linear sharp increase (P<O.05) in phosphorus was recorded among periods.
14- Dietary fat groups (T2, T4 and Ts) had lower (P<O.05) values of serum AL T than that of control (T 1)’ While there was no significant differences in serum AST concentrations among treatments.
15- The effect of fat source and/or levels on the rumen pH values were significant (P<O.O 1) only between the two sources of the higher fat level (T4 vs. Ts). The highest pH value was found before feeding (Time 0) which differed significantly from other sampling time.
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16- The effect of dietary fat on the NHrN concentrations in rumen Liquor, were not significant (P>O.05). The control diet showed the highest value of NH)-N concentration. Also, the lowest NH)-N concentration was found when 2% saponified fat was fed.
17- Animals fed fat-supplemented diets had higher VFA’s concentrations in their rumen liquor than those fed control diet.
18- Dietary fat supplementation had no significant effect on both rectal temperature and respiration rate of saidi sheep.