| The experiment was taken up two steps. To study the effect of adding alfalfa meal on fattening, slaughter performance and nitrogen deposition in the muscle, twenty four F1lamb (Dorper X Local mogolia sheep) were studied in the experiment Ⅰ, and then, to study the effect of adding linseed (0%,5%,10%and15%) on fattening, slaughter performance and PUFA composition in different tissues, twenty four F1lamb were studied in the experiment Ⅱ1Effect of adding alfalfa meal on lamb fattening, slaughter performance and muscle nitrogen depositionThere were no significant difference(p>0.05) with treatments in body weight and the gain weight per day during sixty days, however the gain weight of treatment Ⅳ(17.65Kg) had a little higher than the other treatments. The net meat weight, the ratio of net meat weight and the ratio of naked body meat of all treatments had no significant difference (p>0.05), and also the ratio of meat/bone, the value of GR and the area of muscular. The weight of carcass yield and the dressing percentage of the treatment Ⅳ had a significant increase (P<0.05) as compared with the other treatments. There were no significant difference (p>0.05) among the other three treatments. It was showed that the fastest ratio of growth in the third period and lowest in the fifth period (p>0.05).There was a slightly (p>0.05) decrease on the digestibility of CP with the increase of alfalfa meal addition. The CP digestibility of treatment Ⅰ and treatment Ⅱ was significantly higher (p<0.05) than treatment IV, however no significant difference (p>0.05) between treatment Ⅱ and treatment Ⅲ. The digetibitily of DM had an increase with the lamp growing (p>0.05). In the different periods, the digestibility of DM had no significant (p>0.05) difference in the first and the sixth periods; the DM digestibility of treatment IV was significant higher (p<0.05) than the treatment Ⅰ from the second and fifth periods, treatment Ⅰand treatment Ⅲ had no significant difference (p>0.05) and and also Ⅱ and the other treatments. The digestbility of NDF had adverse results to the digestibility of CP (p>0.05). The digetibitily of NDF had decreased with the lamp growing. The NDF digestibility of treatment IV had significantly higher (p<0.05) than the treatment Ⅰ and treatment Ⅱ, and had no significant difference (p>0.05) to treatment Ⅲ in the third periods.The protein level of muscle had no difference (p>0.05) in different tissues and all was above22%. The nitrogen deposition rate of treatment Ⅱ was21.25%and it was the highest of all treatments; the rate of treatment Ⅲ was20.99%. The rate of treatment Ⅱ and treatment Ⅲ was significant (p<0.05) higher than the treatment Ⅰ (17.84%) and treatment Ⅳ (17.39%).When alfalfa meal addition was in40.0%-47.5%, there was the best effect on lamb fattening, slaughter performance and nitrogen deposition in the muscle.2Effect of adding linseed on lamb fattening, slaughter performance and FA composition in the muscle of different tissues with different treatmentsAll body weight gain and ended weight had no significant (p>0.05) difference in different periods, the treatment Ⅰ and treatment Ⅲ had slightly higher than treatment Ⅱ and treatment Ⅳ. The net body weight and the ratio of net meat had no significant (p>0.05) difference and also the ratio of net meat weight/bone weight, the value of GR and area of muscular apparatus. The net meat weight of treatment Ⅲ was significantly higher (p<0.05) than Ⅱ, there was no significant (p>0.05) difference among treatment Ⅰ, Ⅲ, and Ⅳ, and also between treatment Ⅱ, Ⅰ and Ⅳ. The lamp had the fastest ratio (2.71kg/10d) of growth rate during the second phase.There was no significant (p>0.05) difference on the digestibility of DM of the lamb of four treatments.The treatment Ⅰ had a little higher digestibility than the other three treaments (p>0.05).And also the digestibility of CP. The digestibility of EE, treatment Ⅱ, treatment Ⅲ and treatment Ⅳ was higher than the treatment Ⅰ; and in the three of treatment Ⅱ, Ⅲ and Ⅳ. the treatment Ⅲ was the highest. The digestibility of EE of first30days had a little lower than the second30days. The digestibility of NDF tended to decrease with adding the amount of linseed in dietry, and the control was highest than the other three treatments.The FA composition of muscle in different tissues was SFA and MUFA, which was90percent to the total FA, and PUFA only had10%. The SFA mainly contained C16:0and C18:0; the MUFA mainly contained C18:1and PUFA mainly contained C18:2and C18:3. The results shew, the compostion structure of diferent muscle tissues were not changed by linseed. However, PUFA, CLA and n-6/n-3PUFA of added10%linseed, was better for human health. |
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