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العنوان
Effect of adding some protected amino acids on some wool characteristics in barki sheep /
المؤلف
Abo El-Naga, Alaa Hamada Youssef Hamad.
هيئة الاعداد
باحث / آلاء حمادة يوسف حماد أبوالنجا
مشرف / مصطفي عبدالحليم الحرايري
مشرف / وائل أحمد خليل رزق
مشرف / وائل أحمد محمد رمضان
مناقش / أحمد هلال محمود يوسف
مناقش / عبدالخالق السيد عبدالخالق
الموضوع
Amino acids in animal nutrition. Amino acids. Feeds. Proteins in animal nutrition.
تاريخ النشر
2017.
عدد الصفحات
p 71. :
اللغة
الإنجليزية
الدرجة
ماجستير
التخصص
علم الحيوان والطب البيطري
تاريخ الإجازة
01/04/2018
مكان الإجازة
جامعة المنصورة - كلية الزراعة - Animal Production
الفهرس
Only 14 pages are availabe for public view

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from 71

Abstract

The present study was conducted at Maryout Research Station of the Desert Research Center, located 35-km south-west of Alexandria, in cooperation with the Department of Animal Production, Faculty of Agriculture, Mansoura University. Twenty four adult Barki ewes were used to investigate the effect of addition of rumen protected amino acids, lysine or/and methionine on some wool characteristics. This study was carried out from September 2016 to February 2017. Animals were divided into four groups (6ewes/group). The first group (Control): fed only the control diet, second group (LYS): fed the control diet and rumen protected lysine (6g Lysi pearl /kg concentrate, 3g /animal/day), third group (MET): fed the control diet and rumen protected methionine (14g Smartamin/kg concentrate, 7g /animal/day) and fourth group (LYS+MET): fed the control diet and mixture of (3g LYS and 7g MET/animal/day) for six months. Animals were fed on Berseem hay (Trifolium alexandrinum), offered and libitum plus concentrate mixture (at a rate of ½ kg/head/day) (14%CP and 60%TDN) which was composed of cottonseed cake 50%, wheat bran 18%, yellow corn 15%, rice polish 11%, molasses 3%, limestone 2% and common salt, 1%). Water was provided twice daily. Wool samples were harvested from the left mid-side position of each ewe three times at September (time 0), December (after 3 months) and February (after 6 months) and used to investigate some of wool measurements such as fiber diameter, fiber length, staple length, fiber length rate, staple strength, elongation, point of break, clean wool yield and wool component of amino acids. The blood samples were collected for each animal at the end of the experiment to determine plasma component of amino acids. The results of the present study could be summarized as follows : 1.Fiber length: Results showed that fiber length significantly increased by supplementing methionine, lysine and mixture of methionine and lysine compared with control. Furthermore, the fiber length was higher in all treatments after 6 months compared with 3 months of experiment. 2.Fiber length rate: Supplementing methionine, lysine and mixture of methionine and lysine caused significant increasing in fibre length rate compared with control. 3. and lysine or lysine showed significant increase in wool staple length compared with control. However, addition of methionine showed insignificant increase in wool staple length compared with control. The wool staple length increased with increased the time of treatment. 4.Fiber diameter: Addition of protected amino acids tended to make a slight increase in fiber diameter especially with lysine and lysine with methionine compared with control group. Also, Supplementation of methionine leads to significant increase in fiber diameter compared with other groups. Fiber diameter of wool increased by increasing the time of treatment. 5. Clean wool yield: Addition of methionine resulted significantly in higher percentage of clean wool yield, whereas addition of lysine had insignificantly lower percentage of clean wool yield. The percentage of clean wool yield increased with increased the time of treatment. 6. Staple strength: Staple strength increased significantly by adding methionine or lysine and methionine compared with control. Whereas, addition of lysine did not cause significant effect on staple strength. Staple strength of wool increased by increasing the time of treatment. 7. Point of break: Addition of methionine or lysine showed significant increase in wool point of break compared with control. However, addition of lysine and methionine showed insignificant increase in wool point of break compared with control. Point of break of wool didn’t influence significantly by increasing the time of treatment. 8. Elongation: Addition of lysine and methionine or methionine or lysine showed insignificant increase in elongation of wool compared with control. The elongation of wool increased with increased the time of treatment. 9. Wool content of amino acids: Adding protected amino acids lysine or/and methionine caused a significant increase in lysine, serine, glutamic acid and tyrosine, while it caused significant decrease in methionine, glycine, valine, leucine, proline and ammonia compared to the control group. 10. Plasma content of amino acids: Adding protected amino acids lysine or/and methionine caused a significant increase in lysine, glutamic acid and arginine concentrations, while it caused significant decrease in proline and ammonia concentrations. Also, it has been observed that adding rumen protected lysine caused a significant decrease in leucine concentration, but adding rumen protected amino acids methionine and mixture of lysine and methionine caused insignificant decrease in leucine concentration. CONCLUSION In conclusion, addition of protected methionine (7g Smartamin/head/day) for 6 months enhanced significantly wool characteristics of Barki ewes (fiber length, fiber diameter, staple strength and clean wool yield). This has created a great necessity to make studies for improving the quality of wool produced locally to standardize the manufacturing needs to produce woolen textiles satisfying the consumer’s taste and decreasing the imported expensive wool.