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M. Salehi

M. Salehi. Scientific member of Animal Science Research Institute of Iran Department of Animal Science, Faculty of Agriculture, University of Kerman, Kerman, Iran Topic The effect of shearing time on wool Traits in Baluchi sheep. The effect of shearing time on wool Traits in Baluchi sheep.

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M. Salehi

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  1. M. Salehi • Scientific member of Animal Science Research Institute of Iran • Department of Animal Science, Faculty of Agriculture, University of Kerman, Kerman, Iran Topic The effect of shearing time on wool Traits in Baluchi sheep

  2. The effect of shearing time on wool Traits in Baluchi sheep M. Salehi and M. Asadi Fozi Scientific member of Animal Science Research Institute of Iran and Department of Animal Science, Faculty of Agriculture, University of Kerman, Kerman, Iran

  3. Introduction

  4. WOOL SUPPLY SITUATION • Total fibres: 37.8 million tons • 56 % Artificial and 54 % Natural fibers • 89.5% plant fibers, 0.03% Silk and 10.47% animal fibers • 9.45% Wool ( Wool represents less than 5 percent of the world consumption of fibers), 0.09 % Mohair, 0.0225 % Cashmere, 0.01245 % Alpaca and 0.0015 % Camel hair

  5. There are 2.034277 million tons of wool that produce by more than 1000 million head of sheep with different breeds

  6. which classified as follows Fine wools Medium Wools Crossbred wools Coarse and long wools Carpet wool A: Improved Carpet wool B: Unimproved Carpet wool Or Mixed

  7. Fibre Content Identification &‌Main factors influence the wool price 1- Color 2 - Diameter (MFD) 3 - Mean fibre length (MFL) 4 - Medullation 5 - Cuticle or scale

  8. Pigmentation and Color The most value belongs to white color but there are a wide range of Color between Unimproved wool sheep

  9. Merino Sheep Fine wool

  10. Diameter 17-23 micron (60s and finer) Staple length (5 -10 cm)

  11. Medium Wools Or Crossbred wools Diameter 23 – 26 micron (56 - 60s ) Staple length (5 -10 cm) Correidale

  12. Coarse and long wools Diameter 30 -43 micron (36 - 50s ) Staple length (15 -37 cm)

  13. Border Leicester

  14. Lincoln

  15. New Zealand Romney Marsh That they are actually crossbred from long wool breed with another breeds Improved Carpet wool sheep

  16. Improved Carpet wool sheep

  17. Unimproved Carpet wool sheep

  18. Medullation The other important difference between improved and unimproved wool are ratio and type of medullation in fleece and scale pattern of fibers

  19. Cuticle or scale

  20. Fine and medium and crossbred wools Improved carpet wools Unimproved or native carpet wools

  21. Cross Section of unimproved carpet wool

  22. Type of medullation and characters in native carpet wool Continuous (40-60 micron) True wool (18- 40 micron) Interrupted and Fragmental (30-45 micron) Kemp fibers (90-130 micron)

  23. Comparison between different type of carpet wool

  24. Literature review Average fibre diameter (MFD) and its variation (CV) also staple strength (SS) are important raw wool characteristics that greatly influence wool processing properties such as the length of fibres (Hauteur and Barbe).

  25. Literature review Staple strength (SS) appears to be related to minimum fibre diameter (FD) along the staple, although there is some evidence that the rate of change in fibre diameter (FD) may also be involved.

  26. Therefore CV of fibre diameter (FD) is usually used as a criterion for staple strength (SS) in wool sheep breeding program (Safari et al. 2005).

  27. Seasonal wool production appears to be largely responsible for variation in staple strength (SS), mean fibre diameter (MFD) and it's CV. The lowest wool production tends to occur in autumn and winter growth in almost all sheep that rearing in tropics regions and to be sever with lambing. (Butler and Head, 1992 & Henderson, 1967).

  28. Since the shape of the fibre depends on where it is cut at shearing, one strategy is to aim to shear at weakest point in fibre. There is considerable evidence that shearing ewes just prior to lambing is a useful means in staple strength (Arnold et al. 1984)

  29. According to Summer (1994) report, clean fleece weight of twice shorn was greater than of once – shorn ewes and mean staple length (SL) of the fleece reflected the interval between shearing and seasonal wool growth.

  30. Autumn shearing may be associated with a vegetable matter fault and it could result in a bigger financial loss than that due to reduction in mean fibre length (MFL) due to tenderness (Lock, 1994).

  31. Also once - shorn wool was more discoloured than twice – shorn wool. Average net wool returns were greater for once – shorn than for twice – shorn ewes (Summer, 1994).

  32. Records on 9535 shearing ofBharat Merino sheep indicated that sir, period of shearing, age, season of shearing and period of birth all had significant effects on greasy fleece yield (Tomar, 2000).

  33. OBJECTIVE OF STUDY The main objective of this study were: the effect of the number of shearing on the fleece traits in Baluchi sheep.

  34. Iran population sheep's are over 50 millions heads and approximately 65 million kg grease wool or 30 – 33 million kg clean wool have been produced Baluch sheep breed content 19% of Iran population sheep's

  35. Baluchi sheep (pure & crossbreed) reared in central and eastern parts of Iran under different altitude and weather with diverse conditions

  36. Baluchi sheep have white wool but black patches on face, around the eyes, ears, lower legs and hands

  37. Collecting Usually is shorn twice per year; in spring and late summer while some breeders sheared their flocks only once per year.

  38. MATERIAL AND METHODS Animals: Abas Abad sheep station which is situated in Khorasan in North of Iran is used for supporting research on Baluchi sheep. (In this station some economic traits such as bodyweight and fleece are measured annually).

  39. The animals were divided into two groups having the same management. The first group was shorn only once per year in spring while the second group was shorn twice, in spring and late summer.

  40. But fleece samples were taken from the animals in both groups twice per year i.e. in spring when both group were shorn and in late summer when only second group was shorn. The experiment was implemented for two years.

  41. Sampling: The fiber samples (20 gram) were taken from right mid-side of 52 Baluchi sheep.

  42. Before shearing the staple lengths of the shoulder, flank and rump had been determined

  43. MFCD & CVFD The fibers was prepared and cut for measurement fiber diameter with the projection microscope (ASTM D2130-78)

  44. The sub sample was paralleled in fibro liner to determine the Simi rigid length in Almeter (Hauteur and Barbe length items)

  45. A number of fibres so that, a specimen of 15 to 25 mg is available for testing was prepared.

  46. The clamped tuft were placed in the grips of tensile testing machine (Instron) and used 1 N capacity load cell with the pulling clamps moved at 25 cm/m. Breaking tenacity calculated (ASTM.D-1294 ).

  47. DATA ANALYSES The repeated measurement and general liner model (GLM) was used for the analysis using SAS software package (SAS / STAT User’s Guide, 1987).

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