factors affecting on semen quality
DESCRIPTION
Factors affecting on semen quality. ผศ.น.สพ.ชัยวัฒน์ จรัสแสง ภาควิชาศัลยศาสตร์และวิทยาการสืบพันธ ุ์. ให้นักศึกษาอธิบายปัจจัยที่ทำให้เชื้ออสุจิตายมา 1 ตัวอย่าง. References. - PowerPoint PPT PresentationTRANSCRIPT
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Factors affecting on semen quality
ผศ.น.สพ. ชยัวฒัน์ จรสัแสงภาควชิาศัลยศาสตรแ์ละ
วทิยาการสบืพนัธ ุ์
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•ใหนั้กศึกษาอธบิายปัจจยัท่ีทำาใหเ้ชื้ออสจุิตายมา 1 ตัวอยา่ง
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References• Barth A.D and Waldner C.L. 2002. Factors
affecting breeding soundness classification of beef bulls examined at the Western College of Veterinary Medicine. Can Vet J 43(3):274-284
• Hafez.E.S.E and Hafez.B. 2000. Reproduction in farm animals 7 th edition. Lippincott Williams & Wilkins. 509pp
• http://vet.kku.ac.th/chaiwat/teaching/teaching2010
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Objectives• บอกสาเหตท่ีุมผีลกระทบต่อเชื้ออสจุไิด้
• สามารถอธบิายปัจจยัจากตัวสตัวต่์อคณุนำ้าภาพของเชื้อ
• สามารถชีใ้หเ้หน็ถึงอิทธพิลของสิง่แวดล้อมท่ีมผีลต่อคณุภาพนำ้าเชื้อ
• สามารถบอกถึงปัจจยัท่ีอาจมผีลต่อคณุภาพนำ้าเชื้อในขัน้ตอนการผสมเทียม
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Breeding soundness evaluation
Pedigree
Progeny test
- Long time - More costly
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Breeding soundness evaluation
Breeding Index
(USA TPI=Type production index) (Canada LPI= Lifetime profit index)
(New Zealand BV’S = Breeding values) (Japan NTP=Nippon total index)
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Terminology of semen
•PTA (ETA) : Predicted or estimated transmitting ability
•EBV : Estimated breeding value (Canada)
•PTAT : Predicted transmitting ability of type traits
•Reliability
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Factors on Semen quality
•Bulls effect•Feeding •Diseases•Semen collection management
•Environmental effects
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Bulls affecting • Age• Scrotal circumference• Breeds• Body condition score• Physical abnormalities• Frostbite ???
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Effect of Age
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Effect of Breeds
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Effect of BCS
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Effect of Physical abnormalities
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Effect of Scrotal circumference
Minimum Recommended Scrotal Circumference in Centimeters by Age for Bulls
Age (months) Scrotal Circumference (cm) 15 30>15-18 31>18-21 32>21-24 33>24 34
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Effect of scrotal frostbite
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- Puberty --> scrotal circumference
- semen
collection time- 6Bull > years- Boar > 3
years- Stallion > 20
years
Feeding on semen quality
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Feeding
R RRRRRRR R RRRRRRR( )
Young animals- -- Low energy > delay semen production- --R> less affecting- High energy ---> low libido
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Thailand
-- > Late puberty
- roughage- climates
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Low feeding
- Testosterone --> decrease- low libido- Obesity -->
low libido and sexual activity
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Vitamin A
Pituitary gonadotropins
Testicular degeneration
Vitamin E ---> Male organ
Vitamins
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Minerals
- -- Iodine > poor libido- Copper- Cobalt- Zinc- Manganese
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Toxins - -- High gossipol > epididymal cell
- radiation --> spermatogenesis
- --- estrogen feed > failure of sperm transport in the female tract
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Diseases
- Virus (IBR, BVD, FMD)
- Bacteria (Brucellosis)
- Parasite (Blood parasites)
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Semen collection management
- Training- - Frequency 1 2 per week- hoof problem
--> electro-ejaculator
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Environmental effects 1. Temperature- Motility - Temperature shock
- Heat shock- Cold shock
2 . Photoperiod & seasonLong time --> Longevity sperm
3. Oxygen ionO 2 --- > H2O2
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4. AciditypH 6.7- 6.9Sperm metabolism --> Lactic acids
---> Buffers5. Osmostic pressure
Permeabili ity 6. Metal
Lead, Mercury 7 . Bacteria 8 . Detergent&Toxin
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1. Semen collection
2. Storage and freezing
3 . Storage and transportation
4 . Thawing and insemination
Risk of environment factors
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Bulls prepare- Shower- Wash prepuce with NSS 0.9 %
Material prepare- Detergent- Sterile
Collection time- Light- Temperature
Semen collection
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Storage and freezing
1. Freezing 37 C 5 C - 20 C - 79 C -196 C
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2. Extender
- protection cold shock and cryo-protectant- Energy source- Buffering- Osmotic pressure- Bacteria inhibition
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- Extender Egg Yolk Tris
- --- Tris > buffers- -- citric acid > buffers- -- Glucose > energy, osmotic pressure- Penicillin, Streptomycin, Polymixin B- Gl -- - ycerol > cryo protectant- - -- -Egg yolk > cyro protectant
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Storage and Transport
Semen bank tank- coding- liquid nitrogen
AI center tank- liquid nitrogen--> 2 weeks
Inseminator tank- liquid nitrogen --> day by day
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Transports- Liquid nitrogen- Tank to tank
- Canister - Straw (0.25 French mini-straw
0.5 ml USA)- < 15 second- forceps
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Thawing and Insemination
Thawing- canister level- forceps- 35-40 C 30 second
AI- AI gun --> clean & dry
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AI technique
- - Sperm death 10 20 %
- Live sperm 6- 8 m. / straw
-Progressive motile drop - 515%
-Limited of bulls
-Health control
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•จะเกิดอะไรขึน้ถ้ามนี้ำ้าปนเปื้ อนในขัน้ตอนการรดีน้ำ้าเชื้อ ???
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