Small Ruminant Reproductive Management Workshop

Transcription

1 Small Ruminant Reproductive Management Workshop Animal Nutrition and Physiology Center, North Dakota State University Sponsors: American Sheep and Goat Center, North Dakota State University, University of Wisconsin-River Falls

2 Workshop Schedule Wednesday, Nov. 10 Thursday, Nov. 11 Friday, Nov Reproduction Review - Semen Collection Evaluation & Storage - Embryo Collection and Transfer - Laparoscopic AI - Pregnancy Diagnosis & Fetal Aging, Sexing and Counting - Development of Teaser Rams

3 Specific Objectives 1. Reproductive anatomy 2. Hormonal control of reproduction 3. Hormonal products for managing reproduction 4. Reproductive management techniques

4 Male Reproductive Anatomy Testes Male Reproductive Tract Male gonad Site of sperm production Site of testosterone production Vas Deferens Epididymis Accessory Sex Glands Sigmoid Flexure Retractor Penis Muscle Scrotum Penis Testicle

5 Male Reproductive Anatomy Epididymis Connects the testicle to the vas deferens Male Reproductive Tract Accessory Sex Glands Consists of: Head Body Tail Vas Deferens Epididymis Sigmoid Flexure Retractor Penis Muscle Scrotum Testicle Penis

6 Male Reproductive Anatomy Epididymis Connects the testicle to the vas deferens Male Reproductive Tract Accessory Sex Glands Responsible for sperm cell: Storage Maturation Increase in concentration Vas Deferens Epididymis Sigmoid Flexure Retractor Penis Muscle Scrotum Testicle Penis

7 Male Reproductive Anatomy Scrotum Male Reproductive Tract Protective covering of the testicle Aids in temperature regulation Vas Deferens Epididymis Accessory Sex Glands Sigmoid Flexure Retractor Penis Muscle Scrotum Penis Testicle

8 Male Reproductive Anatomy Vas Deferens Connects epididymis to the accessory sex glands Male Reproductive Tract Accessory Sex Glands Portion is removed during a vasectomy Vas Deferens Epididymis Sigmoid Flexure Retractor Penis Muscle Scrotum Penis Testicle

9 Male Reproductive Anatomy Sex Glands Male Reproductive Tract Secrete buffers, energy sources, and contribute to semen volume Accessory sex glands: Ampulla Prostate Seminal vesicles Bulbourethral glands Epididymis Accessory Sex Glands Sigmoid Flexure Retractor Penis Muscle Scrotum Testicle Penis

10 Male Reproductive Anatomy Sigmoid Flexure Male Reproductive Tract Muscle Straightens during an erection Epididymis Accessory Sex Glands Sigmoid Flexure Retractor Penis Muscle Scrotum Testicle Penis

11 Male Reproductive Anatomy Retractor Penis Muscle Male Reproductive Tract Muscle Relaxes during an erection Epididymis Accessory Sex Glands Sigmoid Flexure Retractor Penis Muscle Scrotum Testicle Penis

12 Male Reproductive Anatomy Penis Copulatory organ Male Reproductive Tract Accessory Sex Glands Sigmoid Flexure Retractor Penis Muscle Scrotum Penis Fibroelastic Testicle

13 Ejaculate Characteristics Semen Standards Motility 50-70% Morphology 90% Volume ml Concentration 2 to 4 billion per ml White blood cells <5%

14 Semen Collection & Evaluation Collection Methods Semen characteristics in bucks collected by artificial vagina (AV) or electro ejaculator (EE)

15 Semen Collection & Evaluation Techniques for determining sperm cell concentration in the semen Visual appraisal Thick, chalky appearance indicates high concentration Spectrophotometer Calibrated using a standard curve and comparing sample Hemocytometer Glass slide with precision grid etched within

16 Semen Collection & Evaluation Techniques for determining sperm cell concentration in the semen Hemocytometer 1.Sub-Sample Dilution (1:200) 2.Place sample on hemocytometer 3.Count sperm cells in 5 squares 4.Multiply Step 3 by 5 = cells/0.1 mm 3 5.Use the following equation to determine concentration (cells/ml) Sperm cells/ml = cells/0.1mm 3 X 10 X Dil Rate (200) X 1000

17 Semen Collection & Evaluation Techniques for determining sperm cell concentration in the semen Hemocytometer Example 112 cells/5 squares 560 cells/0.1mm 3 ( i.e. 112 X 5) 1.12 billion cells/ml= 560 cells/0.1mm 3 X 10 X Dil Rate (200) X 1000

18 Semen Collection & Evaluation Determining the number of units from a collection: 2 ml ejaculate collected from a ram 70% Progressive Motility 1.12 X 10 9 Cells/mL 1. Adjust for motility 1.12 X 10 9 Cells/mL X 0.70 = X 10 9 Motile Cells/mL 2. Determine total number of motile cells in ejaculate X 10 9 Motile Cells/mL X 2 = 1.57 X 10 9 Motile Cells 3. Determine number of units (if we need 40 X 10 6 Motile Cells/Unit) 1.57 X 10 9 Motile Cells / 40 X 10 6 = 39.2 Units

19 Reproductive Anatomy Vulva Female Reproductive Tract External genitalia Provides opening to the vagina

20 Reproductive Anatomy Vagina Female Reproductive Tract Between vulva and cervix Site of semen deposition during natural mating

21 Reproductive Anatomy Cervix Female Reproductive Tract Between vagina and uterine body Consists of dense connective tissue and several folds

22 Reproductive Anatomy Uterus Female Reproductive Tract Between cervix and oviducts Body and two horns Caruncles

23 Reproductive Anatomy Oviduct Female Reproductive Tract Between uterine horns and ovary Where sperm meets the egg(s) Site of fertilization X

24 Reproductive Anatomy Ovary Female Reproductive Tract Primary sex organs 1. Egg(s) 2. Hormones - Progesterone Corpus luteum

25 Reproductive Anatomy Ovary Female Reproductive Tract Primary sex organs 1. Egg(s) 2. Hormones - Progesterone - Estrogen Follicles

26 Reproductive Anatomy Ovary Brain Hypothalamus COMMUNICATE VIA HORMONES Pituitary

27 Reproductive Anatomy Ovary Brain Hypothalamus COMMUNICATE VIA HORMONES Pituitary Brain produces two hormones: Follicle Stimulating Hormone Luteinizing Hormone

28 Specific Objectives 1. Reproductive anatomy 2. Hormonal control of reproduction 3. Hormonal products for managing reproduction 4. Artificial insemination techniques

29 Reproductive Anatomy Ovary Brain Follicles Estrogen Follicle Stimulating Hormone

30 Reproductive Anatomy Ovary Brain Follicles Estrogen Ovulation of Eggs for Fertilization Luteinizing Hormone

31 Reproductive Anatomy Ovary Brain Corpus Luteum Progesterone Ovulation Fertilization of Eggs of for Eggs Fertilization Occurs Progesterone stays until kids/lambs are born!

32 Reproductive Anatomy Ovary Brain Prostaglandin Corpus removes Luteum Corpus Luteum X X Progesterone X X X Fertilization Ovulation of of Eggs Eggs for Does Fertilization Not Occur Females uterus will release prostaglandin

33 Reproductive Anatomy Ovary Brain Follicles Estrogen This process is responsible for controlling the estrous cycle Follicle Stimulating Hormone

34 Estrous Cycle Repetitious cycle of events that occurs in healthy, non-pregnant females during the normal breeding season Interval from one estrus or heat to another Table: Characteristics of the goat estrous cycle Average Range Cycle length (d) Duration of estrus (hrs) Ovulation shortly after estrus

35 Estrous Cycle Repetitious cycle of events that occurs in healthy, non-pregnant females during the normal breeding season Interval from one estrus or heat to another Table: Characteristics of the sheep estrous cycle Average Range Cycle length (d) Duration of estrus (hrs) Ovulation shortly after estrus

36 Estrous Cycle in the Doe Day of the estrous cycle

37 Estrous Cycle in the Doe Day of the estrous cycle

38 Estrous Cycle in the Doe Day of the estrous cycle

39 Specific Objectives 1. Reproductive anatomy 2. Hormonal control of reproduction 3. Hormonal products for managing reproduction 4. Artificial insemination techniques

40 Estrous Synchronization Basis for artificial insemination Brings does into estrus at a single time for insemination

41 Estrous Synchronization We use the same products that are naturally present during the estrous cycle in the doe Day of the estrous cycle

42 Estrous Synchronization What products can we use? 1. Progestagens - Actions of progesterone 2. Gonadotropins - Actions of FSH 3. Prostaglandin - Regress the CL and decrease progesterone

43 Estrous Synchronization What products can we use? 1. Progestagens - Actions of progesterone Controlled Internal Drug Release (CIDR) Device 2. Gonadotropins - Actions of FSH 3. Prostaglandin - Regress the CL and decrease progesterone Goat CIDR Inserter

44 Estrous Synchronization What products can we use? 1. Progestagens - Actions of progesterone 2. Gonadotropins - Actions of FSH 3. Prostaglandin - Regress the CL and decrease progesterone Sponges and Other Progestagen Devices Chronogest Sponge Device made from cattle CIDRs

45 Estrous Synchronization What products can we use? 1. Progestagens - Actions of progesterone Progestagen Protocol 2. Gonadotropins - Actions of FSH Insert CIDR Pull CIDR Doe in Estrus 3. Prostaglandin - Regress the CL and decrease progesterone Day of Treatment Cost: $5/female

46 Estrous Synchronization What products can we use? 1. Progestagens - Actions of progesterone 2. Gonadotropins - Actions of FSH 3. Prostaglandin - Regress the CL and decrease progesterone

47 Estrous Synchronization What products can we use? 1. Progestagens - Actions of progesterone 2. Gonadotropins - Actions of FSH 3. Prostaglandin - Regress the CL and decrease progesterone P.G. 600 or PMSG Commercially Available Not Available in the U.S. 5 ml dose: IU PMSG IU hcg

48 Estrous Synchronization What products can we use? 1. Progestagens - Actions of progesterone 2. Gonadotropins - Actions of FSH 3. Prostaglandin - Regress the CL and decrease progesterone Progestagen & P.G. 600 Protocol Insert CIDR Pull CIDR & Inject PG Day of Treatment Cost: $10 Doe in Estrus

49 Estrous Synchronization What products can we use? 1. Progestagens - Actions of progesterone 2. Gonadotropins - Actions of FSH 3. Prostaglandin - Regress the CL and decrease progesterone

50 Estrous Synchronization What products can we use? 1. Progestagens - Actions of progesterone 2. Gonadotropins - Actions of FSH 3. Prostaglandin - Regress the CL and decrease progesterone Prostaglandin Products Inject 2 ml (im) Effective when corpus luteum is present Two injections are necessary

51 Estrous Synchronization What products can we use? 1. Progestagens - Actions of progesterone Prostaglandin Protocol 2. Gonadotropins - Actions of FSH Inject PGF2 Inject PGF2 Doe in Estrus 3. Prostaglandin - Regress the CL and decrease progesterone Day of Treatment Cost: $3.00

52 Specific Objectives 1. Reproductive anatomy 2. Hormonal control of reproduction 3. Hormonal products for managing reproduction 4. Artificial insemination techniques

53 Artificial Insemination What methods can we use? Laparoscopic AI Cervical AI

54 Artificial Insemination What methods can we use? Laparoscopic AI

55 Artificial Insemination When do we perform Laparoscopic AI? Insert CIDR Pull CIDR & Inject PG600 Perform Laparoscopic AI h Day of Treatment

56 Artificial Insemination Superovulation Protocol for LAI Insert CIDR 5 mg FSH (a.m. & p.m.) 4 mg FSH (a.m. & p.m.) Pull CIDR a.m. 3 mg FSH (a.m. & p.m.) LAI h Day of Treatment

57 Artificial Insemination How do we perform cervical AI? AI Gun Speculum

58 Artificial Insemination What factors influence success? Degree of Cervical Penetration in 53 Does: Intra-uterine 10 Intra-cervical 7 Cervical os 31 Vagina 5 Pregnancy Rate to AI with Fresh Semen Intra-uterine Intra-cervical Cervical os Vagina does pregnant, % Wildeus & Collins, 2003

59 Fresh Frozen Thawed Artificial Insemination What factors influence success? Pregnancy Rate to AI with Fresh versus Frozen Thawed Semen No Cervical Penetration Cervical Penetration does pregnant, %

60 Artificial Insemination What factors influence success? Other Factors Technical Experience Seasonality Age Nutritional Management Stress