Reprod PhysEndocrin ANS 3319
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This 5 page Class Notes was uploaded by Laury Kreiger on Friday September 18, 2015. The Class Notes belongs to ANS 3319 at University of Florida taught by Staff in Fall. Since its upload, it has received 27 views. For similar materials see /class/206673/ans-3319-university-of-florida in Animal Science at University of Florida.
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Date Created: 09/18/15
PowerPoint 24 Notes Estrous Synchronization I Why Synchronize A Shorter breeding period B Shorter breeding period results in increased weaning weights of calves because they are older C More uniform calf crop D Replacement heifers will be older more likely to be cycling II PGF2 alpha Control of Cycle A Regresses the CL CL is required for it to be effective B Products Lutalyse Estrumate ProstaMate Boviline Boviline is long lasting in oil and is used for aborting feedlot heifers rather than for synchronization C Mode of action 1 Progesterone declines in the blood within 30 hours of injection 2 Decreases capillary blood ow 3 Interferes with converting cholesterol to progesterone 4 Floods luteal cells with excess calcium that is toxic E Response 1 If the animal is pregnant she will abort upon injection of PGF2 alpha 2 Cow will express estrus approximately 72 hr after injection 3 Will ovulate at approximately 96 hr 8 days in horse 4 Approximately 50 conception rate III Progestogen Control of Cycle A prevents the expression of estrus B Products Norgestomet SyncroMate B Melengestrol Acetate MGA Controlled Internal Device Release CIDR C Norgestomet is in an implant that is removed after 9 days and the cow is arti cially inseminated 48 hr later D Progestogens are less effective if no CL is present E Progestogens may also maintain pregnancy IV GnRH Control of Cycle A Induces luteinization ovulation of the follicle B Will induce anestrous cows to cycle C Products Cystorelin Fractrel Fertagyl D Acts by dumping pituitary LH arti cially making a CL V Corpus Luteum Requirement A If no CL is present the animal may be postpartum prepubertal or anestrous B Immature CL Day 15 1 Low af nity PGF2 alpha receptors 2 Low number of PGF2 alpha receptors 3 Lack of 2quotd messenger cascade C If pregnant PGF2 alpha aborts the CLfetus 1 Use up to 120 days of pregnancy thereafter cervix doesn t dilate 2 Induces parturition VI Estrus expression and enhancement of response with PGF2 alpha A 5 of animals in heat each day for 20 days B 5 have immature CL for Days l5 5 x 5 d means 25 of animals not responding 1 So if you only give one shot of PGF2alpha then 25 of your cows are not responsive 2 Solution Give two shots at an 11 day interval C Palpate to ensure the animal is cycling D Check heat for 5 days 1 If 5 are in heat each day then 100 of herd is cycling 2 If 2 are in heat each day then 40 of herd is cycling E Note that these numbers are theoretical and this may not always be the case 1 Some cows don t read the book VII Synchronization protocols for cows A Protocols often use a combination of the hormones mentioned before B Syncro Mate 1 Day 0 6 mg siliastic Norgestomet implant and 5 mg injection of estradiol valerate and 3 mg injection of Norgestomet 2 Day 9 remove implant 3 Remove calves from cow for 48 hr 4 Timed AI 48 hr after removal of implant or A1 at induced estrus or balance of both 5 6 per implant 6 6066 conception rates 7 Can use clean up bulls after AI 8 Some detected heats may not be ovulatory heats C OV Synch 1 Day 0 GnRH 2 Day 7 PGF 3 Day 9 GnRH 4 Day 10 AI 5 Used most commonly in dairy herds D CO Synch 1 Just like OVSynch except you A1 at the same time as the second GnRH injection 2 Used in beef cattle 3 Advantage over OVSynch only have to work the cattle 3 times as compared to 4 reduces labor costs E Select Synch 1 Day 0 GnRH 2 Day 7 PGF 3 Check estrus and AI 4 Select Synch plus the use of Norgestomet is good for noncycling cows a Increased heat and pregnancy rates b But it is more expensive and involves more labor F Melengestrol Acetate MGA 1 Feed for 14 days and remove 2 Day 19 cow will express subfertile estrus a It is considered subfertile because the follicle may have been mature but ovulation was prevented because of the progestogen therefore the follicle may be aged 3 Day 30 PGF injection 4 Day 33 fertile estrus 5 This is the best system for young heifers 6 MGA can also be fed between the GnRH and PGF shots in other protocols 7 Feed about 5 mg per head per day approximately 070day VIII Synchronization in Mares A PGF2 alpha Lutalyse 50 5 mg 15 dose in cow 1 Display estrus 3 days after injection 2 Ovulate 8 days after injection 3 Used for scheduling individual mare matings B GnRH Ovuplant 60 per implant 1 Use when a 30 mm follicle is present 2 AI 48 hr postimplant C Progestogen Regumate Altrenogest 34day 1 Feed for 12 days 2 Tease for optimal mating 3 Display estrus 24 days postwithdrawal 4 Ovulate 710 days postwithdrawal 5 Timed Al on day 5 postwithdrawal D Breeding on foal heat cycle 1 90 ofmares have a foal heat cycle 2 Can occur from day 312 after foaling avg 102 days 3 Not all mares are suited to be bred on foal heat a Little or no uterine uid with ovulation on Day 10 is optimal conditions for breeding on foal heat 4 10 7 20 lower pregnancy rates that normal estrous cycle 5 Allows next year s foal to be born earlier in the year 6 Can be manipulated to delay the foal heat ovulation or to shorten the subsequent cycle IX Synchronization m Swme A muenogesmkegumme Feed 15 mg dady for14718 days us rs expressed 6 days afterwxmdrawal s B Weanmg 1 Wean prgs at 28 days of age 2 Sow expresses estrus m 375 days c Induced puberty 2 PMSG ecc 400 IUhCG 2 0 IU 3 Induces prerpubenal grus mto femle estrus GHEH swan COSynch Ith 3 0 Day 1 9 rsan OVSynch 1235 spa 539 o Dav 7 3 1a GwRH Select Synch Rip 7 a Day 1 Check Egg 1 grggg GnRH Actinn
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