Cattle Reproduction Jason Ahola PhD Graduate Student Department of Animal Sciences Colorado State University Cow’s Reproductive Cycle Follicles and New Corpus Luteum Reproductive Tract Mature Corpus Luteum Anatomy Physiology Ovary Corpus Luteum Insemination Timeline Sperm Viability 12 to 30 h sperm transport 6h Ova viability 8 to 12 h 24 - 32 h Onset of E strus Ovulation Synchronization Estrous Cycle New CL Forming Fol. Size & CL Size Mature CL Present Hormone Level Progesterone (P4) Estradiol (E2) 0 2 4 6 8 10 12 14 Day of Estrous Cycle 16 18 20 1 Hormone Level Follicular Waves Ovarian Follicular Pool E2 P4 Ovulation Attretic (Die) Single Injection w/ Post-Breeding Inject PGF2 Turn in Bulls Day 0 Day 5 Check for estrus and inseminate Hormone Level Follicular Waves Ovarian Follicular Pool E2 P4 Ovulation Attretic (Die) Select Synch GnRH injection Day 0 PGF2 injection Day 7 Check for heat and breed Day 6 to12 MGA-GnRH-PG (MGA® Select) Feed MGA 0.5 mg/hd/d Inject GnRH Inject PGF2 Turn in Bulls Day 0 Day 24 Day 33 Day 36 Day 14 Sub-fertile heat Check for estrus and inseminate. Comparing the Options Treatment Estrus Response Pregnancy Rate 2 Shot PG MGA-PG 14-19 Select Synch Ov-Synch CO-Synch MGA Select 7-11 Synch 57% 83% 67% NA NA 85% 91% 35% 63% 45% 52% 55% 66% 68% Heat Detection Chin Ball Markers KaMar/ Bovine Beacon Tail Paint Tail Paint Heat Watch 1. Transmitter with pressure sensitive button on top 3. The receiver accepts the mounting activity signal from the transmitter Receiver 2. Mounted onto cow’s rump using a patch and adhesive 4. Information is transferred to computer for processing by HeatWatch software.
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