Puberty Age Of Animals
6 Female Brain Development Ovary E2E2 E2E2 E2E2 Placenta E2E2 FP + E 2 Surge Center Develops Surge Center Develops Blood Brain Barrier
9 Puberty in the Female Age at first estrus (heat) Age at first ovulation Age at which the female can support pregnancy
10 Puberty in the Male Age when behavioral traits are expressed Age at first ejaculation Age when sperm first appear in the ejaculate Age when sperm first appear in the urine Age when the ejaculate contains a threshold number of sperm
Do Dogs Go Through Puberty?
11 Average Age of Puberty (Range) SpeciesMaleFemale Bovine11 mo (7-18)11 mo (9-24) Ovine7 mo (6-9)7 mo (4-14) Porcine7 mo (5-8)6 mo (5-7) Equine14 mo (10-24)18 mo (12-19) Human13 yr12 yr Canine9 mo (5 - 12)12 mo (6 - 24) Feline9 mo (8 - 10)8 mo (4 -12)
14 GnRH Pulses Determine Puberty Prepubertal period » minimal GnRH release » FSH and LH low » minimal to no folliculargenesis or spermatogenesis Puberty » increase in the pulse frequency and amplitude of GnRH release » increase in FSH and LH pulses » folliculargenesis and spermatogenesis occur
29 Testosterone Remains Low Sertoli cells mature and multiply Spermatogonia begin to divide LH (ng/ml) FSH (ng/ml) Testosterone (ng/ml) LH FSH T T
Science: Animals Including Humans: Puberty Year 5 Lesson Pack 3
36 Effect of 2-deoxyglucose on LH Pulses Decreased Amplitude and Frequency 3 2 1 01234567891011 Time (hours) LH (ng/ml) GnRH Before 2DGDuring 2DG
37 Metabolic Signals Influence GnRH Neurons GnRH Adipocytes (Fat) Leptin Blood Glucose GnRH neurons Glucose sensing neurons Neuropeptide Y neurons Blood Fatty Acids ? ? Fatty Acid sensing neurons
38 Effect of Nutrition on Puberty 12 10 8 6 4 2 0 0 4812 162024 Body Weight (X 100 lbs.) Age (months) Puberty 2.0 lb/day 1.2 lb/day 1.5 lb/day
How To Tell If You've Hit Puberty (boys): 13 Common Signs
43 Influence of Growth Rate and Bull Exposure on Age of Puberty Moderate Growth Rate High Growth Rate Moderate Growth Rate High Growth Rate 0 100 200 300 400 500 Age at Puberty (days) Heifers only Bull Exposure 449 428 422 375
45 Recommended Age to Breed Heifer15 months (65% mature BW) Bull15 natural mating, 12 months AI Filly2-3 years Colt2 years Boar9 months
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Age Of Sexual Maturity
43 Influence of Growth Rate and Bull Exposure on Age of Puberty Moderate Growth Rate High Growth Rate Moderate Growth Rate High Growth Rate 0 100 200 300 400 500 Age at Puberty (days) Heifers only Bull Exposure 449 428 422 375
45 Recommended Age to Breed Heifer15 months (65% mature BW) Bull15 natural mating, 12 months AI Filly2-3 years Colt2 years Boar9 months
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