Other Influences on Sexual Maturation

Question 1

What affects age and speed of maturation?

Answer 1

Genetics, nutrition, social cues and photoperiod

-occur in males & females but have stronger affect in females

Question 2

Which breeds have earlier on set of puberty.. maternal/milking or meat production?

Answer 2

Maternal/milking breeds and early maturing breeds

Question 3

Does nutrition delay puberty?

Answer 3

Yes, poor nutrition can delay puberty. It influences age of puberty and reproduction

Question 4

Adipocytes

Answer 4

Release leptin into blood stimulates neuropeptide Y neurons that signal GnRH neurons to release GnRH

Question 5

GH stimulates release of….

Answer 5

IGF-1 from hepatocytes; IGF-1 provides negative feedback on GH release

Question 6

What spikes/drops at puberty?

Answer 6

IGF-1 levels spike and GH levels drop due to negative feedback

Question 7

Why is IGF-1 necessary?

Answer 7

For maturation and growth of many tissues, including reproductive tissue

Question 8

Social Cues

Answer 8

Olfactory recognition of pheromones