Repro Chapter 1 Part 3 Flashcards Preview

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Flashcards in Repro Chapter 1 Part 3 Deck (10):
1

What environmental factors affect reproduction?

 

 

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rainfall - food temperature - seasonal photoperiod - day length

2

What are pheromones?

chemicals that allow communication among animals through the vemeronasal organ

3

Sex hormones alter ___________.

reproductive behavior

4

What is the Whitten effect?

synchronization of estrus stimulated by protein in male urine that stimulates synthesis and secretion of gonadotrophins

5

What is the Bruce Effect?

Observed termination of pregnancy when introduced to a foreign male

6

What is the reasoning for the Bruce Effect?

Pheromone blocks the secretion of prolactin which is responsible for the maintenance of corpora lutea

7

Bruce Effect is limited to rodents. True or false?

False; it has been observed in Geladas

8

What are the 2 practical applications of the Whitten Effect?

Manipulate the estrous cycle in animals. Advance the onset of puberty in pigs by introducing a boar to gilts (pre-pubic)

9

What is the Ram Effect?

A male sheep is introduced into a flock of ewes before the breeding season to ensure ovarian cycle at the beginning of the breeding season.

10

What are the 2 practical applications of the Bruce Effect?

Management of the mouse breeding colony - Do not expose female to foreign males after mating. Pest Control