Animal Reproduction PP Part 1

Page
1

Slide 1

Animal Science

Animal Reproduction

Meet Chris P Bacon

Chris P Bacon with cat

Slide 2

Reproduction

DEFINITION:

The natural process among organisms by which new

individuals are generated and the species perpetuated.

Slide 3

Key Terms So far…

Conception

Gestation

Parturition

Colostrum

Slide 4

Estrus (Estrous)

DEFINITION:

The periodic state in which most female mammals (excluding humans) are approaching ovulation and most receptive to mating. Also known as “heat”.

Slide 5

Different species Cycles

Estrous cycle- reoccurs as long as the animal is not pregnant

Categorized by the frequency of occurrence throughout the year

Polyestrous (poly=many)

Seasonally polyestrous

Monoestrous (mono=one)

Diestrous (di=two)

Slide 6

Different species Cycles

Seasonally Polyestrus- cycles occur only at certain times of the year

Horses-Long-day breeders- go into estrus as days get longer

Sheep-Short-day breeders- go into estrus as days get shorter

Slide 7

Different species Cycles

Horse gestation- 340 days (11 months)

Breeds in the Spring

Why?

Sheep gestation- 145 days (5 months)

Breeds in the Fall

Why?

Slide 8

Different species Cycles

Monoestrus/Diestrus- go into heat only once or twice per year

Wolves are monoestrus

Dogs are diestrus or sometimes more (domestication)

Slide 9

Different species Cycles

Polyestrus- go into heat many times per year

Cats, Cows and Pigs

Slide 10

Controlling Reproduction

Cows

Why is it reproduction extremely important with dairy cows?

No Baby = No Milk = No Money

Slide 11

Controlling Reproduction

Cows

Different ways to detect heat

Watching animals

Painting tails

Heat detector aids

Pedometers

Just let a bull do it

Slide 12