Dairy Cattle Reproduction (Part 1)

Question 1

Contribution to world milk production
Cattle

Answer 1

83%

Question 2

Contribution to world milk production
Goat

Answer 2

2%

Question 3

Contribution to world milk production
Buffalo

Answer 3

13%

Question 4

Contribution to world milk production
Sheep

Answer 4

1%

Question 5

Camels

Answer 5

.4%

Question 6

Contribution to world milk production
Equine & yak

Answer 6

.6%

Question 7

Contribution to world milk production

Answer 7

Cattle
Buffalo
Goat
Sheep
Other species
Camels

Question 8

Which one is more important in milk production ?
Goat & Sheep

Answer 8

Goat

Question 9

Holstein cow By 2010 yield

Answer 9

4.5 times the production of her ancestors at 1940 (2097 kg vs. 9590 kg)

Question 10

Higher milk production is commonly associated with …… in dairy cows

Answer 10

Reduced fertility

Question 11

Why and why not I choose this job / project?

Answer 11

• The demand for milk has always increased
• Employment is uniform throughout the yean
• Income is guaranteed every day
• The most advanced among animal production projects
• As a lifestyle, many believe that dairying is unsurpassable Be with animals. Be outside

Question 12

Egypt Kg Per Capita

Answer 12

42 Kg

Question 13

Top average country Per Capita

Answer 13

Finland → 457 Kg

Question 14

Bottom average country Per Capita

Answer 14

Timor → 1.02 Kg

Question 15

Egypt`s Milk Profile

Answer 15

4.7 million tons/year

Question 16

HOW TO OPTIMISE REPRODUCTION & REDUCE INVOLUNTARY CULLING

Answer 16

The optimal calving interval is 12— 12.5 months

Question 17

Which Cow is eligible for breeding?

Answer 17

Normal cow and passed 50 - 60 days after calving

Question 18

To achieve a Cl of 365-380 d

Answer 18

The early postpartum period is critical (Fresh cows) :

• Rapid involution of the uterus
• Rapid resumption of normal ovarian activity

Question 19

With AI

Answer 19

• Accurate estrus detection (HD)
• High conception (proper insemination) (CR)

Question 20

Economic Loss due to Infertility (Long Calving Interval)

Answer 20

• Less lifetime milk yield
• Fewer calves for replacement
• Direct costs
• Culling of valuable cows

Question 21

Cow Puberty

Answer 21

Able to release gametes and to manifest sexual behavior

• Age of puberty: 5 - 18 months
• It depends mainly on body weight (280 - 300 Kg)

Question 22

Jersey Puberty

Answer 22

9 Months

Question 23

Holstein Puberty

Answer 23

11 Months

Question 24

Cows estrous

Answer 24

21 Days
polyestrous and not seasonal

Question 25

Estrous will continue , excpet

Answer 25

- During pregnancy - Negative energy balance , as during high milk yield (Energy produced in milk is higher than consumed one) - A short period after calving - Disease (e.g. smooth ovaries)

Question 26

Silent heat; silent ovulation, or Subestrus

Answer 26

- Animals fail to show signs of estrus despite having normal cycle - It can he due to the herdsperson failing to observe the signs; rather than a failure of the cow to show signs

Question 27

Estrus (Heat)

Answer 27

2 - 30 hours 15 hours in mean

Question 28

Days open

Answer 28

75 - 110 Day

Question 29

Ovulation type

Answer 29

Spontaneous

Question 30

CL life span

Answer 30

14 - 16 days

Question 31

Advantages of 21-PR as a measure of fertility

Answer 31

It takes into account both SR and CR It summarizes herd fertility at short intervals Therefore, it has become the standard measure of reproductive performance The 21 -d PR should be 35% or greater. However, many herds achieve 21 -PR of to 25%.

Question 32

The 21 -d PR should be ...

Answer 32

35% or greater

Question 33

Calving interval is used for .....

Answer 33

individual cows

Question 34

Calving index is the .......

Answer 34

average of calving intervals of all cows

Question 35

CCI

Answer 35

interval from calving to conception (for pregnant cows)

Question 36

DO

Answer 36

interval from calving to conception (for pregnant cows) + interval from calving to culling or to death (for cows failing to conceive)

Question 37

SPC

Answer 37

the inverse of CR