Dairy science test 3

Dry cow

Cows not currently producing milk or expecting to calve

List three catecholamines hormones that can block the milk ejection

Dopamine Norepinephrine Epinephrine

List three non-lactating animals in a typical U.S dairy farm ?

Dry cow Bull Young stock

When do cows normally secrete colostrum?

During the early-lactation period

In which phase of its lactation does a dairy cow attains its peak milk yield?

Early lactation

In lactating cows, there is a positive correlation between milk yield and milk fat contents.

False

Which of the following chemical component of milk is not part of the solids not fat (SNF) portion?

Fat

Which of the following statements is true about the effect of feed intake on milk composition?

Feed intake has not effect in milk composition at all.

Which of the following products of ruminal fermentation are considered Greenhouse Gases that contribute toward climate warming?

Huge Production of carbon dioxide Huge Production of methane

Which of the following is true bout the biochemical composition of the milk?

It contains 87% water

A calf is for a cow, is for a doe

Kid

Which of the following terms describe he processes of milk formation and secretion in dairy cows and dairy does?

Lactation

The time where the cows produces milk is known as

Lactation Period

List 2 neurological control systems of the teats of dairy cows

Let down Tactile teat stimulation

The structure that serves as a bioreactor for milk biosynthesis is called

Mammary gland

There is significant difference in fat content of milk from cows and whales. What can you conclude from the statement?

Milk composition varies among species of animals

What is the normal length of gestation period of cow and a doe, respectively?

None of the above

Which of the following statement is not true about milk?

None of the above

List the four factors that affect milk compositions.

Nutrition influences Management pratices Stage of lactation Enviorment

Which of the following milk fatty acids is common mono unsaturated fatty acid?

Oleic

Which of the following hormones stimulates secretion of milk in a cow soon after calving?

Oxytocin

List two consecutive events that occur following gestation.

Parturation Lactation

Gestation terminates in dairy cows with which of the following events?

Parturition

Maternity pens

Pens where cows are moved when close to calving should ba monitored often should be clean dry and draft free

The rate of decline in milk yield after calving known as

Persistency

The first three weeks after calving is considered

Pre milk production period

The two galactopoietic hormones secreted during lactation

Prolactin and growth hormone

What is meant by persistency of lactation?

Rate in which milk yield declines

Avenue to transport milk from the udder to

Teats

As arule of thumb, in a profitable dairy farm, cows must have high persistency as well as high production

True

Cows that have a sharp decline in milk yield after the peak have a low persistency compared to cows that have gradual decline in yield.

True

Under normal production cycle, at which of the following age doe a heifer give birth of her first calve

Two years

The end-results of the microbial fermentation of fibrous plant materials in the rumen and used as row material for milk fat synthesis are

Volatile Fatty Acids

Colostrum

Yellow in color, salty very high in serum protiens provide antibodies for the neonates immune system

Which female reproductive organs or structures considered as a site of fertilization?

the infundibulum It should be the fallopian tubes

If for a cow to produce 1liter of milk needs 500 liters of blood have to pass through the udder, how many litter of blood is require for a cow that produces 20 liter of milk/day?

10,000

What is the average lactation length in dairy cows?

305 days

In the process of milk secretion which of the following two key interrelated components contribute to galactopoiesis?

A. Secretion of prolactin B. Secretion of growth hormone C. Frequent removal of milk from the udder D. Secretion of galactopoietic hormones Answer E. All of the above

In the process of tactile teat stimulation the release of oxytocin can be blocked by which hormone?

All of the above

Which of the following animal factors affect milk composition of a lactating cow?

All of the above

Which of the following is true about the origin of the nutrients used for milk biosynthesis

All of the above

Which of the following ruminal Volatile Fatty Acids are used a precursor for milk fat synthesis?

All of the above

In which of the following structures of the udder is milk synthesized?

Alveoli

Which one of the following terms is used to describe the morphologically programmed death of secretory cells of the udder after lactation?

Apoptosis

Regardless the breed of the cow, it is true that a big udder is related to a high milk production capacity

B.False

What do you call the index used to measure the amount of fat accumulated in the body of a cow during breeding?

Body condition score