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
