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Physiology of Egg Laying
Chapter Quiz
1
The blastoderm is the structure indicating fertilization in a chicken egg and is located where within the egg?
A)
in the very center of the yolk
B)
on the surface of the yolk
C)
on the chalaza, approximately one-half of the distance between yolk and shell membrane
D)
attached to the inner shell membrane
E)
between the inner and outer shell membrane
2
The blastodisk contains what?
A)
all of the cholesterol in the egg
B)
most of the albumen protein in the egg
C)
about 50 percent of the fat in the egg
D)
the majority of the vitamin A
E)
the chromosomes of the egg
3
The innermost layer of egg white is twisted in a ropelike structure that is given what term?
A)
chalaza
B)
inner shell membrane
C)
yolk
D)
blastodisk
E)
vitelline membrane
4
The reproductive organs of a normal adult layer hen include what parts?
A)
only a left ovary and oviduct
B)
only a right ovary and oviduct
C)
paired ovaries and oviducts as in gilts
D)
paired ovaries and oviducts, but no uterus
E)
paired ovaries and oviducts, but no vagina
5
The eggshell is almost completely composed of what material?
A)
calcium hydroxide
B)
magnesium phosphate
C)
sodium phosphate
D)
calcium carbonate
E)
phytate phosphorus
6
Ovulation in the duck is caused by what hormone?
A)
oxytocin
B)
prolactin
C)
follicle stimulating hormone
D)
luteinizing hormone
E)
estrogen
7
Expulsion of the duck egg is caused by what hormone?
A)
oxytocin
B)
prolactin
C)
follicle stimulating hormone
D)
luteinizing hormone
E)
estrogen
8
Formation of the eggshell is most influenced by what hormone?
A)
estrogen
B)
progesterone
C)
prolactin
D)
parathyroid hormone
E)
insulin
9
Which environmental factor is most important in commercial control of the onset of egg laying?
A)
amount of feed or calorie concentration of diet
B)
protein percentage in the diet
C)
calcium content of the diet
D)
length of artificial daylight provided
E)
vocal sounds of roosters provided by artificial means
10
Yolk color in layer hens is most influenced by what factor?
A)
age of hen
B)
breed of hen
C)
amount of light
D)
health status
E)
diet contents
11
Blood spots in eggs result generally from what occurrence?
A)
bruising of the hen in its cage
B)
too large an ova being produced
C)
intrafollicular hemorrhage prior to ovulation
D)
reproductive tract infections
E)
lack of sufficient iron in the hen's diet
12
Cholesterol content of the egg can be dramatically reduced by feeding hens a low cholesterol diet.
A)
TRUE
B)
FALSE
13
At peak production in commercial laying chicken operations about 155 eggs are collected per 100 hens per day.
A)
TRUE
B)
FALSE
14
Eggs are usually formed with the blunt end facing caudally but are laid with the pointed end facing caudally.
A)
TRUE
B)
FALSE
15
Chickens do not exhibit estrus.
A)
TRUE
B)
FALSE
16
In order for an egg to be laid it must pass through a portion of the digestive tract of the hen.
A)
TRUE
B)
FALSE
17
The testes of the male bird do not descend from the body into a scrotal structure.
A)
TRUE
B)
FALSE
18
In many species of birds, mating or fertilization is not necessary to prompt egg laying.
A)
TRUE
B)
FALSE
19
Eggshell color is an important indication of nutritional content of the egg.
A)
TRUE
B)
FALSE
20
At release, the ovum of a layer hen is about one-quarter the size of the ovum of a Guernsey cow.
A)
TRUE
B)
FALSE
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