ND Dairy Cattle CDE
DAIRY MANAGEMENT WRITTEN EXERCISE
2013
DHI HERD SUMMARY QUESTIONS
1. How many dollars were lost to this dairy farmer during this test period due to a high somatic cell count?
a.
$500
b.
$108
c.
$120
d.
$1000
2. Which group of cows had the highest percentage of somatic cell count over 566,000?
a.
1st lactation
b.
2nd lactation
rd
c.
3 lactation
d.
none of the above
3. In which month was the percentage fat the highest?
a.
December
b.
October
c.
February
d.
All of the above
4. The project milk production for cows in their second lactation is?
a.
25232
b.
22369
c.
28098
d.
25462
6. During this test period, income over feed cost for all cows was?
a.
-$2.00
b.
$4.55
c.
$3.91
d.
$6.35
7. The average number of days dry for all cows this test period was?
a.
84 days
b.
66 days
c.
71 days
d.
56 days
5. Did this farmer increase or decrease the number of cows in his herd?
a.
increase
b.
decrease
8. What percentage of the cow herd was diagnosed as open for over 100 days?
a.
11 % b.
5 % c.
13 %
d.
20%
9. In which month will the lowest number of cows be dry?
a.
January
b.
February
c.
March
d.
10. This herd produced the most milk during which stage of lactation (days)?
a.
41-100
b.
101-199
c.
200-305
June
d.
306+
GENERAL QUESTIONS
11. The form of mastitis that is hidden from sight is known as _______
a.
Infectious
b.
Clinical
c.
Acute
d.
Sub-clinical
12. In the linear classification system, the classifier evaluates depth of body by looking primarily at the:
a.
bone structure
b.
rib cage
c.
pelvic area
d.
all of the above
13. Feeding a ration that does not have the correct calcium – phosphorus ratio can cause:
a.
Ketosis
b.
Leptospirosis
c.
Bloating
d.
Milk Fever
14. The average gestation period for dairy cows is:
a.
21 days
b.
15 days
c.
383 days
d.
283 days
15. The primary sugar in milk is:
a.
Leucine
c.
Arginine
b.
d.
Sucrose
Lactose
16. Cows with chronic mastitis infection that do not respond to treatment should be?
a.
treated again
b.
culled from the herd
c.
fed more
d.
none of the above
17. When do lactating dairy cows most often acquire mastitis?
a.
dry period
b.
early lactation
c.
mid lactation
d.
late lactation
18. The hormones produced by the posterior pituitary which stimulates “milk letdown is called?
a.
oxytocin
b.
petrissin
c.
adrenalin
d.
thyroxine
19. The heritability of milk production is:
a.
15%
c.
55%
b.
d.
25%
70%
20. Forty percent of all dairy cattle have an extra nonfunctional teat that is called:
a.
intermammy teats
b.
olfactory teats
c.
supernumerary teats
d.
intraramenal teats
21. To produce one pound of whole milk cheese takes about _____ pounds of whole milk of average milkfat
test.
a.
5
b.
10
c.
20
d.
30
22. Which dairy breed on the average produces the highest butterfat?
a.
Ayrshire
b.
Brown Swiss
c.
Holstein
d.
Jersey
23. The Ayrshire breed of cattle originated in?
a.
Switzerland
b.
c.
Scotland
d.
Holland
England
24. Poisonous compounds produced by molds are referred to as:
a.
Pathogens
b.
Mycotoxins
c.
Allergens
d.
Vaccinations
25. The most desired and economical breeding age of heifers is:
a.
2 years
b.
7-10 months
c.
20-23 months
d.
13-15 months
2013
1.
DAIRY CATTLE JUDGING KEY
b
2.
c
3.
d.
4.
d
5.
a
6.
c.
7.
c.
8.
d.
9.
d.
10.
c
11.
d.
12.
b
13.
d.
14.
d
15.
d.
16.
b
17.
b
18.
a
19.
b
20.
c.
21.
b
22.
d
23.
c.
24.
b.
25.
d.
Name____________
Chapter___________
Contestant #___________
2013 North Dakota FFA Convention
B Dairy Cattle Judging Contest B
SIRE SELECTION
EXAM [50 points]
The semen from the listed bulls is being considered for breeding the three-year old cow listed on the left-hand
side of the table below. Use the following criteria to examine the four bulls on the right-hand portion of the
table for the mating program on this dairy.
Situation:
The Nominee Creek Dairy has 225 grade cows with a herd averaging 28,200 pounds of milk. Net Merit Dollars is
the main criteria that she selects for mating purposes. Today she is looking for sires that have at least 80%
reliability on their proofs. When mated to cows this bull should improve longevity by correcting existing
problems with feet, legs, or udders.
Cow to be mated
3 year old record
(3 yr. 1 mo.)
29712
3.8
1163
3.05
889
Linear Scores
35
32
30
30
24
30
20
30
23
26
25
15
07
08
Bulls to be considered
Traits
REL %
PTA Milk
Fat %
Fat lb.
Pro %
Protein lb.
Type
Somatic Cell Score
Productive Life
DPR
Net Merit $
Stature
Strength
Body Depth
Dairy Form
Rump Angle
Thurl Width
Legs side view
Foot angle
Fore Udder Attachment
Rear Udder Height
Rear Udder Width
Udder Cleft
Udder Depth
Teat Placement
1
2
3
4
70
3083
-.10
84
-.07
73
1.49
2.74
.6
-2.0
570
86
1877
-.06
51
.00
54
2.36
2.88
1.8
-.3
569
88
1372
.04
61
.01
46
2.84
2.90
1.7
.3
565
93
2166
0.02
73
.01
69
.99
2.96
1.9
.5
656
2.49
2.46
2.15
1.60
2.15
3.41
-1.68
1.54
1.92
3.15
3.49
1.99
.02
.88
1.97
1.07
1.11
.99
.88
.49
-1.89
1.59
2.40
2.89
2.33
.42
.15
-1.13
2.29
.72
1.07
2.19
2.57
1.36
.69
.80
2.97
2.84
3.64
2.75
2.84
3.65
1.68
-.25
.26
1.40
-.85
-1.79
-1.07
1.22
2.34
.12
-.09
1.44
2.73
2.19
Enter your placing and reasons on the following page.
File: 1a
SireSelection_QUIZ2013
Your Results
Placing:
_4_
1ST
_3_
2ND
_2_
3RD
_1_
4TH
Reasons:
The order of sires selected for this mating exercise is 4-3-2-1 with cuts of 3-4-4, respectively. I selected 4 and
placed him over 3 because 4 is $90 higher on Met Merit Dollars the primary criteria in the farmer’s breeding
plan for sire selection. However, I grant that 3 is slightly higher in the three udder traits that the cow chosen
for mating needs to improve in her offspring.
Although my middle pair of sires have nearly identical scores for Net Merit $, bull 3 easily places over 2
because 3 is expected to correct the functional faults of the mated cow. This cow is too deep in the udder, has
a wider than desirable teat placement and lacks udder cleft. Sire 3 has much higher genetic evaluations for
udder cleft, udder depth, and teat placement than does 2.
Finally, I place 2 over 1 because 1’s sire proof has only 70% reliability. Remember the manager of this herd set
a minimum requirement of at least 80% reliability.