Dhi Herd Summary Questions

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.$500b.$108c.$120d.$1000

2. Which group of cows had the highest percentage of somatic cell count over 566,000?

a.1st lactationb.2nd lactation

c.3rd lactationd.none of the above

3. In which month was the percentage fat the highest?

a.Decemberb.October

c.Februaryd.All of the above

4. The project milk production for cows in their second lactation is?

a.25232b.22369c.28098d.25462

5. Did this farmer increase or decrease the number of cows in his herd?

a.increaseb.decrease

6. During this test period, income over feed cost for all cows was?

a.-$2.00b.$4.55c.$3.91d.$6.35

7. The average number of days dry for all cows this test period was?

a.84 daysb.66 daysc.71 daysd.56 days

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.Januaryb.Februaryc.Marchd.June

10. This herd produced the most milk during which stage of lactation (days)?

a.41-100b.101-199c.200-305d.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 primarilyat the:

a.bone structureb.rib cage

c.pelvic aread. all of the above

13. Feeding a ration that does not have the correct calcium – phosphorus ratio can cause:

a.Ketosisb.Leptospirosis

c.Bloatingd.Milk Fever

14. The average gestation period for dairy cows is:

a.21 daysb.15 daysc.383 daysd.283 days

15. The primary sugar in milk is:

a.Leucineb.Sucrose

c.Arginined.Lactose

16. Cows with chronic mastitis infection that do not respond to treatment should be?

a.treated againb.culled from the herd

c.fed mored.none of the above

17. When do lactating dairy cows most often acquire mastitis?

a.dry periodb.early lactation

c.mid lactationd.late lactation

18. The hormones produced by the posterior pituitary which stimulates “milk letdown is called?

a.oxytocinb.petrissin

c.adrenalind.thyroxine

19. The heritability of milk production is:

a.15%b.25%

c.55%d.70%

20. Forty percent of all dairy cattle have an extra nonfunctional teat that is called:

a.intermammy teatsb.olfactory teats

c.supernumerary teatsd.intraramenal teats

21. To produce one pound of whole milk cheese takes about _____ pounds of whole milk of average milkfat test.

a.5b.10

c.20d.30

22. Which dairy breed on the average produces the highest butterfat?

a.Ayrshireb.Brown Swiss

c.Holsteind.Jersey

23. The Ayrshire breed of cattle originated in?

a.Switzerlandb.Holland

c.Scotlandd.England

24. Poisonous compounds produced by molds are referred to as:

a.Pathogensb.Mycotoxins

c.Allergensd.Vaccinations

25. The most desired and economical breeding age of heifers is:

a.2 yearsb.7-10 months

c.20-23 monthsd.13-15 months

2013DAIRY CATTLE JUDGING KEY

1.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 bullsisbeingconsideredfor breedingthe 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 Dairyhas225 grade cows with a herdaveraging 28,200 pounds of milk.NetMeritDollarsis themaincriteriathat sheselectsfor mating purposes. Today she is looking for sires that have atleast80%reliabilityontheirproofs. When mated to cows this bull should improve longevity by correcting existing problemswithfeet,legs,orudders.

Enter your placing and reasons on the following page.File: 1a SireSelection_QUIZ2013

Your Results

Placing:_4__3__2__1_

1ST2ND3RD4TH

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.