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Sheep Science > Quiz III > Flashcards

Quiz III Flashcards

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1
Q

Define creep feeding

A

Used as a supplementation for the mother’s milk. A pen designed where lambs can enter an eat a creep feed ration, but ewes cannot enter

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2
Q

How long is estrus in the ewe?

A

20-42 hours

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3
Q

How long is the estrous period in the ewe?

A

20-42 hours

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4
Q

How long is the estrous cycle in the ewe?

A

16-17 days

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5
Q

How long is the gestation length in ewes?

A

147 days

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6
Q

Define heterosis

A

Increase vigor or vitality of crossbreds as compared to average of parental breeds

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7
Q

Why do you need to adjust factors based on age group?

A

Sheep are at peak production at 3-6 yr
1-2 yr old are immature and have not reached peak production
>6 yr olds have passed peak production

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8
Q

3 main causes of sheep number decline

A
  1. Foot rot
  2. Internal parasites
  3. Predators
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9
Q

Stomach worm resides in the _____ of the sheep

A

Abomasum of the sheep

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10
Q

You can never rid sheep completely free of _____ in state of KY

A

Stomach worm

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11
Q

Stomach worm is a _____, while the tapeworm is a _____

A

Tapeworm - nutrient robber/lives off feedstuff in abomasum

Stomach worm - blood sucker

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12
Q

Main symptoms of stomach worm

A

Anemia and Edema (bottle jaw)

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13
Q

FAMACHA Score goes from ____ to ____

A

1-5 (5 is really dangerous - pale/white)

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14
Q

What drenchers (dewormers) can we use? Commerical and not

A

*Copper sulfate
*Cydectin
*Ivermectin
Panacure
Tramasol
Albasin

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15
Q

How to manage/control stomach worm?

A

Pasture rotation (Should let a pasture grow back 28-30d)

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16
Q

Breeding Soundness Exam (BSE) has five components

A
  1. Examination
  2. Palpation
  3. Semen Evaluation
  4. Overall rating
  5. Interpretation
17
Q

What is BSE?

A

An evaluation of potential ability of a male to impregnate a given # of females within a defined mating period and gives a rating for just 1 particular point in time.

18
Q

Rams 8-14mo old should have a scrotal circumference of _____ to be considered exceptional.

A

> 36 cm

19
Q

Rams > 14mo old should have a scrotal circumference of _____ to be considered exceptional.

A

> 40 cm

20
Q

Body condition score goes from ____ to ____

A

1-5

5 - overconditioned

21
Q

What % motility is considered exceptional? Questionable?

A

70-100% is exceptional

10-30% is questionable

22
Q

Questionable males may breed to _____ or _____.

A

Limited number of ewes under limited conditions

Retest in 30-60 days

23
Q

Satisfactory males will be able to impregnate at least _____ ewes in a _____ day period.

A

50 ewes in a 34-d breeding period

24
Q

Exceptional males will be able to impregnate at least _____ ewes in a _____ day period.

A

100 ewes in a 34-d breeding period

25
Q

Female sheep reach maturity at _____

A

5-8 mo

26
Q

Female should be at least _____ before mating

A

7-8 mo

27
Q

What is the estrous period?

A

Heat. Length of time when a ewe will accept the ram. Ranges from 20-42 hrs (avg 30-35h)

28
Q

What is the estrous cycle?

A

16-17d period (from beginning of one heat to the beginning of another)

29
Q

Ovulation occurs during the _____ of the estrous PERIOD

A

Last 6-10 hrs of heat

30
Q

KY ewes are typically bred in

A

Aug/Sept

31
Q

Progesterone performs 4 functions during pregnancy:

A
  1. Keeps ewe from exhibiting heat
  2. Reduces LH production
  3. Keeps the ewe pregnant
  4. Stimulates mammary development
32
Q

What is seasonally polyestrus?

A

Ewes will exhibit recurring estrous cycles if no conception occurs, but only during certain seasons of the year.

33
Q

Normal mating season for ewes in KY is in the _____

A

Fall (Oct, Nov)

34
Q

What is the biggest reproductive problem in ewes?

A

Seasonal anestrus

35
Q

4 Factors that affect sexual activity in ewes

A
  1. Daylight (Max sex activity occurs when daylight is 10-12 hr/d)
  2. Temperature (avg 74 F)
  3. Relative humidity (Less humidity the better)
  4. Nutritional flushing (Increases ovulation rate)

Sheep Science (13 decks)

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