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Ag Science > Sheep > Flashcards

Sheep Flashcards

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1
Q

Length of oestrous cycle

A

17 days

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2
Q

What is the length of a sheep gestation

A

147 days

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3
Q

Flushing

A

Process where ewes are moved from a low plane of nutrition to high plane of nutrition prior to mating

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4
Q

Maintenance diet

A

Breeding ewes are heavily stocked and good pasture

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5
Q

What should ewes body condition score be

A

3.5

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6
Q

Advantages of flushing

A

Increase ovulation leading to more eggs been released
increase contraception rates
better implantation of embryos in uterine wall
Increase letter-size leading to more twins and triplets
more regular oestrus cycles

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7
Q

Why should flushing continue four weeks after mating

A

-Ensure embryos develop properly
= due to spontaneous foetal death could occur during first 4 weeks of gestation
- lack of energy could also occur embryos could be reabsorbed in uterus

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8
Q

Synchronised breeding

A

Occurring at the same time

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9
Q

Sponging

A

Involves placing progesterone impregnated sponges into the ewes vagina

  • Sponges are removed 12 days later
  • ewes come into oestrus 2 days later
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10
Q

How to identify ewes that are in heat

A

Ram fitted with a raddle with a coloured crayon
- Raddle leaves a mark on each ewe they have mated with
= allows farmer to calculate lambing dates

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11
Q

how many days is the colour of the marker crayon changed

A

17 days

-to check if any ewes have been repeated

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12
Q

What does it mean if a large number of years have been repeated

A

It would be wise to check the fertility of the ram

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13
Q

When using synchronised breeding what is the ram to ewe ratio

A

1:10

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14
Q

Breeding out of season is

A
  • farmers induce onset of oestrus in July/August by inserting progesterone impregnated sponges in ewes vagina for 12 days
  • then injected with PMSG once the sponges removed
  • ram is introduced 24 hours later and Ewe should be in heat 48 hours later
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15
Q

The Ram effect

A

Some breeds encouraged to start ovulating 6 weeks earlier than normal by sudden introduction of the ram
- Success relies on the ewes and rams been separated for six weeks prior to mating at least 2 km away from each other

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16
Q

Length of pregnancy

A

Five months or 147 days

17
Q

Scanning

A

Determine the correct feed requirement of each ewe
Saves farmer money on feed
identifies Barren ewes
Aids separation of ewes carrying singles from ewes carrying twins and triplets
-Should be done in 80 days after the ram join flock

18
Q

Steaming up

A
  • increase amount of concentrates and decrease amount of bulky foods being fed to sheep in the late gestation in order to prevent twin lamb disease
  • last 6-8 weeks
19
Q

Reasons for steaming up

A
  • Insure a healthy lamb
  • insure ewe produces colostrum
  • prevent twin lamb disease
  • provide energy for birth
  • provide protein minerals and vitamins needed for good milk production
20
Q

Winter housing should have

A 
Good ventilation 
adequate floorspace (3.24m squared)
feeding space 
strawberry bedded or slats 
clean
21
Q

What should ewes body condition score be if carrying a single lambs or twin lambs

A

Single 3.0-3.5

Twins 3.5-4

22
Q

What should lambs weight be when born

A

Between 3 and 5 kg

23
Q

What happens when lamb is born

A

=Ewe should be allowed lick the lamb
- helps to stimulate the circulatory system
- helps with bonding process
=A lamb should get to its feet after a few minutes and start to suckling
=Udder of ewe should be checked to ensure she producing colostrum
- contains vital antibodies
- 1 litre in first 24 hrs
= lamb navel dipped with iodine
=prevent navel and joint ill

24
Q

Hypothermia occurs when

A

Body loses heat quickly causing dangerous low body temperature that interferes with the normal functioning of the body
=should be injected with glucose
=infor red lamp

25
Q

Methods of fostering lambs

A 
Wet fostering 
Fostering crate 
skinning a dead lamb 
fostering products 
A dog
26
Q

Wet fostering

A

Using birth fluids of ewe with single lamb

  • Foster lamb first washed to remove scent of own dam
  • Temporarily tide so can’t stand
  • Lamb coated in foster mothers birth fluid
  • After 20 minutes lamb untied
27
Q

Foster crate

A
  • Prevent ewe from kicking or hurting foster lamb

- few days later lamb adapt the smell of ewe and ewe will accept lamb

28
Q

Skinning dead lamb

A
  • ewes natural lamb dies the dead lamb skinned
  • skin is attached to foster lamb using string
  • fools the ewe into excepting foster lamb
  • once the ewe accepts the lamb, skin can be removed
29
Q

Post lambing

A

Ewe kept on high plane of nutrition to ensure good milk production
= If grass is scarce ewes continue to be fed concentrate to prevent any reduction in ewes milk yield
=Should be rotation new grazed
=Sold once reached slaughterweight (34 to 40 kg)

30
Q

Weaning

A

Ewes and lambs separated

Ewes put on bare pasture to dry off in prep for flushing

31
Q

Maternal sire that should be used when replacing ewes

A

Belclare
border Leicester
blue faced Leicester

32
Q

General management

A 
Vaccination program 
dosing 
dipping 
Dagging and docking 
foot bath, foot trimming and pairing 
Shearing
33
Q

Dosing /drenching

A

Prevent buildup of stomach worms liver fluke and other internal parasites
= Put on the back of the tongue of animal using either dosing gun for ewes or syringe for lambs

34
Q

Dipping

A

-Prevent fly strike in summer
-prevent mange mite which causes sheep scab in winter
=Dip for at least one minute and head must be immersed twice
OR
-Could use pour ons or sprays (click)
=Sprayed along the back around the tail region of the animal

35
Q

Dagging/crutching

A

Removal of wall around the tail of the sheep

  • Prevent intestinal worms causing diarrhoea which causes faeces to build up around a tail
  • attracts bluebottles, which lay eggs and hatch into maggots which feed on flash of the animal
36
Q

Docking

A

Move part of lamb tail
-Prevent buildup of faeces help reduce fly strike
-Rubber band which is applied using elastrator
=Rubber band cuts off blood supply to tail

Ag Science (3 decks)

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