A19: . Breeding goals and traits of sheep production, types, usage and products. Flashcards

1
Q

List the uses of shee

A

Use of Sheep:
-> Wool
-> Meat: Mutton + Lamb
‣ New crop lamb (15 kg)
‣ Light lamb (25 kg)
‣ Heavy lamb (40 kg)
-> Sheepskin
◦ Clothes
◦ Footwear
◦ Rugs, Etc.
-> By products
◦ Tallow → candle and soap making
◦ Gelatin

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
2
Q

What are the results of trait-based selection influenced by?

A

Inheritance (heritability, repeatabilty) of characteristics.
Correlations btw characteristics.

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
3
Q

What maternal effects carry over?

A

pregnancy,
twins,
multiple births,
birth weight,
viability,
milk-suckling

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
4
Q

live weights:
birth weight of lambs?
weaning weight?
weight at 6 months?
fully mature weight?

A

Birth weight of lambs (2-4kg),
Weaning weight (30-day weight: 14-17kg),
Weight at 6, 9 months, yearling, mature adult (30-40 kg, 60-130kg, ram 30-40% more)

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
5
Q

What is the daily weight gain?

A

100-600g/day,
ram 15-20% more

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
6
Q

What is the specific feed conversion of sheep?

A

Rate of gain/ unit feed consumed (specific feed conversion): 3.2-3.7kg/kg.
rams are better.

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
7
Q

What are traits of the carcass?

A
  • Carcass weight
  • Carcass quality (colour, tenderness, flavour, palatability).
  • Degree of fatness; -Back fat thickness over loin eye (23%).
  • Fat around kidneys.
  • Tallow (fat), bone, lean %.
  • Valuable ratio (primal cuts):
    o Shoulder o Rack o Loin o Legs
  • Loin (and back) ratio (wide, muscular loin, loin eye area, body length, marbled intramusc. Fat).
  • Carcass: neck, fore shank, shoulder, breast, rack, loin, flank, legs(extreme muscling, muscular hypertrophy, CLPG).
How well did you know this?
1
Not at all
2
3
4
5
Perfectly
8
Q

What are the traits of fine wool and fur?

A
  • Grease (fleece weight): 4 - 8kg
  • Wool (clean fleece weight)
  • Wool thickness
  • S/P ratio = secondary: primary follicle ratio)
  • Fineness → length & diameter of fiber (20 - 33 microns).
  • Medullation of fiber
  • Crimps
  • Staple (combing fiber) 5 - 15cm
  • Curl type and size.
  • Cashmere & angora goats: Mohair, pashmina.
    wrinkles or skin folds.
    fibre length and diameter: 40 - 60 microns, coarse and carpet wool.
How well did you know this?
1
Not at all
2
3
4
5
Perfectly
9
Q

What are the milk production traits in sheep?

A
  • Milk yield
  • Lactation performance:
    o Sheep 80-300 (600) L
    o Length of lactation 150-200 days
  • Daily milk yield
  • Milk fat % -high
  • Milk protein % -high
  • Ease of milking (milking machine), dairy sheep: machine milking
  • Udder size & form
How well did you know this?
1
Not at all
2
3
4
5
Perfectly