Breeding and hybrid vigour
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Breeding and hybrid vigour L.O. – To know how farmers may improve their livestock through selective breeding PowerPoint PPT Presentation


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Breeding and hybrid vigour L.O. – To know how farmers may improve their livestock through selective breeding. Starter questions Serena the sow was pink skin. This is recessive. 1. What might her two genes be? PP, pp or Pp Scott the boar has black skin. This is dominant.

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Breeding and hybrid vigour L.O. – To know how farmers may improve their livestock through selective breeding

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Breeding and hybrid vigour l o to know how farmers may improve their livestock through selective breeding

Breeding and hybrid vigourL.O. –To know how farmers may improve their livestock through selective breeding

Starter questions

Serena the sow was pink skin. This is recessive.

1. What might her two genes be?

PP, pp or Pp

Scott the boar has black skin. This is dominant.

2. What might his genotype be? (There are two possibilities!)

PP and Pp or pp and Pp

3. TRY IT - Draw a punnet square for what would happen if Scott and Serena mated.


Hybrid vigour

Hybrid vigour

……..describes the possibility of obtaining a "better" individual by combining the virtues of its parents.

  • These parents are of different breeds.

  • This is because HYBRIDS are generally HETEROZYGOUS, that is they will have two different genes for each quality.

  • It doesn't always work and sometimes HYBRIDS don’t inherit enough of the parents good qualities.


Cattle breeding

Cattle breeding

  • How might we improve a Jersey cow by breeding with a Highland cow?

  • What might be the disadvantages?


Factors that may be targeted by selective breeding

Factors that may be targeted by selective breeding

  • Yield

  • Disease resistance

  • Hardiness

  • Confirmation

  • Appearance

    Copy these down and summarise what each of them means.


3 very different sheep

3 very different sheep!!!

Shropshires are a medium sized sheep which stresses soundness, carcass quality and breed type. Shropshire lambs are hardy, vigorous and meaty. They produce good overall profit.

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They have a hard and resilient grey fleece, historically used as carpet wool; these carpets are sold under the auspices of the National Trust. The sheep are also favoured by farmers for their sparse but strong-flavoured meat.

They are well adapted to the harsh terrain and climate in which they typically live. Most sheep spend winter on the fells. They are normally left to graze freely on the hillsides, but tend to stay in their heaf, the natural home to which the flock will return every year.

The merino is an excellent grazer and very adaptable. It is bred predominantly for its wool, and its carcass size is generally smaller than that of sheep bred for meat.


Herdwicks

Herdwicks

ANSWER THE FOLLOWING QUESTIONS IN FULL SENTANCES

  • What is the wool of the Herdwick traditionally used for?

  • What is the main quality associated with their meat?

  • What type of conditions are Herdwicks famed for being able to live in?

  • If a farmer decided he wanted more meat which breed of sheep might he cross his Herdwick with?

  • If the farmer wanted to go into quality wool production which breed might he use?


Herdwicks1

Herdwicks

ANSWER THE FOLLOWING QUESTIONS IN FULL SENTANCES

  • What is the wool of the Herdwick traditionally used for?

  • What is the main quality associated with their meat?

  • What type of conditions are Herdwicks famed for being able to live in?

  • If a farmer decided he wanted more meat which breed of sheep might he cross his Herdwick with?

  • If the farmer wanted to go into quality wool production which breed might he use?


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