Barry York

studbook.co.za

Barry York

Prospects for game with the

application of production recording.

Barry York


Conserving our wildlife.


Why Wildlife?

“The keeping of animals that are in harmony

with the environment in which they are

maintained brings about maximum utilization of

natural resources”

Professor Jan Bonsma (Man must measure).


Wildlife has evolved mainly

due to Natural Selection


Understanding Genetics

“The effect of a dominant allele (B) is seen in the black puppy

even if it is present with a contrasting recessive allele (b).”

Because a gene is dominant, this does not

necessarily make it good or bad!


Polled Cattle - Dominant Gene

PP = Poled cattle

Pp = Poled cattle

pp = Horned cattle


Dexter Cattle - Dominant Gene

A bulldog calf is a deformed

aborted fetus and in the past

has been a genetic-related

problem in a number of cattle

breeds, especially Dexters.


Multiple or Polly Genes

Human skin colour


Bell Shaped Curve


SELECTION CRITERIA FOR EFFICIENT

WILDLIFE PRODUCTION

SELECTION AIM: “The prime aim of selection is to identify superior

animals and use them for breeding so that the

efficiency and profitability of the herd is improved.”

CHOICE OF SELECTION TRAITS:

Fertility – calving ease and calf survival

Hide and hair colour – colour variants

Horn growth or trophy size

Growth rate– venison production


Fertility – amongst cows

Brahman and Jersey cows: The body profile of the sterile or sub

fertile cow (Left) and the highly fertile cow (right).


Fertility – amongst Bulls

A

A

B

A = Bull with low fertility

B

B

= Bull with high fertility


Hide and hair colour

7-8% of the live mass of an animal


Percentage sun light reflected

Different coat colour amongst Afrikander cattle


Buffalo keeping cool in the shade.


Golden Wildebeest's shinny hide reflecting heat rays


Un-adapted cattle


White Wildebeest


White Wildebeest


White Lion

Select on pigmentation

not just fur colour


Shifting the average of the curve


Measuring Wildebeest Horns RW


Measuring Wildebeest Horns SCI


Horn growth or trophy size

The influence of sex hormones on hair, muscular

development and skeletal growth is shown on three

animals, all 12 years old.

From left to right: steer castrated at six months, steer

castrated at two years and intact bull.


Body size

700

600

500

400

300

200

100

0

Gestation period of animals - Days


Select a bull with a holistic approach

1. The more traits you

select for the more

difficult it is to

achieve your goal.

2. Select for criteria that

takes your specific

breeding project

forward.

3. Keep a balanced

approach


Age of sexual maturity in bulls

Signs:

GNUNGG

Flehmen response


“Golden Wildebeest bulls contribute over 80% of

the genetic progress in a herd. Selection of top

quality breeding bulls is therefore of vital

importance to any breeding program.”


Breeding Plans


Inbreeding


Line Breeding


How to shift the mean?

Corrective mating

Assorted mating (Best to Best)


“Golden Breeders Breeding plan”


Identify the best young Golden Bulls!

2012 “Veld-Bull-Test”


Selecting the best young Golden Bulls!


The top 5 performance tested bulls from 2012

are now in their own individual breeding herds


“Golden Breeders Breeding plan”


Analyse data of progeny and

performance of calves


“Golden Breeders Breeding plan”


Selecting Elite Heifers – From Breeding Herds


Age at first calving and mothering

ability!!


Shifting the mean


Make the correct breeding choices


THE WAY FORWARD

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