ANSC 313 Lecture Notes - Lecture 16: Churro, Heritability, Lamb And Mutton
LECTURE 17
Sheep!
sheep terminology!
male= ram!•
female= ewe!•
young= lamb!•
1-2 year old= hogged!•
castrate= wether!•
!
Sheep improvement!
1800- 1-1.5 kg of fleece per sheep!•
1950- 3.85 kg of fleece per sheep!•
merino!•
fine wool!◦
trade embargo out of spain until 1800!◦
!
Wool fibre!
wool fabric was found in Egypt in 4000 BC!•
once 2/3 of British trade!•
!
sheep were imported to North America in 1540 via mexico- churro sheep!
by 1638 woven good from sane fe were traded with mexico!
pueblo indians adopted wool for weaving!◦
navajo indians adopted wool in 1750`s!◦
in 1853, Kit Carson took a flock of 6,500 sheep to California by the sane fe trail!
!
Hudson`s Bay blankets!
points indicate the size of the blanket!•
important in the canadian fur trade for beaver pelts!•
introduced in 1780!•
capotes were coats made from these blankets !•
!
Singl gene traits!
wool color!•
white if to mills!◦
several in AB & BC & Maritimes!‣
none in SK!‣
coloured if for local spiders & weavers!◦
spider syndrom!•
autosomal recessive!◦
Suffolk & hampshire!◦
there is a DNA test now!◦
!
traits of economic importance!
fertility 0.05-0.10 heritability!•
testical size is good indicator of fertility!•
twinning not considered a disadvantage!•
higher in come breeds:!◦
suffolk!‣
