|
UPGRADING
GUIDELINES
Revised, March 2003
.pdf document
Item I - OBJECT
A. The North American Wensleydale Sheep Association
(NAWSA) supports the development of purebred white and colored Wensleydale
sheep from the crossing of specific non-Wensleydale ewes with purebred
Wensleydale rams. The first generation (50%) blood bred back to
a purebred Wensleydale sire produces a 75% blood. A second generation
(75% blood) female, bred back to a purebred Wensleydale sire produces
an 87% blood, the fourth generation produces 93%, and a fifth generation
produces 96%.
Item II - FOUNDATION EWES
The non-Wensleydale ewes used in the first
cross must
be registered with one of the following U.S. breed
associations. No other foundation breeds shall be
recognized.
- Cotswold
- American Cotswold Record Association,
Cotswold Breeders Association, Black Cotswold Society
- Leicester Longwool
- Leicester Longwool Sheep
Breeders Association
The NAWSA strongly discourages the use of Leicester Longwools
due to their low population in the U.S.
- Lincoln - National
Lincoln Sheep Breeders Association
Item
III - PROCEDURES
A. There is no discrimination or separation
of record keeping for colored animals. Fleece color and Codon 171
status, if known, will be noted on the registration certificate.
Fleece color will be indicated by a suffix to the registration number.
White-fleeced animals will be identified by the suffix W,
and animals other than white will be identified with suffix C.
B. All first cross lambs must be sired by
use of imported 100% Wensleydale semen. Ewe lambs from this cross
will be registered as 50% Wensleydale. First cross male lambs will
not be registered All rams must be at least 75% Wensleydale blood
and test RR at codon 171 to be eligible for registration.
C. A sire must be registered as 75% Wensleydale
or higher before any progeny are eligible for registration.
D. Lambs will
be registered with their blood percentage calculated from the use
of two registered parents, i.e. 50% dam crossed with a 75% sire
results in a 62% lamb. If this lamb is male, it is not eligible
for registration. (Refer to Item III B).
E. Rams with 75% to 95% Wensleydale blood
and Ewes with 50% to 95% Wensleydale blood will be issued registration
numbers with the prefix B.
F. An animal of either sex will be considered
a purebred American Wensleydale when their percentage meets or exceeds
96% (31/32) Wensleydale blood. Sheep submitted for NAWSA purebred
status must meet the breed standards set forth by the Wensleydale
Longwool Sheep Breeders Association, U.K.
G. The NAWSA has set codon 171 standard for the
use of imported semen, and beginning January 1, 2000, only semen
from rams testing RR at codon 171 will be eligible to sire recorded
or registered animals. The only exception to this rule is Upper
Mill Cracker, a colored ram that has already been imported and used
in the United States. This ram has tested QR at codon 171.
Item IV - DETERMINING PERCENTAGE
The sire and dam Wensleydale percentages are added
together and divided by two. The resulting figure is truncated to
whole numbers (e.g. 87.5 becomes 87). This number is the percent
Wensleydale of the lamb.
An animal is eligible for registration as
follows:
- Ram 75-100% (must test RR at codon 171)
- Ewe 50-100%
|