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Modern poultry keeping. v.4 July-Dec. 1921.
Page 404, November 9th, 1921
https://babel.hathitrust.org/cgi/pt?id=coo.31924081082251;view=1up;seq=390
| Genetics of Egg Production. |
|[ By Major C. C. HVRST, J.P. ~_
Major Hurst has kindly sent the following replies
to letters relating to his article which recently
appeared in these columns. (Editor) :—
Live and Leam—Thanks for kind remarks.—It is
not possible to obtain 100 per cent. Double Early
(E E) Double Fast (W W) stock from the mating
of Early (E) Fast (W) pullets with a late (e)
Slow (w) cockerel. It is however possible
to obtain 100 per cent. Single Early (Ee) Single
Fast (W w) stock from that test mating which
would prove the dams to be Double Early (E E)
Double Fast (W W) for if they were not a proportion
of Early Slows (E w) Late Fasts (e W) and Late
Slews (e w) would arise from such a mating. From the
practical point of view it is important to note care-
fully that the pullets incidentally raised in this Test
mating, i.e., Single Early (E e) Single Fast (W w),
will be useful for winter layers, bub useless for the
breeding pens.
For several reasons it is impossible to compare the
L2, LI and Zero categories of the late Mr. Oscar
Smart (1917) either with the L2, LI and Zero
categories of Dr. Pearl (1912) or the E.W. categories of
the writer (1921).
For Smart's categories are somatic, i.e.. based on
external appearances, while both Pearl's and mine are
genetic, i.e.. based on internal breeding factors.
Smart's L2 pullets may be of six possible genetic constitutions, viz.:—
E.E.WW.— Ee WW—ee WW—EE Wvv-R W>
—ee Ww—and, each of the six kinds of L2 pullets
breeds differently.
Smart's LI pullets may be of nine possible genetic constitutions, viz.:—
EE WW—Ee WW—ee WW—EE Ww.—Ee Ww-
ee Ww—-EE ww—Ee.ww—ee ww. each of tie nine
kinds of LI pullets breeds differently (The first -is
of these will, however, be rather rare).
Smart's Zero pullets may be of three possible genetic
constitutions, viz.:—
ee WW,—ee Ww,—ee ww—and each of the three
kinds of Zero pullets give a different breeding
result.
Other cogent and critical points could be presented
, but it is obvious no useful purpose can be served
by comparing the somatic categories of Smart with
the genetic categories of Pearl and the writer.
( above color and bold are mine, Karen)
Wimbedey, pp. 291. Thanks for kind appreciation
of my work. (1) Double Early means that the bird is carrying two doses or a " double dose" of Each Factor (E,) having in fact received one (E) faster
from its sire and one (E) factor from its dam,
making (EE) or Double Early, i.e., a true breeding
Early, because all its germ cells carry the Early (E
factor. Single Early means that the bird is carrying
only one dose or a " single dose " of the early factor
(E) having received this either from its sire or from
its dam, but not from both, the other parent having contributed the alternative Late factor (e) making
it (Ee) or Single Early, i.e., an Early bird that do*.
not breed true to Earliness because, only one-half
of its germ cells carry the Early (E) factor, the other half carrying the Late (e) factor.
For " Double Fast" and " Single Fast" " substitute (W) for (E) above and the same explanation applies.
(2) "End of laying year is the day before" the
anniversary of the first egg laid, or 365 days from
first egg inclusive.
This is important, because if date of cessation of
laying during autumn moult be taken, the influence
of the autumn production factor (M) and its
important alternative (m) could not be determined."
Page 404, November 9th, 1921
https://babel.hathitrust.org/cgi/pt?id=coo.31924081082251;view=1up;seq=390
| Genetics of Egg Production. |
|[ By Major C. C. HVRST, J.P. ~_
Major Hurst has kindly sent the following replies
to letters relating to his article which recently
appeared in these columns. (Editor) :—
Live and Leam—Thanks for kind remarks.—It is
not possible to obtain 100 per cent. Double Early
(E E) Double Fast (W W) stock from the mating
of Early (E) Fast (W) pullets with a late (e)
Slow (w) cockerel. It is however possible
to obtain 100 per cent. Single Early (Ee) Single
Fast (W w) stock from that test mating which
would prove the dams to be Double Early (E E)
Double Fast (W W) for if they were not a proportion
of Early Slows (E w) Late Fasts (e W) and Late
Slews (e w) would arise from such a mating. From the
practical point of view it is important to note care-
fully that the pullets incidentally raised in this Test
mating, i.e., Single Early (E e) Single Fast (W w),
will be useful for winter layers, bub useless for the
breeding pens.
For several reasons it is impossible to compare the
L2, LI and Zero categories of the late Mr. Oscar
Smart (1917) either with the L2, LI and Zero
categories of Dr. Pearl (1912) or the E.W. categories of
the writer (1921).
For Smart's categories are somatic, i.e.. based on
external appearances, while both Pearl's and mine are
genetic, i.e.. based on internal breeding factors.
Smart's L2 pullets may be of six possible genetic constitutions, viz.:—
E.E.WW.— Ee WW—ee WW—EE Wvv-R W>
—ee Ww—and, each of the six kinds of L2 pullets
breeds differently.
Smart's LI pullets may be of nine possible genetic constitutions, viz.:—
EE WW—Ee WW—ee WW—EE Ww.—Ee Ww-
ee Ww—-EE ww—Ee.ww—ee ww. each of tie nine
kinds of LI pullets breeds differently (The first -is
of these will, however, be rather rare).
Smart's Zero pullets may be of three possible genetic
constitutions, viz.:—
ee WW,—ee Ww,—ee ww—and each of the three
kinds of Zero pullets give a different breeding
result.
Other cogent and critical points could be presented
, but it is obvious no useful purpose can be served
by comparing the somatic categories of Smart with
the genetic categories of Pearl and the writer.
( above color and bold are mine, Karen)
Wimbedey, pp. 291. Thanks for kind appreciation
of my work. (1) Double Early means that the bird is carrying two doses or a " double dose" of Each Factor (E,) having in fact received one (E) faster
from its sire and one (E) factor from its dam,
making (EE) or Double Early, i.e., a true breeding
Early, because all its germ cells carry the Early (E
factor. Single Early means that the bird is carrying
only one dose or a " single dose " of the early factor
(E) having received this either from its sire or from
its dam, but not from both, the other parent having contributed the alternative Late factor (e) making
it (Ee) or Single Early, i.e., an Early bird that do*.
not breed true to Earliness because, only one-half
of its germ cells carry the Early (E) factor, the other half carrying the Late (e) factor.
For " Double Fast" and " Single Fast" " substitute (W) for (E) above and the same explanation applies.
(2) "End of laying year is the day before" the
anniversary of the first egg laid, or 365 days from
first egg inclusive.
This is important, because if date of cessation of
laying during autumn moult be taken, the influence
of the autumn production factor (M) and its
important alternative (m) could not be determined."
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