I need Comb help....

[erner]

So heres the deal. I have a public speaking class at my homeschool co-op, and I am writing an informative speech on chiken combs, So I need the origin, and maybe the story behind Single combs, Pea combs, and buttercup combs, if possible. The stuff behind the other type of combs would be OK too. So I will keep looking, and hopefully one of you will have an answer too, but even if you don't, that's OK too. And no Wikipedia. My teacher says it is 'unreliable', as it can get changed and edited.

 

[banjoejoe4783]

i can not help muck with origane of the combs but i will share some of what i know

comb typs
singale
rosse
pea
walnut
straberry
cushon
buttercup
V


the singale comb is the resolt of having no dominant geans the roos is a dominat as is the pea but when you have rosse and pea you will get the walnut comb ( one rosse comb parent/one pea comb parent = walnut comb ofspring )

the butter cut comb is the resalt of 2 side by side singal combs that where breed till the combs jioned togather

wish i could help you more but i know more about geenetics of combs then history

 

[Chris09]

Here you go---

Comb:
The fleshy protuberance on top of the head of a fowl, larger on the male than the female. Of various forms and variations of forms in different breeds, usually red in color; purple in Sumatras, Birchen and Brown Red Modern Games and Silkies, purplish-red in Seabrights.
Buttercup:
Consists of a single blade arising at the juncture of the head and beak rising up and slightly back to the cup shaped crown, set squarely on the center of the skull. The rim of the cup shall bear an evenly spaced circle of points and be closed at the back. Points emerging from the center of the cup are a serious defect, (Fig. 17).
Cushion:
A low, compact comb of relatively small size, it should be quite smooth, possess no depressions or no spikes and not extend beyond the mid point of the skull, (Fig. 16).
Pea:
A medium length, low comb, the top of which is marked with three low lengthwise ridges, the center one slightly higher than the outer ones, the top of which are either undulated or marked with small rounded serrations, (Fig. 14);
Rose:
A solid, broad, nearly flat on top, low fleshly comb, terminating in a well developed tapering spike, which may turn upward as in Hamburgs; is nearly horizontal as in Rose Comb Leghorns; or follow the contour of the head in Wyandottes. Top surface of the main part should be slightly convex and studded with small rounded protuberances. General shape varies in different breeds (Fig. 13).
Silkie:
An almost round, somewhat lumpy comb, inclined to be greater in width than length; covered with small corrugations on top and crossed with a narrow, transverse indentation slightly to front of the middle of comb. Sometimes two or three small rear points hidden by crest, others without points. Generally considered to be genetically a rose comb, changed by rose comb plus crest.
Single:
A moderately thin, fleshy formation of smooth soft surface texture, firmly attached from the beak along the top of skull with a strong base, the top portion showing five or six rather deep serrations or distinct points, the middle points being higher than the anterior or posterior, forming a semi-oval when viewed in profile. The comb always erect and much larger and thicker in male than female; may be lopped or erect in female, depending on breed. The comb is divided into three sections, the front or anterior, the middle, and that extending past the rear base of the skull, the posterior or blade, (Fig. 12).
Strawberry:
A low set, compact comb of somewhat egg shape with the larger portion forward and the rear extending no further than the midpoint of the skull, (Fig. 18).
V-Shaped:
A comb formed of two well defined, hornlike sections joined at their base, (Fig. 15).
Walnut:
A solid, moderately broad comb resulting from the combination of two dominant alleles for the Rose (R) and Pea (P) comb, with a surface that shows some furrowing reminiscent of a walnut half.

Genetics of comb type:

Comb type in chickens is due to two genes, the rose comb gene, R, and the pea comb gene, P. These two genes are on different chromosomes. The lack of these genes is represented with lower-case letters, r and p. More correctly stated, r and p (or r+ and p+ to indicate they are the wild-type genes) are the genes that replace R and P when they are not present. A chicken with a single comb is lacking both R and P genes and so could be represented as (r, r) for rose comb and (p, p) for pea comb. Some authors will combine this ‘notation’ and write (rrpp) to represent the genes for single comb. I prefer the first way of writing the genes for the purposes of this text.

A chicken with a rose comb will have one of the gene combinations: (R, R) with (p, p), or (R, r) with (p, p). A bird with a pea comb will have (r, r) with (P, P), or (r, r) with (P, p). Since one copy of the rose or pea gene is sufficient for that comb type, these genes can be thought of as dominant. However, they act together to create the walnut comb when both rose and pea comb genes are present.

Poultry with a walnut comb have at least one copy of both the rose comb gene and the pea comb gene. The gene combinations that give walnut comb are: (R, R) with (P, P), (R, r) with (P, P), (R, R) with (P, p) and (R, r) with (P, p).

To explore the genetics of comb type, let’s cross a pea comb chicken, (r, r) with (P, p), and a rose comb chicken, (R, r) with (p, p). Because two genes on different chromosomes are involved, there is more bookkeeping than if there were only one gene involved, but the principle is the same and no more difficult. We first have to consider the combinations of the rose comb genes of the two parents, then the combinations of the pea comb genes of the two parents. Then we realize that each of the rose comb combinations can occur with each of the pea comb combinations. In the end there are 16 combinations in all.

The four possible combinations for the rose comb genes from the two parents are: (R, r), (R, r), (r, r) and (r, r). The four combinations for the pea comb genes from the two parents are: (P, p), (P, p), (p, p) and (p, p). Since each of the four rose comb combinations can occur with any of the pea comb combinations, we now have to consider each of the rose comb combinations with each of the pea comb combinations (16).

The figure above shows how to make a helpful drawing. Make a list (column) of the four rose comb gene combinations on one side and the pea comb genes on the other side. The combinations of the first rose comb gene pair with all the pea comb gene pairs is shown in the figure by the connecting arrows. Considering the (A, a) of the drawing to be (R, r), the possible combinations of the first rose comb gene pair with the pea comb gene pairs are: (R, r) with (P, p) twice [we get this combination twice], and (R, r) with (p, p) twice. The second rose comb gene pair with the pea comb genes gives the same combinations: (R, r) with (P, p) twice and (R, r) with (p, p) twice. The third rose comb gene pair with the pea comb gene pairs gives: (r, r) with (P, p) twice and (r, r) with (p, p) twice. The last rose comb gene pair with the pea comb gene pairs gives the same: (r, r) with (P, p) twice and (r, r) with (p, p) twice.

So, of the 16 possibilities, four of them are (R, r) with (P, p) and is walnut comb, four are (R, r) with (p, p) and is rose comb, four are (r, r) with (P, p) and is pea comb, and four are (r, r) with (p, p) which is single comb. We have four out of 16 chances (25% chance) to get a walnut comb from this cross, four out of 16 chances to get rose comb, four out of 16 chances to get pea comb and four out of 16 chances to get single comb.
Genetics of comb type from http://sellers.kippenjungle.nl/page2.html#t9

Chris