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A roan bull and a roan cow can indeed breed to have red and white cattle. This is due to alleles mixing.

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Q: Can a roan bull and a roan cow have a red and white cattle?
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Which cross will produce only horned roan offspring in cattle?

The cross that will produce only horned Roan offspring in cattle is the red bull with the white cow. However, these offspring would be able to create either red, white, or Roan.


When roan color in cattle is the result of incomplete dominance between red and white color genes how would one produce a herd of pure breeding roan colored cattle?

It's simply not possible. When you breed a roan cow to a roan bull you only have a 50% chance of producing roan offspring, a 25% chance of producing white offspring and a 25% chance of producing red offspring. You have a much higher chance of producing a pure breeding red or white herd than a roan-coloured herd.


Could a roan cow and a white cow have calves which are red?

Nope. And here's why:Answer #1: A cow cannot produce offspring with another cow. Just like sexual intercourse between two women cannot nor will not produce a baby. So, in order to produce a calf, we need to put a BULL into the equation, and remove one of the cows. Which one, you ask? I say it's up to you. But remember this: Bulls contain semen which contain sperm which are able to travel to the embryo (after being ejaculated into the female) and fertilize it by natural fusion and create a baby calf. Now that we have sorted that out, lets tweak the question a bit:Could a roan cow and a white bull (or a roan bull and a white cow) have calves which are red?Now from here, I can properly answer the question in the second part below. Answer #2: Using a Punnett square (you can draw one on a piece of paper as I cannot do one on here), you have the coat colour genes from the Roan Cow which are symbolized as RW for Red & White as Roans are animals that have red and white hair intermixed together. This is what is referred to as a Codominant Gene. Next, you have the genes from the White Bull which are symbolized as WW since the bull has white hair. Now draw your Punnett square and you will get the following chance of coat colouration in the resulting calves:50% chance of white calves50% chance of roan calves0% chance of red calves.So the answer to this question remains: No, you cannot possibly have red calves when a roan cow is bred to a white bull (or a roan bull is bred to a white cow).


What would be the offspring be if a roan cow and a white bull were bred together?

The offspring produced is dependent on chances. We can figure out the chances of the kind of offspring such a cross will get by using a Punnett square. Unfortunately the WYSIWYG format on this site will not allow for such a square, so we will give the ratio, the genotypic and phenotypic percentages that such a cross will receive. Let R = red, W = white and RW = roan. Roan cow (RW) x White bull (WW) Offspring: 2 RW : 2 WW Genotypic ratio: 50% roan and 50% white Phenotypic ratio: Same as above. Thus, the offspring of a roan cow crossed with a white bull (presumably of the same breed, being Shorthorn), may come out as white or roan. There is a 50% chance that either will occur.


Can a black cow and a bull have a white calf?

No. Black is a dominant colour, no matter what colour the bull is. If the bull is white, the calf will be grey. If a bull is black, the calf will be black; if a bull is a blue roan, the calf will be most likely a darker roan or even black; if a bull is red or brown, the calf will be black; if a bull is yellow or orange the calf will be either grey or black.


Do red cows and blue cows make purple cows?

No they don't. Besides, two cows that mate cannot produce offspring. Either one or the other has to be a bull, not another cow. See, cow + bull = calf. Besides, blue cattle don't exist, if you're not including the blue roan colouration. If you are, then a blue-roan cow bred to a red bull would likely produce a black calf, or even a speckled-roan calf. But never a purple calf.


A cross of a red cow RR with a white bull WW produces all roan offspringer RRWW this type of inheritance is known as?

Codominance.


What would the offspring be if 2 roan cows were crossed?

There wouldn't be any offspring. A cow cannot mate with a cow to get a calf. You must mate a cow with a BULL to get a calf. So, if the question were reworded to: "What would the offspring be if a roan cow was crossed with a roan bull?" or vice versa, then we could answer it this way: Roan colouration in Shorthorns is a codominant trait, which means that one allele is not dominant nor recessive over another. So, the resulting offspring of a roan cross would be a mix of red calves, white calves, and roan calves. The Punnet Square reveals the probability of one of three coat colours occurring in the subsequent cross: Let R = red and W = white and RW = roan. RW bull x RW cow gives us: 1 RR 2 RW 1 WW In other words, there's a 25% chance that the resulting calf would be red, a 50% chance that the resulting calf would be roan, and a 25% chance that the calf could be white.


What is the ratio of red roan white offspring from the cross of a roan bull with a white cow?

Lets start with using letters to symbolize each allele of each parent: Roan Bull x White Cow --> Rr x rr (where the alleles R = red and r = white). The resulting ratio of offspring is the following: Rr = 50% rr = 50% RR = 0% Since there are too many little "r"'s and not enough big "R"'s, we can only get a cross of white and roan calves to a ratio of 1:1. Red calves do not exist in this cross.


How many years does it take for a cow to become a bull?

A cow will never become a bull because cows are female cattle and bulls are male cattle.


What coat color known as roan can occur when a white cow and a red bull are crossed when looking closely you can see red and white individual hairs this is an example of a?

Codominance or Incomplete dominance.


When roan color in cattle is the result of incomplete dominance between red and white color genes how would one produce a herd of pure-breeding roan-colored cattle?

Genetics is a tricky thing and there are no 100% guarantees that you will get the color you want. That being said the best possible way that this might be achieved would to test the genetics of each breeding pair. And continue to breed a successful pair, but have a care not to over breed them. A roan will not necessarily produce another roan either. Any born not of the color you want test to make sure of the genetics and decide to keep and breed or sell. It would take years of careful screening, breeding, trials and errors and disappointments. But with patience and persistence I believe that it would be possible. :)