**These pages are made only for our farm to go and remind ourselves what we need to do.
We have been collecting these files over the years.
We are always learning new information. We add and edit these files almost daily.
We have been collecting these files over the years.
We are always learning new information. We add and edit these files almost daily.
Genetics with Mini Nubians
About G6S (G6S deficiency) in Nubian blood
G6S-deficiency is a genetic recessive disorder affecting Nubians and Nubian crosses including Mini Nubians. Each goat has two copies of the G6S gene inherited by its parents. G6S-deficiency is caused when both of these copies are mutated and cannot function normally.
For a goat to be affected, both parents must be carriers of the G6S gene. In the future, other breeders may want to see your goat’s G6S status. Please keep this sheet and the included test results for your records.
What does a “Normal,” “Carrier,” or “Affected” result mean?
Normal result (G6S-normal)
Neither of the two alleles of the goat is a mutated G6S gene. This means that the goat possesses only normal copies of the G6S gene and therefore does not have G6S-deficiency. Breeding two G6S-normal goats will result in a G6S-normal offspring. This is the ideal result.
Carrier result
A goat that is a carrier possesses one copy of a normal G6S gene and one copy of the mutated G6S gene. The presence of the mutated gene means that one of this goat’s parents must also have a copy of the mutated gene. Although a carrier goat will appear and function normally, problems can arise in offspring if it is bred because they are capable of passing down their mutated G6S gene to their offspring.
For example: Let “G” be a normal copy of the G6S gene, and “g” be the mutated copy of the G6S gene. A carrier’s gene is Gg because it has one copy of each.
If one parent normal (GG) and the other is a carrier (Gg), the offspring will be have a 50% chance of being normal (GG) or a carrier (Gg). These percentages are represented in the diagram below. The shaded boxes represent the parents
For a goat to be affected, both parents must be carriers of the G6S gene. In the future, other breeders may want to see your goat’s G6S status. Please keep this sheet and the included test results for your records.
What does a “Normal,” “Carrier,” or “Affected” result mean?
Normal result (G6S-normal)
Neither of the two alleles of the goat is a mutated G6S gene. This means that the goat possesses only normal copies of the G6S gene and therefore does not have G6S-deficiency. Breeding two G6S-normal goats will result in a G6S-normal offspring. This is the ideal result.
Carrier result
A goat that is a carrier possesses one copy of a normal G6S gene and one copy of the mutated G6S gene. The presence of the mutated gene means that one of this goat’s parents must also have a copy of the mutated gene. Although a carrier goat will appear and function normally, problems can arise in offspring if it is bred because they are capable of passing down their mutated G6S gene to their offspring.
For example: Let “G” be a normal copy of the G6S gene, and “g” be the mutated copy of the G6S gene. A carrier’s gene is Gg because it has one copy of each.
If one parent normal (GG) and the other is a carrier (Gg), the offspring will be have a 50% chance of being normal (GG) or a carrier (Gg). These percentages are represented in the diagram below. The shaded boxes represent the parents
GG takes up 50% of the offspring boxes, and Gg takes up the other 50%. However, since both normal and carrier goats appear and function normally, 100% of this pair’s offspring will be outwardly normal.
Below is a diagram for the cross between two carrier (Gg) goats.
Below is a diagram for the cross between two carrier (Gg) goats.
In this case, there is a 25% chance for the offspring to be normal, a 50% chance for it to be a carrier, and a 25% chance for it to be affected completely by the mutation.
Outwardly, 75% of the offspring are expected to appear and function normally.
It is important to note that this probability is reset for each instance of mating/breeding. Each offspring has the same probability. A doe from the diagram above with quadruplets will not necessarily give birth to one normal, two carrier, and one affected goat.
Affected result (G6S-positive)
A G6S-deficiency positive goat possesses two copies of the G6S mutation (gg), and therefore, the goat is affected by the G6S-deficiency disorder.
We can test each of Mini Nubian goat easily with discounted price through MDGA at
US Davis now.
Outwardly, 75% of the offspring are expected to appear and function normally.
It is important to note that this probability is reset for each instance of mating/breeding. Each offspring has the same probability. A doe from the diagram above with quadruplets will not necessarily give birth to one normal, two carrier, and one affected goat.
Affected result (G6S-positive)
A G6S-deficiency positive goat possesses two copies of the G6S mutation (gg), and therefore, the goat is affected by the G6S-deficiency disorder.
We can test each of Mini Nubian goat easily with discounted price through MDGA at
US Davis now.
How to do
1) Read the testing guide
2) Apply it through online at MDGA & pay through PayPal for $35
3) MDGA will send you the testing information (Kit) by email
4) Print out the information kit
5) Take a clean plier with a small envelop with you and pull out about 40 hair from the root of the tail area (one of the longest hair) with the root attached. Place them into the paper envelop.
5) Stick the paper envelope with hair onto the information kit.
6) Place the paper envelop with hair & the information kit into the envelop that you are planning to send to UC Daves.
7) Send it by USPS with normal postage
1) Read the testing guide
2) Apply it through online at MDGA & pay through PayPal for $35
3) MDGA will send you the testing information (Kit) by email
4) Print out the information kit
5) Take a clean plier with a small envelop with you and pull out about 40 hair from the root of the tail area (one of the longest hair) with the root attached. Place them into the paper envelop.
5) Stick the paper envelope with hair onto the information kit.
6) Place the paper envelop with hair & the information kit into the envelop that you are planning to send to UC Daves.
7) Send it by USPS with normal postage
The genetics behind Blue eyes & Polled goats
by Thrifty Homesteader
by Thrifty Homesteader
How to tell whether baby goats are horned or polled?
by Better hens & Gardens