How long for a total new hoof to grow?

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It is generally accepted that the rate of growth of new hoof wall is roughly 1cm monthly, if the horse is on good nutrition. That equates to over one year for a totally new hoof wall to develop
 
If hoof is balanced, diet is good and sensible amount of exercise utilities takes approx 9 months to grow from top to bottom and 3 months for sole heel to toe. But generally the hoof grows slower in winter asd faster in summer . X
 
The rate of hoof growth is considerably faster in young horses than in adults. The foot of a nursing foal, for example, grows at a rate of about 0.6 inches (15 mm) per month. As the horse matures, the rate slows; yearling feet grow about 0.48 inches (12 mm) per month.

Other than youth, what might affect the rate at which a horse's hooves grow? There are a number of considerations, including:

External temperature--Mid-winter cold tends to slow hoof growth; the rate accelerates in the spring.
Environmental moisture--Extremely dry conditions retard hoof growth. Generally speaking, hooves grow faster in soggy Seattle than they do in the Arizona desert.
Genetics--Some breeds are well-known for the quality and denseness of their hoof horn (Arabians and many pony breeds, for example), while others are recognized for often having poor-quality feet (Thoroughbreds in particular). There is a great deal of variation within each breed, however, and environment can play a large role.
Illness and fever--High body temperatures might retard or deform hoof growth so that several months later, the horse exhibits "fever rings" on his hooves.
Injury to the coronary band--When these generative tissues are damaged, the resulting hoof wall from that area might also be damaged or grow more slowly.
Weight-bearing on other feet--If a horse suffers a severe lameness in one leg such that he puts no weight on it, the hoof growth of the opposite leg, which bears all the weight, will be slower than normal. This might also produce distortions in the hoof capsule.
Exercise--When a horse begins training for an athletic task, his metabolic rate will increase, and hoof growth will accelerate along with it.
Nutrition--This is a crucial consideration, because several dietary elements need to be in place in order for the horse to grow good-quality hoof horn. If the horse is deprived of any of these nutrients (more on these in the next section), the hoof will grow more slowly and the horn produced will be ill-equipped to support the horse's weight and retain its integrity.

(Courtesy of Prince Albert Stables)
 
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