Changes

Hypothyroidism in foals is usually associated with prognathism, ruptured tendons, forelimb contracture, delayed ossification of the carpal and tarsal bones, and goitre. The prognosis is extremely poor. <br><br>

Hypothyroidism in foals is usually associated with prognathism, ruptured tendons, forelimb contracture, delayed ossification of the carpal and tarsal bones, and goitre. The prognosis is extremely poor. <br><br>

The clinical signs of hypothyroidism in adult horses are cessation of growth, hypothermia, lethargy, irregular areas of alopecia and thickened face.

The clinical signs of hypothyroidism in adult horses are cessation of growth, hypothermia, lethargy, irregular areas of alopecia and thickened face.

|l1=

|l1=Hypothyroidism

|q2=Which three thyroid hormones can you name, and how are they controlled?

|q2=Which three thyroid hormones can you name, and how are they controlled?

|a2=

|a2=

There is a slight diurnal variation in thyroid hormone concentrations with low concentrations during the night. <br><br>

There is a slight diurnal variation in thyroid hormone concentrations with low concentrations during the night. <br><br>

Thyroid hormones regulate cell growth and differentiation, and regulate energy metabolism.

Thyroid hormones regulate cell growth and differentiation, and regulate energy metabolism.

|l2=

|l2=Thyroid Gland - Anatomy & Physiology#Thyroid Hormone Physiology

|q3=Does diet influence the plasma concentrations of these hormones?

|q3=Does diet influence the plasma concentrations of these hormones?

|a3=

|a3=

*Serum thyroid hormone concentrations are decreased following concurrent disease and the administration of phenylbutazone (T4 only).  

*Serum thyroid hormone concentrations are decreased following concurrent disease and the administration of phenylbutazone (T4 only).  

*However, the administration of dexamethasone does not change baseline T3 and T4 concentrations.

*However, the administration of dexamethasone does not change baseline T3 and T4 concentrations.

|l3=

|l3=Thyroid Gland - Anatomy & Physiology#Influence of External Factors

|q4=What is the euthyroid sick syndrome?

|q4=What is the euthyroid sick syndrome?

|a4=

|a4=

*Disease unrelated to thyroid disease can depress basal thyroid hormone levels as a normal response to minimize the catabolic effects of thyroid hormone during disease.  

*Disease unrelated to thyroid disease can depress basal thyroid hormone levels as a normal response to minimize the catabolic effects of thyroid hormone during disease.  

*In cases of euthyroid sick syndrome, low baseline T3 and T4 concentrations respond normally to TSH administration.

*In cases of euthyroid sick syndrome, low baseline T3 and T4 concentrations respond normally to TSH administration.

|l4=

|l4=Hypothyroidism

 

 

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