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Genetic Diseases in Cattle

Introduction

Genetic diseases in cattle are inherited disorders caused by mutations affecting structural proteins, enzymes, immune function, metabolism, or nervous system development. Many economically important cattle diseases have become more common due to intensive selective breeding and widespread use of elite sires through artificial insemination. Recognition and genetic screening are critical for herd health and breeding management.

General Characteristics of Genetic Diseases in Cattle
  • Often inherited as autosomal recessive traits
  • Carrier animals may appear clinically normal
  • Can affect productivity, fertility, growth, immunity, and survival
  • Some conditions result in embryonic death or abortion
Importance in Veterinary Practice
  • Economic losses from calf mortality and reproductive failure
  • Reduced herd productivity
  • Breeding program complications
  • Animal welfare concerns

1. Bovine Leukocyte Adhesion Deficiency (BLAD)

Definition

Bovine Leukocyte Adhesion Deficiency (BLAD) is a fatal inherited immunodeficiency disease of Holstein cattle characterized by defective neutrophil function and severe recurrent infections.

Breed Affected
  • Holstein cattle
Etiology
  • Autosomal recessive mutation in the CD18 gene
  • Defect affects leukocyte adhesion molecule formation
Pathogenesis
  • Neutrophils cannot adhere to blood vessel walls properly
  • Impaired migration of white blood cells into tissues
  • Failure of effective inflammatory response
  • Severe susceptibility to bacterial infections
Clinical Signs
  • Recurrent pneumonia
  • Severe oral ulcers and gingivitis
  • Poor wound healing
  • Chronic diarrhea
  • Stunted growth
  • Persistent fever
Laboratory Findings
  • Marked neutrophilia
  • Poor neutrophil migration
Diagnosis
  • Clinical history of recurrent infections
  • Hematology findings
  • DNA testing for CD18 mutation
Treatment
  • No curative treatment
  • Supportive antimicrobial therapy
  • Most affected calves die early
Control and Prevention
  • Genetic testing of breeding animals
  • Avoid carrier-to-carrier mating
Summary for Practitioners

BLAD should be suspected in young Holstein calves with severe recurrent bacterial infections and persistent neutrophilia.

2. Complex Vertebral Malformation (CVM)

Definition

Complex Vertebral Malformation (CVM) is an inherited developmental defect characterized by vertebral and skeletal malformations, often leading to abortion or stillbirth.

Breed Affected
  • Holstein cattle
Etiology
  • Autosomal recessive mutation in the SLC35A3 gene
Pathogenesis
  • Defective embryonic skeletal development
  • Abnormal vertebral formation and spinal curvature
  • Multiple congenital defects develop during fetal growth
Clinical Signs
  • Abortion (often mid- to late gestation)
  • Stillbirths
  • Short neck
  • Spinal deformities
  • Contracted joints
  • Malformed limbs
Postmortem Findings
  • Malformed vertebrae
  • Scoliosis and kyphosis
  • Arthrogryposis
Diagnosis
  • Fetal necropsy findings
  • Genetic testing
  • Pedigree analysis
Treatment
  • No treatment available
Control and Prevention
  • Routine genetic screening
  • Elimination of carrier matings
Summary for Practitioners

CVM is primarily a reproductive and congenital defect problem causing significant economic losses in Holstein breeding programs.

3. Bovine Progressive Degenerative Myeloencephalopathy (Weaver Syndrome)

Definition

Weaver syndrome is a progressive inherited neurological disease causing spinal cord degeneration and incoordination in cattle.

Breed Affected
  • Brown Swiss cattle
Etiology
  • Inherited autosomal recessive neurodegenerative disorder
Pathogenesis
  • Degeneration of spinal cord white matter pathways
  • Progressive loss of nerve function
  • Impaired coordination and movement
Clinical Signs
  • Progressive hind limb weakness
  • Wide-based stance
  • Ataxia
  • Hypermetria
  • Difficulty rising
  • Muscle wasting in advanced stages
Age of Onset
  • Usually appears between 6 months and 2 years
Diagnosis
  • Clinical neurological examination
  • Breed predisposition
  • Genetic testing
Differential Diagnoses
  • Traumatic spinal injury
  • Spinal abscesses
  • Nutritional myelopathy
Treatment
  • No effective treatment
  • Progressive and incurable disease
Control and Prevention
  • Genetic screening of breeding stock
  • Avoid breeding carriers
Summary for Practitioners

Weaver syndrome should be suspected in young Brown Swiss cattle with progressive hind limb ataxia and no evidence of trauma or infection.

4. Deficiency of Uridine Monophosphate Synthase (DUMPS)

Definition

DUMPS is a lethal inherited metabolic disorder resulting in early embryonic death in cattle.

Breed Affected
  • Holstein cattle
Etiology
  • Autosomal recessive mutation affecting uridine monophosphate synthase enzyme
Pathogenesis
  • Defective pyrimidine synthesis
  • Failure of nucleic acid production
  • Embryonic cells cannot divide normally
  • Embryonic death occurs very early
Clinical Effects
  • Repeat breeding
  • Reduced conception rates
  • Early embryonic loss
Diagnosis
  • Genetic testing
  • Investigation of unexplained infertility
Treatment
  • No treatment available
Control and Prevention
  • DNA screening of breeding animals
  • Removal of carriers from breeding programs
Summary for Practitioners

DUMPS is economically important because it causes hidden reproductive losses through early embryonic mortality.

5. Factor XI Deficiency

Definition

Factor XI deficiency is an inherited blood coagulation disorder characterized by impaired clotting and prolonged bleeding.

Breeds Affected
  • Holstein cattle
  • Japanese Black cattle
Etiology
  • Autosomal recessive mutation affecting coagulation Factor XI
Pathogenesis
  • Deficient intrinsic coagulation pathway function
  • Delayed clot formation
  • Abnormal bleeding tendency
Clinical Signs
  • Prolonged bleeding after surgery or injury
  • Excessive hemorrhage during calving
  • Anemia in severe cases
  • Sometimes clinically silent
Diagnosis
  • Coagulation testing
  • Prolonged activated partial thromboplastin time (aPTT)
  • Genetic testing
Treatment
  • Supportive care during bleeding episodes
  • Blood or plasma transfusion in severe cases
Control and Prevention
  • Genetic screening
  • Careful breeding management
Summary for Practitioners

Factor XI deficiency should be considered in cattle with unexplained prolonged bleeding after routine procedures.

6. Arachnomelia (Spider Calf Syndrome)

Definition

Arachnomelia, also known as spider calf syndrome, is a congenital skeletal disorder characterized by abnormally long, fragile limbs and spinal deformities.

Breeds Affected
  • Brown Swiss cattle
  • Holstein cattle
Etiology
  • Autosomal recessive mutation affecting skeletal development
Pathogenesis
  • Defective bone maturation and ossification
  • Abnormal elongation of limbs and spine
  • Weak skeletal structure
Clinical Signs
  • Long thin limbs
  • Spinal curvature
  • Joint deformities
  • Difficulty standing
  • Fragile bones
  • Low birth viability
Postmortem Findings
  • Severe skeletal abnormalities
  • Malformed vertebrae
  • Abnormally elongated metacarpal and metatarsal bones
Diagnosis
  • Congenital skeletal abnormalities
  • Radiographic examination
  • Genetic testing
Treatment
  • No effective treatment
  • Severely affected calves usually die or are euthanized
Control and Prevention
  • Genetic screening of breeding stock
  • Avoid carrier matings
Summary for Practitioners

Arachnomelia is an important inherited skeletal defect causing severe congenital deformities and neonatal losses.

General Diagnosis of Genetic Diseases in Cattle

Diagnostic Approaches
  • Clinical examination
  • Pedigree analysis
  • Necropsy examination
  • Laboratory and coagulation testing
  • Molecular genetic testing

General Principles of Control and Prevention

  • Routine DNA testing of breeding animals
  • Use of certified disease-free sires
  • Avoid inbreeding
  • Maintain accurate breeding records
  • Genetic counseling in breeding programs
Summary for Practitioners

Modern genetic screening programs have greatly reduced the prevalence of many inherited cattle diseases in commercial herds.

Economic Importance

Genetic diseases in cattle cause major economic losses through reproductive failure, calf mortality, poor productivity, veterinary expenses, and loss of valuable breeding stock.

Summary

Important inherited diseases of cattle include BLAD, CVM, Weaver syndrome, DUMPS, Factor XI deficiency, and arachnomelia. These conditions affect immunity, skeletal development, reproduction, coagulation, and neurological function. Early diagnosis and genetic screening are essential for effective herd management and disease prevention.