Population Management in Animal Science: Reproduction, Selection, and Ethics

Reproductive maturity

The point at which an animal is capable of producing viable gametes and supporting reproduction.

Reproductive readiness

An animal's state of being physically developed, healthy, and managed for successful breeding.

Endocrine system

System responsible for regulating reproductive maturity, particularly the hypothalamus–pituitary–gonadal axis.

Seasonal breeders

Species whose reproductive cycling is affected by the length of day.

Body condition score (BCS)

A measurement used to assess an animal's body fat and overall health.

Breeding soundness exam (BSE)

An assessment of a male animal's reproductive health and ability to breed.

Phenotype

The observable characteristics of an animal, influenced by genetics and environment.

Breeding value (BV)

The genetic value of an individual as a parent based on additive genetic effects.

Estimated breeding value (EBV)

A data-based estimate of an animal's breeding value that incorporates performance records.

Heritability

The proportion of variation in a trait due to additive genetic variation within a population.

Breeder's equation

An equation predicting response to selection: R = h^2 × S.

Dystocia

Difficult birth caused by fetal or maternal factors.

Heat (estrus) synchronization

Hormonal manipulation to align the estrous cycles of females.

Sex-sorted semen

Semen processed to increase the likelihood of offspring being male or female.

Nutritional flushing

A short-term increase in energy intake before breeding to improve reproductive outcomes.

Embryo transfer (ET)

The process of placing embryos from a donor female into recipient females.

Natural breeding

Mating without using advanced reproductive technologies.

Cloning

Creating a genetically identical copy of an organism.

Spaying

Surgical removal of reproductive organs in female animals.

Neutering

Removal or disabling of reproductive function in male animals.

Relocation

Movement of animals to different areas to reduce conflict or pressure.

Culling

Selective removal of animals from a population to manage its size or health.

Gestation

The period from conception to birth.

Dystocia warning signs

Indicators such as prolonged straining, exhaustion, or abnormal discharge that suggest difficult birth.

Colostrum

The first milk produced after birth, critical for passive immunity in neonates.

Genetic merit

The inherited ability of an animal to pass traits to its offspring.

Contemporary group

A group of animals compared under similar management conditions.

Trade-offs in selection

The balancing of desirable and undesirable traits when breeding.