Dairy Cattle Breeding & Selection (1) - PowerPoint PPT Presentation

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Dairy Cattle Breeding & Selection (1)

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The inter-relationship between the Endocrine system and the Nervous system. The origin and function of the major hormones involved with reproduction. – PowerPoint PPT presentation

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Title: Dairy Cattle Breeding & Selection (1)


1
Dairy Cattle Breeding Selection
A cow is a very good animal in the field,
but we turn her out of a garden
2
Reproduction Endocrinology
  • The inter-relationship between
  • the Endocrine system
  • and the Nervous system.
  • The origin and function
  • of the major hormones involved with
  • reproduction.

3
Look at the Two systems
  • Endocrine System
  • It Causes slower and longer lasting changes
    within the body.
  • Examples
  • 1) Growth
  • 2) Reproduction
  • 3) Lactation
  • 4) Secondary Sex Characteristics

4
Look at the Two systems
  • Nervous System
  • It Causes rapid changes and/or adjustments
    within the body.
  • Examples
  • 1) Immediate reaction to any kind of stress such
    as
  • a) Pain
  • b) Fear
  • c) Heat
  • d) Exertion

5
Two systems work together as one system
  • 1. Called the Neuroendocrine System.
  • a. Referred to this way
  • because of the overlapping
  • effect each system has on the other.
  • b. Example Adrenaline will
  • cover up the effects of oxytocin.

6
Look at the Two systems
  • 1. Hormone Chemicals synthesized from the
    endocrine glands that influence activities of
    other organs within the body.
  • Example The ovary produces estrogen,
    progesterone, and relaxin, all of which affect
    the body in different ways.
  • 2. Neurohormone Chemicals synthesized in the
    central nervous system (or in the neuron nerve
    cell) that influence activities of other organs
    within the body.
  • Example FSH, LH (both produced in the anterior
    pituitary gland) and Oxytocin (produced in the
    posterior pituitary gland)

7
Hormone Secretions in the Female are
brought about in two ways.
  • A. External effects (Conditions occurring
    outside the body i.e. Environment)
  • 1. Temperature changes Extreme heat for
    example will cause the blood to circulate faster.
  • 2. Improper handling of cattle causes the system
    to speed up due to adrenaline secretions.
  • B. Internal Affect (Conditions occurring inside
    the body i.e. Estrous Cycle)

8
Subgroups In Cattles
  • Bos Indicus (American by way of India)
  • Heat tolerant
  • Increased parasite disease tolerance
  • Improved production in subtropical climates
  • American Influenced
  • 2) Bos Taurus (European and British)
  • Maternal and(or) terminal breeds
  • Positive carcass traits marbling,tenderness,
    yield
  • Excellent production in temperate climates

9
British Breeds
  • Angus
  • Hereford
  • Polled Hereford
  • Shorthorn
  • Red Angus

10
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