Important Growth Concepts for Animal Production.

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Important Growth Concepts for Animal Production.

• Luis Nabté-Solís

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Outline
1. Introduction
2. Growth Concepts
3. Factors affecting growth
4. Conclusions
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Introduction

• Growth ? new cells. (increase in mass, not water
  increase)
• Not only cell multiplication (hyperplasia), also
  cell enlargement (hypertrophy)
• By definition, growth includes deposition of fat
  even though muscle mass is of primary interest in
  meat production.
• Mature size generally is considered the point at
  which muscle mass reaches a maximum.

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• ME NEg NEl NEy NEm HiE
• NEg energy content of the tissue deposited

(Berg and Butterfield, 1976)
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Growth curves and tissues growth rate
(Owens et al., 1993)
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(Berg and Butterfield, 1976)
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Body Composition
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Owens, et al., 1995
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Owens, et al., 1995
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(Owens et al., 1993)
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Effect of feeding level on Body Composition
(Diaz et al., 2001)
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Problem Review
(Diaz et al. 2001),
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(Diaz et al. 2001),
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Breed Effect on Body Composition and Growth
Jenkins and Ferrel, 1997
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Jenkins and Ferrel, 1997
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Jenkins and Ferrel, 1997
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(Berg and Butterfield, 1976)
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(Berg and Butterfield, 1976)
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Goats Breeds and Crossbreeds and economical
assessment
(Pineda et al., 1998)
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(Pineda et al., 1998)
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(Pineda et al., 1998)
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Conclusions

• Growth is a critical period in the animal
  production
• Body composition is mainly determined by the
  stage of growth, breed, sex, and age
• Body composition can explain in some extent
  differences in maintenance requirements
  differences between breeds
• Growth and Body Composition studies can help to
  choose the more adequate breed for specific
  conditions
• Nutrient supply can alter body composition of
  neonatal ruminants