Shared Flashcard Set

Details

Poultry Breeding Chapter 18
Poultry Breeding Chapter 18
14
Agriculture
Undergraduate 3
04/09/2018

Additional Agriculture Flashcards

 


 

Cards

Term
Selection for high egg producing birds coupled with housing layers in cages have led to increases in...
Definition
-aggressive behavior
-cage fatigue
-skeletal problems
-cannibalism
Term
Objectives of a layer breeding program
Definition
-To minimize mortality, by improving genetic resistance to disease and stress factors (high adaptability to different environments)
-To maximize the sale value of egg output, i.e. more eggs of preferred quality
-To minimize feed cost, or maximize egg income of feed cost
-To improve egg quality (external and internal), in line with specific market requirements
Term
The decision to breed white or brown eggs should be based on...
Definition
1.How many eggs, white or brown a producer can sell at which price (or price differential)
2.The production cost of brown eggs versus white eggs
Term
Some differences between white and brown eggs
Definition
-Persistency of lay: Better in white egg layers than brown egg layers
-Percentage of cracked and broken eggs: Higher in white eggs than brown eggs
-Percentage of blood spots: About equal
-Percentage of meat spots: Higher in brown eggs than white eggs
Term
Primary Traits of layers
Definition
1. Value of saleable day old chicks per breeder hen
2 Value of saleable market eggs per hen
3. Carcass value of spent hen
4. Cost of feed consumed per hen
Term
Main trait groups in layers
Definition
-Egg production
-Product quality
+outer
+inner
-Production efficiency
-Reproductive performance
-Functional traits
Term
Egg production traits in layers
Definition
-Age at first egg
-Hen day egg production
-Persistency of lay
-Molt (Pause)
Term
Product quality traits in layers
Definition
Egg weight/size
Term
outer egg quality traits in layers
Definition
Egg shell quality including
1 Cracks and hair-cracks
2 Pinholes
3 Shell thickness
4 Shell color
5 Shell porosity
6 Egg shape
Term
inner egg quality traits in layers
Definition
-Albumen quality
-Blood and meat spots
-Haugh units
-Yolk color
-Taste and smell
Term
Production efficiency traits in layers
Definition
-Housing and mature body weights
-Feed efficiency
Term
Reproductive performance traits in layers
Definition
-Female and male fertility
-Hatchability
-Livability
Term
Functional traits in layers
Definition
-Disease resistance
-Livability
-Cannibalism
-Temperament (e.g. flightiness)
-Leg strength
-Stress resistance
-Broodiness
Term
A schematic three-way cross to produce the commercial layer
Definition
[image]
Supporting users have an ad free experience!