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Hematocrit values and mortality from ascites in cold-stressed broilers from parents selected by hematocrit
A Shlosberg1, M Bellaiche, G Zeitlin
1Kimron Veterinary Institute, Bet Dagan, Israel.
Poultry Science
|January 1, 1996
Summary
Broiler hematocrit is inherited and linked to ascites syndrome. High hematocrit broilers showed increased susceptibility to cold-induced ascites, suggesting selective breeding can mitigate losses.
Area of Science:
- Animal Science
- Avian Genetics
- Poultry Health
Background:
- Ascites syndrome is a significant concern in cold-stressed broilers.
- Hematocrit levels in broilers may be heritable and indicate ascites resistance.
Purpose of the Study:
- To validate the hypothesis that relative hematocrit is inherited and can predict ascites resistance in broilers.
- To investigate the impact of parental hematocrit on progeny susceptibility to cold-induced ascites.
Main Methods:
- Determined hematocrit in grandparent broiler stocks.
- Performed controlled matings (LL, LM, MH, HH) based on hematocrit.
- Exposed progeny to a cold environment predisposing to ascites.
Main Results:
- Progeny from high hematocrit (HH) parents exhibited significantly higher hematocrit values (P < 0.0001).
- HH progeny experienced greater mortality from ascites under cold stress (P < 0.0001).
- Low-high (LH) progeny showed increased mortality from non-ascites causes (P < 0.0001).
Conclusions:
- Broiler hematocrit is heritable and influences ascites susceptibility.
- Eliminating high hematocrit birds in breeding programs is recommended for managing cold-induced ascites.
- Selective breeding based on hematocrit can improve broiler resilience to environmental stressors.