Article on heritiabi of feed utilizationlity

Discussion in 'Feeding & Watering Your Flock' started by Speceider, Aug 23, 2011.

  1. Speceider

    Speceider Chillin' With My Peeps

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    Bio Med Central just put out an article on improving feed effecciency. This is the abstract. Full article is BMC Genetics, 20111, 12:71.

    Abstract (provisional)

    Background
    Poultry production has been widely criticized for its negative environmental impact related to the quantity of manure produced and to its nitrogen and phosphorus content. In this study, we investigated which traits related to excretion could be used to select chickens for lower environmental pollution. The genetic parameters of several excretion traits were estimated on 630 chickens originating from 2 chicken lines divergently selected on apparent metabolisable energy corrected for zero nitrogen (AMEn) at constant body weight. The quantity of excreta relative to feed consumption (CDUDM), the nitrogen and phosphorus excreted, the nitrogen to phosphorus ratio and the water content of excreta were measured, and the consequences of such selection on performance and gastro-intestinal tract (GIT) characteristics estimated. The genetic correlations between excretion, GIT and performance traits were established.

    Results
    Heritability estimates were high for CDUDM and the nitrogen excretion rate (0.30 and 0.29, respectively). The other excretion measurements showed low to moderate heritability estimates, ranging from 0.10 for excreta water content to 0.22 for the phosphorus excretion rate. Except for the excreta water content, the CDUDM was highly correlated with the excretion traits, ranging from -0.64 to -1.00. The genetic correlations between AMEn or CDUDM and the GIT characteristics were very similar and showed that a decrease in chicken excretion involves an increase in weight of the upper part of the GIT, and a decrease in the weight of the small intestine.

    Conclusion
    In order to limit the environmental impact of chicken production, AMEn and CDUDM seem to be more suitable criteria to include in selection schemes than feed efficiency traits.
     
  2. galanie

    galanie Treat Dispenser No More

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    Typical. Instead of dealing with the mess, they want to change the chicken.
     
  3. kizanne

    kizanne Chillin' With My Peeps

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    To impact the environment less, compost it and use it instead of commercial fertilizers.
     
  4. PAJerry

    PAJerry Chillin' With My Peeps

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    Based on the tremendous productivity of my garden this year, the more poop the better!! I've never had such beautiful asparagus, spinach, sweet corn, etc. as I now have after using chicken manure for a few years. The poop can be almost as important as the eggs in my opinion.
     

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