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Holstein-Friesian cows and White Leghorn chickens.
Just a few decades after its arrival in the United States from Tuscany around 1830, descendents of the White Leghorn emerged as the champion layers.
TSHR locus does not coincide with any of the 13 growth loci detected in our previous QTL study of an intercross between White Leghorn and red jungle fowl
Four layer lines were sampled: eleven males from White Leghorn line
A few research priorities from my perspective: the conversion to perennial agriculture; replacement sources for nitrogen fertilizers; detailed continent-wide soils and climate mapping to determine priority areas for cultivated crops versus grazing areas; productive yet resilient breeds of animals beside the Cornish Cross, White Leghorn, Holstein, Hyper Lean Pig, and Angus and Hereford beef cattle -- with regional emphasis immediately; and a detailed carbon analysis of pasture-raised versus grain fed livestock.
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