Genetic parameters from factorial cross breeding in two duck strains (anas platyrhynchos) Brown Tsaiya and Pekin, for growth and fatty liver traits.

1. A total of 655 mule ducklings were produced in three hatches by artificial insemination of common duck females Brown Tsaiya and Pekin "Alienor" and of their 2 reciprocal crossbreds with Muscovy semen. 2.

Plasma lipoproteins and liver lipids in two breeds of geese with different susceptibility to hepatic steatosis: changes induced by development and force-feeding.

Susceptibility to fatty liver in the force-fed goose is partly under genetic control. However, the mechanisms leading to liver steatosis in this avian model are poorly understood, but may involve perturbation in hepatic lipoprotein synthesis. Plasma lipoproteins were fractionated by density gradient ultracentrifugation from plasma of geese differing in their susceptibility to liver steatosis (Landes breed, highly susceptible; Rhine breed, partly resistant).

Isolation of Mycoplasma gallisepticum from geese.

Two breeding flocks of 2-year-old geese in the Landes region of Southwest France were cultured for mycoplasmas. In one flock of 134 birds Mycoplasma gallisepticum was isolated from three individuals, from a different site in each bird (i.e.