G Seeland

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4 Abstract 193 lactating Eastfrisian Milk Sheep were used to investigate 17 udder and teat traits and were subjected to a milkability test. In up to 4 test per ewe during the first five month of lactation a total of 9231 udder measurements and 5204 udder assessments were included in this investigation. Repeated information on somatic cell count per(More)
SUMMARY Milk performance data of cross-breds in the synthetic breed German Black Pied Dairy Cattle (SMR), that had calved for the first time between 1970 and 1984, were used to estimate individual cross-breeding effects on milk production traits. Three million pure-bred and cross-bred cows that were in their first lactation and had originated from(More)
Modem breeding programmes ensure good selection results to the breeder and reduce, at the same time, the genetic variation within and between the breeds of a given animal species. At present efforts are being made to counter that process and, through the establishment of gene pools, to maintain the genetic manifoldness of the useful animal species. These(More)
Changes in genetic variation of sexual maturity, initial and 500-days egg production during 12 year of selection for these traits were estimated by investigating the changes of their h 2 coefficients. Three variants of calculations of h 2 were used utilizing the production records for period of 2, 3 or 4 consecutive generations respectively. The results(More)
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