Long‐term goose breeding for egg production and crammed liver weight

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Abstract
1. Results of an 8‐year (1981 to 1988) period of breeding geese for egg production and crammed liver weight, including pheno‐typic and/or genetic parameters for various traits (1982 to 1985), as well as line tests (1987 to 1988), are summarised for two lines. 2. The regressed annual genetic gains over years were 2.7 eggs and 30.8 g crammed liver. However, there was a decline in the rate of genetic progress after 4 years of selection. 3. Heritability estimates were found to be relatively high for most traits, whereas phenotypic and genetic correlation coefficients between traits were rather low, as would be expected from lines not previously subjected to an intense selection programme. 4. Phenotypic correlation coefficients between part‐period records and full‐period egg production, suggest that 3‐month (October to December) records may be adequate to identify most of the best first‐year layers. However, sexual maturity should be treated as a separate trait. 5. The cross between the ‘Grey’ (male) line, superior in crammed liver weight, and the ‘White’ (female) line, excelling in egg production, seems to be superior to the pure lines, in a fully‐integrated enterprise.

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