Correlated changes in reproductive components accompanying 10 generations of selection for improved sow productivity index
Article Abstract:
Two populations of Landrace swine were segregated according to swine productivity index to determine correlative changes in reproductive components of the sows, and the effects of fetal position, sex and orientation within the uterus on progeny. Select-line sows were found to have greater uterine capacity, superior mothering ability and milk production, resulting in heavier litters. Female fetuses located between male fetuses weighed less than other female fetuses, indicating overcrowding. Male fetuses did not show weight variation. Orientation did not affect fetal weight.
Publication Name: Journal of Animal Science
Subject: Zoology and wildlife conservation
ISSN: 0021-8812
Year: 1992
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Classical and mixed-model analysis of an index selection experiment for fecundity in Drosophila melanogaster
Article Abstract:
An experimental study was conducted to obtain an understanding of the benefits of using multi-model approach to study the increase in number of pupas in Drosophila melanogaster. The three indices of family information based on dam's information (Id), information on dam's half-sibs and full-sibs (Ihd) and information on full-sibs and half-sibs of the sire (Ihs), were assessed for selection of traits linked to fitness. Id was found to be the most reliable index for predicting the increase in number of pupas.
Publication Name: Journal of Animal Science
Subject: Zoology and wildlife conservation
ISSN: 0021-8812
Year: 1992
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Selection for immune response in goats: the effect of immunization procedure on antibody response to diphtheria toxoid and human serum albumin
Article Abstract:
The immune response of kids injected with human serum albumin (HSA) and diphtheria toxoid (DIF) was not affected by the site of injection. Those that received one antigen alone had a stronger response than those immunized for both DIF and HSA at the same time. Sire and weight did not affect the antibody response. Age seemed to have an effect as younger animals had a weaker immune response. The degree of response to a particular antigen was thought to be genetically determined.
Publication Name: Journal of Animal Science
Subject: Zoology and wildlife conservation
ISSN: 0021-8812
Year: 1992
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