Identification and characterization of molecular genetic differences among Bos indicus x Bos taurus: feedlot cattle

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Title: Identification and characterization of molecular genetic differences among Bos indicus x Bos taurus: feedlot cattle
Author: Yim, Young-Sun
Abstract: The objective of this study was to identify genotypic differences in different breeds of cattle and to determine their associations with growth , performance and carcass traits . The majority of cattle used in this study were Bos indicus influenced . All the cattle were identified for feedlot and carcass data such as initial weight (IWT ) , final weight (FWT ) , number of days on feed (DOF ) , average daily gain (ADG ) , skeletal mamrity (SM ) , overall maturity (OM ) , lean maturity (LM ) , hot carcass weight (HCW ) , calpastatin gene activity (CAL ) , rib -eye area REA ) , kidney , pelvic and heart fat percentage (KPH ) , marbling score (MRB ) , and Wamer -Bratzler shear force . Blood samples were obtained from all animals to extract genomic DNA . Five candidate genes were investigated for polymorphisms related to performance traits . These genes were Growth Hormone , Insulin -like Growth Factor 1 , Somatostatin , Leptin and Prolactin . Associations between genotypes and performance measured were analyzed through analyses of variance procedures . Genotypic and allelic frequencies were calculated for the prolactin microsatellite marker in animals in the upper 10 % and lower 10 % of the distribution for all traits studied . Genotypes were not able to be determined for Growth Hormone , Insulin -like Growth Factor 1 , Leptin , and Somatostatin .
URI: http : / /hdl .handle .net /2346 /16907
Date: 1998-12

Citation

Identification and characterization of molecular genetic differences among Bos indicus x Bos taurus: feedlot cattle. Doctoral dissertation, Texas Tech University. Available electronically from http : / /hdl .handle .net /2346 /16907 .

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