Genetic parameters of linear type traits for beef cattle and their correlation with production of Simmental cows

Data provided by ABS Global were used to estimate genetic parameters of linear type traits for Simmental females.Scores were collected by 36 evaluators from 1988 to 2000.Body traits evaluated were stature, body length, muscle, capacity, femininity, rear leg set, and feet and pasterns.Udder traits evaluated were udder attachment, udder depth and, teat size.Body condition score was also included.Scores were assigned based on a 50 point linear scale.Body condition was assigned based on a 9 point scale.The number of animals evaluated for body traits ranged from 14,317 to 14,322.The number of animals evaluated for udder traits ranged from 8,046 to 8,052.The number of animals evaluated for body condition score was 9,230.All traits were analyzed using an animal model and MTDFREML procedures to estimate genetic parameters.The statistical model for all traits included the additive direct genetic (animal) effect and the fixed effects of age of cow and contemporary group.Heritability estimates ranged from 0.12 to 0.60.Genetic and phenotypic correlations differed in magnitude and sign among traits.In general, parameter estimates were within the range of those previously reported in the literature.Results from the study established.that with selection it is possible to change type traits in Simmental cattle.Measures of production in Sinunental cattle were regressed on linear type traits.Measures of production considered in the study were: number of calves, calving interval, calf adjusted birth weight, calf average adjusted weaning weight, and total calf adjusted weaning weight.Results from this study established that there were significant (P < .05)relationships among the traits and many measures of production.The relationships differed in magnitude and sign among the traits and measures of production.viii