Abstract
The study was carried out to investigate the magnitude of non-genetic factors influencing linear type traits and to estimate phenotypic correlations among these traits in Simmental cows. The 16 linear type traits were recorded for 148 Simmental cows reared in a private farm in Eastern Turkey. A statistical model used in this research included fixed effects of stage of lactation, parity, season at time of classification and classifier. The age at time of classification was included to the statistical model as co-variable. Parity, stage of lactation, season at time of classification and classifier effect was significant (P<0.01-0.05) for chest width, angularity, teat placement side view, body depth. Parity, stage of lactation, season at time of classification effect was significant (P<0.01-0.05) for rear leg rear view, rump width, suspensory ligament and udder depth. Linear and quadratic effects of age at time of classification were also significant (P<0.01-0.05) for rump width, rump angle, teat placement rear view, foot angle, suspensory ligament and udder depth. Phenotypic correlations among linear type traits were in low to medium range.
Highlights
The study was carried out to investigate the magnitude of nongenetic factors influencing linear type traits and to estimate phenotypic correlations among these traits in Simmental cows
Since the linear type traits can be determined in early life of cattle and could have moderate genetic correlations with milk yield and longevity traits, they might be used as indirect predictors of these production traits (Bohlouli et al 2015)
The linear type trait scoring and determination of the effects of non-genetic factors on these traits of Simmental cows reared on the mountainous region of Eastern Turkey has not been made in the past
Summary
The study was carried out to investigate the magnitude of nongenetic factors influencing linear type traits and to estimate phenotypic correlations among these traits in Simmental cows. Classifier, season at time of classification, stage of lactation and age of the cow at time of classification are considered as the most significant environmental factors, several non-genetic factors affecting linear type traits were pointed out by Esteves et al (2004), Mazza et al (2013), Dubey et al (2014). These factors have to be adjusted in the model, or by pre-adjustment of these records for breeding value estimation of linear type traits (Veerkamp et al 2002). The current study was conducted in order to investigate the quantification of non-genetic factors influencing linear type traits of Simmental cows
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