Weighting Components of Type in Classifying Holstein

Estimation of genetic population parameters for a mating appraisal program

“…e Estimate of Aitchison (1971). In general, these results agree with the work of Rennie et al (1974), but are smaller than those reported by Atkeson et al (1969), Cassell et al (1973 and Johnson and Fourt (1960). Results reported by Atkeson et al (1969) ranged from .21 to .56, those of Cassell et al (1973) ranged from .05 to .54 with most between .10 to .30 and those of Johnson and Fourt (1960) ranged from .17 to .80 (see Table 4 for complete results).…”

Type Appraisal: III. Relationships of First Lactation Production and Type Traits with Lifetime Performance

“…There is, however, substantial information about a cow's production available through type appraisal. The two type traits which have been effective in predicting producing ability have been udder depth and dairy character rating (1,2,8,14,17). The results of the regression analyses indicate the udder traits were a slightly better indicator of production than were the management or body traits.…”

“…The correlations of sharpness-17 with milk and fat yield in this study were .15 and .14. Correlations of .20 to .55 have been reported (1,8,14) using type classification ,JOURNAL OF DAIRY SCIENCE VOL. 55, No.…”

Dystocia in dairy cattle. Age of dam, maternal considerations, and relationships with economic traits

“…Selection of bulls on type alone (PDT) or type and production (TPI) would result in increased dystocia. Increased size is a factor in both increased dystocia (Pollak and Freeman, 1976) and improved confir mation (Atkeson et al, 1969). Thus, size is probably a factor in the relationship of type with dystocia.…”