Phenotypic, Genetic, and Environmental Relationships of Milk Production and Type Ratings of Holstein Cows

Wilcox, C.J.; Pfau, K.O.; Mather, R.E.; Gabriel, Ray; Bartlett, John

doi:10.3168/jds.s0022-0302(62)89370-9

Cited by 17 publications

(9 citation statements)

References 20 publications

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“…Even though several investigators (1, 3, 6, ~ ' 13, 16, 20, 28) reported different heritabilities • ~ for mammary traits, they found nearly equal -heritabilities for the three traits, as in this study. The heritability for body capacity was .36, which agrees with the average of many 2 other estimates for Holstein records (6,8,13,14,30 Heritabilities were not adjusted for discontinuity since the appropriate variance ratios to use for genetic evaluation are those associated with the discontinuous variables. Predictions of genetic progress would require adjustment as well as the assumption of an underlying normal distribution which seems unlikely for some of the descriptive traits.…”

Section: ~0~0supporting

confidence: 64%

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Genetic and Herd-Year Variation in Type Traits of Brown Swiss Cows

Mínguez

Wiggans

Vleck

1979

Journal of Dairy Science

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Type classification records of 15,697 Brown Swiss cows by 1955 sires in 852 herds were analyzed with a crossclassified (herd-year and sire of cow) model. Fractions of variance due to herd-year effects ranged from 8% for mammary system to 17% for body capacity. Within herd-year heritabilities ranged from 24% for feet and legs to 43% for final score. Descriptive traits were analyzed by the same model except that each category was treated as a binomial variable. Proportions of variance due to herd-year effects for the descriptive traits were generally below 10%. Heritabilities were generally below 15%.

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Section: ~0~0supporting

confidence: 64%

“…Estimates of heritability of type traits (1,3,4,5,6,7,8,9,11,12,13,14,16,18,19,20,21,22,23,24,28,30) mostly are for HolsteinFriesian cattle. Much of this research was reviewed by White (27).…”

Section: Introductionmentioning

confidence: 99%

Genetic and Herd-Year Variation in Type Traits of Brown Swiss Cows

Mínguez

Wiggans

Vleck

1979

Journal of Dairy Science

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“…The genetic correlations between the type traits and first lactation and lifetime variables are in Table 4. The genetic correlation between milk and fat yield was .76 which agrees with .71 to .87 by other investigators (8,9,14,21,26). The genetic correlation between milk and fat percent was --.37 and between fat and fat percent was .28.…”

Section: Resultssupporting

confidence: 78%

“…Genetic correlations between measures of production and final type score have been estimated by several workers (10,11,14,19,21,26). These estimates have been variable but average about .…”

Section: Introductionmentioning

confidence: 99%

“…aPresent Address: Animal Improvement Programs Laboratory, Agricultural Research Service, USDA, Beltsville, Maryland, 20705. 4,8,11,12,14,19,21,22,26) have shown low phenotypic correlations (average, .15) between final score and milk or milk fat yield. A few of these studies calculated phenotypic correlations between production and type categories: general appearance .00 to .17; dairy character .18 to .55; body capacity .08 to .17; mammary system .03 to .28; feet and legs .01 to .09; and rump .00 to .07.…”

Section: Introductionmentioning

confidence: 99%

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

Norman¹,

Vleck²

1972

Journal of Dairy Science

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Phenotypic and genetic correlations were estimated between 48 type appraisal traits and first lactation milk production to determine the importance of appraisal traits in a breeding program from 5,024 records from the New York type appraisal program. Most phenotypic correlations amgng the type traits were near zero. Depth of udder was the appraisal trait having the highest correlation with first lactation milk (.27) and fat (.23). Multiple correlations of all appraisal traits with first lactation milk and fat were .44 and .40.Correlations with lifetime variables were calculated from 2,068 records meeting time qualifications. Of the first lactation variables, milk yield had the highest correlation with lifetime milk (.34), and fat yield had the highest correlation with number of lactations (.21). All appraisal traits combined were as effective as production variables in predicting number of lactations.Genetic correlations suggested that bulls that sire daughters with high production tend to sire daughters with weaker udder attachments. High genetic correlations between first lactation production and lifetime performance support the utility of selection on first lactation production.

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Estimates of repeatability and heritability of productive and reproductive traits in a herd of Jersey cattle

2000

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Estimates of the repeatability and heritability of 19 measures of performance in Jersey cows were obtained using an animal model with a relationship matrix and a derivative-free restricted maximum likelihood algorithm. The data consisted of 935 records for 374 cows by 69 sires over the period [1969][1970][1971][1972][1973][1974][1975][1976][1977][1978][1979][1980][1981][1982][1983][1984][1985][1986][1987]. The estimates were similar to those obtained by ordinary least squares methods reported for the same data set and in other studies, but had smaller error variances. A likelihood ratio test showed agreement between these heritability estimates and those in the literature. The heritability estimates of milk, fat, protein, lactose-mineral, solids-not-fat, and total solids yields were about 0.25; for the corresponding percentages, and for the protein to fat and solids-not-fat to fat ratios, the estimates were 0.50. Heritability estimates were 0.10 or less for the time from parturition to first breeding and for three measures of somatic cell counts. These estimates of heritability in a dairy cattle population in a subtropical environment were not different from those of populations in temperate climates.

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Phenotypic, Genetic, and Environmental Relationships of Milk Production and Type Ratings of Holstein Cows

Cited by 17 publications

References 20 publications

Genetic and Herd-Year Variation in Type Traits of Brown Swiss Cows

Genetic and Herd-Year Variation in Type Traits of Brown Swiss Cows

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

Estimates of repeatability and heritability of productive and reproductive traits in a herd of Jersey cattle

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