Repeatability, Heritability and the Effect of Level of Milk Production on the Occurrence of First Estrus after Calving in Dairy Cattle

Olds, Durward; Seath, D.M.

doi:10.2527/jas1953.12110x

Cited by 30 publications

(15 citation statements)

References 0 publications

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“…In a selection program effort could well be expended on other more highly heritable traits. These estimates in general agree with those found in the literature (Carman, 1955;Legates, 1954;Olds and Seath, 1950;Olds and Seath, 1953;Dunbar and Henderson, 1953;and Pou~ al., 1953).…”

supporting

confidence: 83%

“…Casida and Venske (1936) and Olds and Seath (1953) reported intervals of 32.l days and 40.7 days, respectively. Oloufa (1955) found a difference between cattle and buffaloes in Egypt .…”

Section: Calving To First Heatmentioning

confidence: 99%

“…Heritability of calving interval was zero. Olds and Seath (1953) estimated the repeatability of the interval from calving to first heat as 0.29. The heritability estimate based on the intra-sire regression of daughter on dam for the first record was 0.27.…”

Section: Other Factors Influencing Reproductive Performancementioning

confidence: 99%

See 2 more Smart Citations

A Study of the Reproductive Performance of a Purebred Hereford Herd1

Lindley

Easley

Whatley

et al. 1958

Journal of Animal Science

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supporting

confidence: 83%

“…Casida and Venske (1936) and Olds and Seath (1953) reported intervals of 32.l days and 40.7 days, respectively. Oloufa (1955) found a difference between cattle and buffaloes in Egypt .…”

Section: Calving To First Heatmentioning

confidence: 99%

See 1 more Smart Citation

A Study of the Reproductive Performance of a Purebred Hereford Herd1

Lindley

Easley

Whatley

et al. 1958

Journal of Animal Science

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“…Olds and Seath (1953) analyzed breeding and milk records from the dairy herd of the Kentucky Agricultural Experiment Station. The average length of time from calving to first estrous for 210 cows who had normal parturitions was 32.1 days.…”

Section: Postpartum Intervalmentioning

confidence: 99%

A study of calving interval

Flores

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“…In field data (2,4,6,14,17,18,20) the relationship between milk yield and reproductive performance was little or nil. No biological relationship between services per conception and milk fat production was found by Touchberry et al (26).…”

Section: Introductionmentioning

confidence: 99%

Reproductive Performance from Daughters of Single and Multiple Trait Selected Sires

Rothschild

Miller

Pearson

1981

Journal of Dairy Science

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Sires selected for milk in first lactation (Yield) and those selected for udder conformation, percentage of daughters culled in first lactation, and fat-corrected milk (Merit) were mated randomly to cows in the Beltsville herd. Subsequent offspring were mated to bulls from the same selection group as their sires. Reproductive traits were numbers of heats and services, age at first heat, gestation length, and age at first calving for heifers and numbers of heats and services, gestation length, days to first heat postpartum, and calving interval for cows. Selection groups differed only for gestation length with Merit females having a 2 day longer gestation than Yield females. Yield females calved earlier (12 days) and had shorter calving intervals (14 days) than Merit females.Mating bull was significant for gestation length and for percent pregnant on a given service but not on first or first four services. Selection groups differed in gestation length only. Variance components for mating bulls for all traits and for sire of cow for gestation length were all less than 10% with most less than 3%.Reproductive performance of offspring from selection of bulls solely for milk in first lactation was not inferior to that of offspring of bulls selected less intensely for milk. RightsWorks produced by employees of the U.S. Government as part of their official duties are not copyrighted within the U.S. The content of this document is not copyrighted. ABSTRACTSires selected for milk in first lactation (Yield) and those selected for udder conformation, percentage of daughters culled in first lactation, and fat-corrected milk (Merit) were mated randomly to cows in the Beltsville herd. Subsequent offspring were mated to bulls from the same selection group as their sires. Reproductive traits were numbers of heats and services, age at first heat, gestation length, and age at first calving for heifers and numbers of heats and services, gestation length, days to first heat postpartum, and calving interval for cows. Selection groups differed only for gestation length with Merit females having a 2 day longer gestation than Yield females. Yield females calved earlier (12 days) and had shorter calving intervals (14 days) than Merit females.Mating bull was significant for gestation length and for percent pregnant on a given service but not on first or first four services. Selection groups differed in gestation length only. Variance components for mating bulls for all traits and for sire of cow for gestation length were all less than 10% with most less than 3%.Reproductive performance of offspring from selection of bulls solely for milk in first lactation was not inferior to that of

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Repeatability, Heritability and the Effect of Level of Milk Production on the Occurrence of First Estrus after Calving in Dairy Cattle

Cited by 30 publications

References 0 publications

A Study of the Reproductive Performance of a Purebred Hereford Herd1

A Study of the Reproductive Performance of a Purebred Hereford Herd1

A study of calving interval

Reproductive Performance from Daughters of Single and Multiple Trait Selected Sires

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