Relationships between milk yield and fertility in dairy cattle.

In three studies of 51,618 Holstein, 6,630 Jersey, and 1,524 Guernsey records, correlation was .07 between 120-day milk yield and number of services required for probable conception, independent of days postpartum. The partial regression coefficient for Holsteins was .014 +/- .001 more services for each additional 100 kg of 120-day milk. For Jerseys and Guernseys, .028 +/- .008 more services were required for each additional 100 kg of 120-day milk.

[1]  W. L. Gaines.  Milk Yield in Relation to Recurrence of Conception , 1927 .

[2]  R. Lewis,et al.  The influence of age, level of production and management on the calving interval. , 1950 .

[3]  D. Olds,et al.  Repeatability, Heritability and the Effect of Level of Milk Production on the Occurrence of First Estrus after Calving in Dairy Cattle , 1953 .

[4]  D. Olds,et al.  Relationship between Level of Milk Production and Breeding Efficiency in Dairy Cattle , 1954 .

[5]  G. M. Carman.  Interrelations of milk production and breeding efficiency in dairy cows , 1955 .

[6]  E. J. Currie.  636. The influence of milk yield on fertility in dairy cattle , 1956, Journal of Dairy Research.

[7]  R. W. Touchberry,et al.  Associations Between Service Interval, Interval from First Service to Conception, Number of Services per Conception, and Level of Butterfat Production , 1959 .

[8]  J. W. Smith,et al.  Relation of Days Open and Days Dry to Lactation Milk and Fat Yields , 1962 .

[9]  R. Everett,et al.  Genetic Relationship Between Production and Breeding Efficiency , 1966 .

[10]  E. B. Burnside,et al.  THE EFFECTS OF DAYS DRY AND DAYS OPEN ON THE MILK AND BUTTERFAT PRODUCTION OF HOLSTEIN-FRIESIAN CATTLE , 1967 .

[11]  J. E. Legates,et al.  Production Losses in Dairy Cattle Due to Days Open , 1968 .

[12]  C. Hewett.  A survey of the incidence of the repeat breeder cow in Sweden with reference to herd size, season, age, and milk yield. , 1968, The British veterinary journal.

[13]  R. Ripley.  Effect of Days Open on Lactation Production , 1970 .

[14]  C. R. Henderson,et al.  Effects of Days Dry and Days Open on Holstein Milk Production , 1972 .

[15]  R. Everett,et al.  Fertility in New York Artificially Inseminated Holstein Herds in Dairy Herd Improvement , 1975 .

[16]  J. Matsoukas,et al.  Effects of Various Factors on Reproductive Efficiency , 1975 .