Interrelationships Between Production and Reproductive Diseases in Holstein Cows. Age and Seasonal Patterns
Open Access
- 1 November 1980
- journal article
- research article
- Published by American Dairy Science Association in Journal of Dairy Science
- Vol. 63 (11), 1918-1924
- https://doi.org/10.3168/jds.s0022-0302(80)83159-6
Abstract
Influences of age and season on occurrence of dystocia, retained placenta, metritis, cystic follicle and luteal cyst were studied retrospectively. The 6 yr of data were from 2960 lactation records of 1401 registered Holstein cows from 20 commercial herds that participated in the dairy herd health program of the Ontario [Canada] Veterinary College. For each disease, odds ratio analyses compared the risk of disease in each age group to the risk in all other age groups pooled. The following age groups were at increased risks of diseases: dystocia, 2 to less than 4 yr; retained placenta and metritis, 7 to less than 10 yr and 10 or more yr; cystic follicle and luteal cysts, 10 yr or more. For all diseases except dystocia, age 2 to less than 4 yr was at decreased risk. Formal statistical methods were used to test for unimodal seasonal patterns in monthly calvings, in monthly disease incidence (number of diagnoses), and in risk (lactational incidence rate) of disease according to month of calving. There were the following significant peaks: fall calvings in the age group 2 to less than 4 yr, summer-fall risk of metritis, fall-winter incidence of dystocia and metritis, and fall-winter risk of dystocia.This publication has 13 references indexed in Scilit:
- Interrelationships Between Production and Reproductive Diseases in Holstein Cows. DataJournal of Dairy Science, 1980
- Relationship of Reproductive Factors with Interval and Rate of ConceptionJournal of Dairy Science, 1979
- Parameter Estimation and Sire Evaluation for Dystocia and Calf Size in HolsteinsJournal of Dairy Science, 1976
- A test for seasonality of events with a variable population at risk.Journal of Epidemiology and Community Health, 1975
- A CLINICAL STUDY OF DYSTOCIA IN CATTLEAustralian Veterinary Journal, 1974
- Factors Associated with the Incidence of Retained PlacentasJournal of Dairy Science, 1974
- Fertility and Reproductive Disorders in Swedish CattleBritish Veterinary Journal, 1964
- The recognition and estimation of cyclic trendsAnnals of Human Genetics, 1961
- Genetical and Statistical Investigations into So-Called Cystic Ovaries in CattleActa Agriculturae Scandinavica, 1957
- A Study of Atretic Large Follicles in Six Sire-Groups of Holstein-Friesian CowsJournal of Dairy Science, 1953