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EFFECTS OF UTERINE HORN OF PREGNANCY ON BIRTH WEIGHTS AND GESTATION LENGTHS OF DAIRY CALVES

Summary.: Uterine horn of pregnancy was determined in Guernsey, Holstein and Jersey cows during 1959 to 1966 so that the effects of horn upon birth weights and gestation lengths of calves could be evaluated. Only single, normal, living births were included, 1082 cases in all. Through least squares analyses, the possible confounding of effects of year, season, sire and sex, and most of their first-order interactions were removed along with the effects of the age of the dam. Differences between horns in adjusted means of birth weight and gestation length were slight and not statistically significant. Sire, sex and season effects were detected, but none of the first-order interactions was significant. Age of dam effects were found to be curvilinear.