Studies on the accident rate in single and multiple births in dairy cows

概要

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We investigated the incidence of multiple births and its change in the MK area within T Branch, Hokkaido, and the accident rate at the time of birth and the production indices in single and multiple births among primiparous and multiparous cows in T Branch to clarify the accident rate at the time of birth in dairy cattle. 1) The incidence of multiple births significantly increased from 2.76% in 1972 to 4.18% in 2004-2007. 2) The incidence of multiple births in multiparous cows was significantly higher than in primiparous cows(5.18 % vs. 1.13 %). 3) The accident rate in multiple births was significantly higher than in single births(37.48% vs. 6.53%). 4) The accident rates in single births and multiple births among primiparous cows were significantly higher than among multiparous cows(9.34% & 45.25 % vs. 5.38 % & 36.82 %). 5) The production rate(number of newborn calves per parturition) and the ratio of calves born(number of newborn calves/number of fetuses) in multiple births among primiparous cows were significantly different from those in single births among primiparous cows(1.33 & 0.66 vs. 0.91 & 0.91). Similarly, the production rate and the ratio of calves born in multiple births among multiparous cows were significantly different from those in single births among multiparous cows(1.48 & 0.74 vs. 0.95 & 0.95).
Japanese Society of Large Animal Clinics / Large Animal Clinic Research Associationの論文