Hooijer G A, van Oijen M A, Frankena K, Valks M M
Veterinary Practice Mid-Fryslân, Akkrum, The Netherlands.
Vet Rec. 2001 Sep 29;149(13):383-6. doi: 10.1136/vr.149.13.383.
Fertility data were collected every four weeks for 10 years from 40 herds of Holstein-Friesian dairy cattle. The data collected during 925 lactations from cows with cystic ovarian disease which were treated with 500 microg gonadorelin were compared with data from a control group of 13,869 normal lactations. The intervals between parturition and first insemination and between parturition and conception were significantly shorter (P<0.001) in the normal cows, but the interval between first insemination and conception was not. The overall conception rate tended to be higher (P<0.10) in the normal cows, but the conception rate after the first insemination was significantly higher (P<0.001) and the number of services per conception was significantly lower (P=0.008) in the normal cows.
在10年时间里，每隔四周从40个荷斯坦-弗里生奶牛群收集繁殖数据。将用500微克促性腺激素释放激素治疗的925例患有卵巢囊肿疾病奶牛的泌乳期收集的数据，与13869例正常泌乳期的对照组数据进行比较。正常奶牛分娩至首次输精的间隔以及分娩至受孕的间隔显著更短（P<0.001），但首次输精至受孕的间隔并非如此。正常奶牛的总体受孕率倾向于更高（P<0.10），但正常奶牛首次输精后的受孕率显著更高（P<0.001），每次受孕的输精次数显著更低（P=0.008）。
