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Fertility parameters of dairy cows with cystic ovarian disease after treatment with gonadotrophin‐releasing hormone
Author(s) -
Hooijer G. A.,
Oijen M. A. A. J.,
Frankena K.,
Valks M. M. H.
Publication year - 2001
Publication title -
veterinary record
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.261
H-Index - 99
eISSN - 2042-7670
pISSN - 0042-4900
DOI - 10.1136/vr.149.13.383
Subject(s) - insemination , fertility , dairy cattle , herd , artificial insemination , zoology , medicine , gynecology , biology , pregnancy , andrology , sperm , population , genetics , environmental health
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 μg 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.