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Effect of abnormal vaginal discharge at oestrus on conception rate after artificial insemination in cows

Published online by Cambridge University Press:  18 August 2016

A. R. Mahmoudzadeh ,
M. Tarahomi  and
H. Fotoohi
A. R. Mahmoudzadeh
Affiliation:
Department of Animal Science, Faculty of Agricultural Science, Gilan University, PO Box 3179, Rasht, Iran
M. Tarahomi
Affiliation:
Sefidroud Agroindustrial Company, PO Box 1651, Rasht, Iran
H. Fotoohi
Affiliation:
Department of Plant Breeding, Faculty of Agricultural Science, Gilan University, PO Box 3179, Rasht, Iran
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Abstract

During a 2-year study from January 1997 to December 1999, the visual characteristics of the cervical mucous discharge of cows and heifers in oestrus and their relations to conception rate were studied in a large dairy herd of Holstein-Friesian cows. Cows were divided into two groups based on mucous discharge being of normal or abnormal appearance and the group with abnormal discharge was further divided into the following classes: cervical mucus with urine (CMU), cervical mucus with microbes (CMM), cervical mucus with blood (CMB) and a group with no cervical mucus (NCM). From 6169 cases of cows in oestrus, 82·2% had normal discharge, and the remaining 17·8% had abnormal discharge classifications (6·1% CMU, 5·1% CMM, 0·5% CMB and 6·1% NCM). Conception rate after artificial insemination (AI) in the normal group (38·3%) was significantly higher than that of the abnormal group (27·9%), (P < 0·05). When the conception rate of the normal group was compared with each one of the abnormal classifications, it was significantly different from that of CMU (26·5%), CMM (22·6%) and CMB (21·8%), (P < 0·05), but not from that of NCM (34·4%), (P > 0·05). From 1734 cases of heifers in oestrus, only 6% had abnormal discharges, and the conception rates of the normal and abnormal groups were not significantly different (P > 0·05).

We conclude that AI of cows in oestrus discharging cervical mucus that is contaminated with urine, microbes or blood produces conception rates significantly lower than those of cows discharging a normal and clear mucus. Absence of a cervical mucous discharge at the time of AI of cows does not imply a low conception rate. In the case of heifers, appearance of cervical mucus had no effect on the conception rate after AI.

Keywords

conception ratedairy cowsvaginal mucosa
Type
Reproduction
Information
Animal Science , Volume 72 , Issue 3 , June 2001 , pp. 535 - 538
Copyright
Copyright © British Society of Animal Science 2001

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