The effect of subclinical endometritis on reproductive performance in postpartum Bos indicus multiparous beef cows

The effect of subclinical endometritis on reproductive performance in postpartum Bos indicus multiparous beef cows

The objective was to investigate the prevalence of subclinical endometritis (SE) in postpartum Bos indicus multiparous beef cows using different polymorphonuclear cells (PMN) threshold ratios, and to evaluate the impacts of SE on their reproductive performance. A total of 689 postpartum Nellore cows...

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Bibliographic Details
Published in:Animal reproduction science Vol. 237; p. 106928
Main Authors: Oliveira Filho, R.V., Cooke, R.F., de Mello, G.A., Pereira, V.M., Vasconcelos, J.L.M., Pohler, K.G.
Format: Journal Article
Language:English
Published: Netherlands Elsevier B.V 01-02-2022
Subjects:
Animals
Beef cows
Bos indicus
Cattle
Cattle Diseases - epidemiology
Endometrial cytology
Endometritis - veterinary
Estrus Synchronization - methods
Female
Insemination, Artificial - methods
Insemination, Artificial - veterinary
Polymorphonuclear cells
Postpartum Period
Pregnancy
Progesterone
Reproductive performance
Subclinical endometritis
Subclinical endometritis
Bos indicus
Beef cows
Polymorphonuclear cells
Reproductive performance
Endometrial cytology
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Summary:The objective was to investigate the prevalence of subclinical endometritis (SE) in postpartum Bos indicus multiparous beef cows using different polymorphonuclear cells (PMN) threshold ratios, and to evaluate the impacts of SE on their reproductive performance. A total of 689 postpartum Nellore cows (45.2 ± 7.8 days postpartum) were submitted to an estrus synchronization protocol + timed-artificial insemination (TAI). Endometrial cytology samples were collected by cytobrush before the beginning of the protocol. Cows were considered positive for SE if: (PMN) ≥ 3% (PMN3), PMN ≥ 5% (PMN5) and PMN ≥ 7% (PMN7). Pregnancy diagnosis was performed at 30 and 100 d after TAI. The prevalence of cows categorized as positive for SE increased (P < 0.05) as the threshold was lowered (PMN7 = 3.9%; PMN5 = 5.5%; PMN3 = 9.1%). Positive SE cows had similar (P > 0.41) BCS, days postpartum, and expression of estrus at TAI compared with negative SE cows. Positive SE cows had decreased (P = 0.04) pregnancy rates compared to negative SE cows in the PMN5 threshold (26.3 ± 8.7% vs 44.5 ± 4.1%); however, no difference (P > 0.45) was observed between positive and negative SE cows in the PMN3 and PMN7 thresholds. Embryonic mortality between days 30 and 100 was not affected by SE (P > 0.16). In conclusion, the prevalence of SE varies based on the PMN threshold used, whereas SE at the beginning of the TAI protocol decreased the pregnancy rates in postpartum Bos indicus beef cows when the PMN5 was used. •The prevalence of subclinical endometritis varies based on the PMN threshold used in these studies.•Subclinical endometritis does exist in beef cattle herds.•Subclinical endometritis at the beginning of the TAI protocol decreased the pregnancy rates in postpartum Bos indicus beef cows.•Embryonic mortality between days 30 and 100 was not affected by subclinical endometritis.
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ISSN:0378-4320
1873-2232
DOI:10.1016/j.anireprosci.2022.106928