Association between Subclinical Mastitis with Early Loss of Gestation in a Dairy Cow Herd

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Santiago Xavier Miranda https://orcid.org/0000-0001-5160-8401
Christian Albuja https://orcid.org/0000-0002-8457-206X
Humberto Tríbulo https://orcid.org/0000-0001-7709-7777

Keywords

Cattle, gestation, luteolysis, mastitis, subclinical

Abstract

The objective of this research was to evaluate the relationship between different levels of subclinical mastitis with the early gestation lost during the first 90 post-insemination days in Holstein dairy cattle. The research was made on a dairy farm located in Mejía, Pichincha Province, Ecuador. This research analyzed data from a sample of 619 cows during one year since October 2015 until 2016. The control group (CMT 0), cows not presenting subclinical mastitis until 90 post-insemination days. The CMT T-1 group, cows diagnosed with subclinical mastitis grade 1 up to 90 post-insemination days and the CMT 2-3 group, cows that presented subclinical mastitis grade 2 and 3 up to 90 days post-insemination days. The pregnancy diagnosis was made by transrectal ultrasonography between 28 and 35 post-insemination days and a follow up ultrasound was performed at 60 and 90 days of gestation. A pregnancy loss of 12% was found between 30 to 60 and 5% between 60 to 90 days. With this result was evidenced a relationship between subclinical mastitis grade 2 and 3 with early pregnancy loss (OR 2.6, p <0.01). It is postulated that an infectious process in the udder after the insemination can induce the release of inflammatory mediators such as prostaglandin F2α that would cause lysis of the corpus luteum.
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