Pregnancy Loss (28-110 Days of Pregnancy) in Holstein Cows: A Retrospective Study

The objective of this retrospective study was to investigate the prevalence of pregnancy loss (PL; between 28-110 pregnancy days) and its relationship with factors: farm, year (2015-2018), season, artificial insemination (AI)-rank, parity, AI-type (fixed-time vs. oestrus-AI), previous PL, days in mi...

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Published inAnimals (Basel) Vol. 10; no. 6; p. 925
Main Authors Fernandez-Novo, Aitor, Fargas, Octavi, Loste, Juan Manuel, Sebastian, Francisco, Perez-Villalobos, Natividad, Pesantez-Pacheco, Jose Luis, Patron-Collantes, Raquel, Astiz, Susana
Format Journal Article
LanguageEnglish
Published Switzerland MDPI AG 01.06.2020
MDPI
Subjects
Animal lactation
Animal reproduction
Artificial insemination
Cattle
Dairy cattle
Health aspects
Holstein Friesian cattle
Milk
Parity
Pregnancy
rank of AI
Reproduction (biology)
reproductive strategy
season
Semen
Sprinkler systems
Studies
type of AI
Spain
rank of AI
season
reproductive strategy
type of AI
parity
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Summary:The objective of this retrospective study was to investigate the prevalence of pregnancy loss (PL; between 28-110 pregnancy days) and its relationship with factors: farm, year (2015-2018), season, artificial insemination (AI)-rank, parity, AI-type (fixed-time vs. oestrus-AI), previous PL, days in milk (DIM), fixed-time-AI protocol, AI-technician, bull, and semen-type (sexed vs. conventional). Data of 19,437 Holstein cattle AIs from eight Spanish farms were studied. Overall conception rate was 34.3% (6696/19,437) and PL 12.3% (822/6696). The PL was more likely to occur in primiparous (10.8%, odds ratio (OR) = 1.35; = 0.04) and multiparous (15.3%; OR = 2.02, < 0.01) than in heifers (PL = 6.9%, reference). Pregnancies achieved with AI after observed oestrus and natural breedings were associated with less PL than pregnancies after fixed-time-AI (12.7 vs. 11.9%; OR = 0.12, = 0.01). First AIs related to higher PL than ≥2nd AIs (PL = 13.8% vs. 11.2; OR = 0.73, < 0.01). The factors season, fixed-time-AI protocol, DIM, bull, AI-technician, or type of semen were not significantly associated with PL. Therefore, farmers and consultants should adapt their preventive strategies relating to PL, particularly, to the parity of the cattle.
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ISSN:2076-2615
2076-2615
DOI:10.3390/ani10060925