| Autor: |
Fernandez-Novo A; Dpto. Producción y Sanidad Animal, Salud Pública Veterinaria y Ciencia y Tecnología de los Alimentos, Facultad de Veterinaria, Universidad CEU Cardenal Herrera, C/Tirant lo Blanc, 7, 46115 Alfara del Patriarca, Valencia, Spain., Fargas O; VAPL S.L., C/Antoni Figueras 20, 08551 Tona, Barcelona, Spain., Loste JM; Akaborro s/n., 31860 Navarra, Spain., Sebastian F; Cowvet SL, Avda. País Valenciano 6, 5, 46117 Betera, Valencia, Spain., Perez-Villalobos N; Facultad de Ciencias Biomédicas, Universidad Europea de Madrid, C/Tajo s/n, 28670 Villaviciosa de Odón, Madrid, Spain., Pesantez-Pacheco JL; School of Veterinary Medicine and Zootechnics, Faculty of Agricultural Sciences, University of Cuenca, Avda. Doce de Octubre, 010150 Cuenca, Ecuador., Patron-Collantes R; TRIALVET S.L., C/Encina 22, Cabanillas de la Sierra, 28721 Madrid, Spain., Astiz S; Dpto. Reproducción Animal (INIA), Avda. Puerta de Hierro s/n., 28040 Madrid, Spain. |
| Abstrakt: |
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; p = 0.04) and multiparous (15.3%; OR = 2.02, p < 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, p = 0.01). First AIs related to higher PL than ≥2nd AIs (PL = 13.8% vs. 11.2; OR = 0.73, p < 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. |
