Cow-related factors associated with intramammary infections during the 1st week postpartum in primiparous dairy cows in certified organic herds.

Autor: Fernandes L; Department of Veterinary Sciences, Texas Tech University, Lubbock, TX 79415 USA., Celestino ML; Department of Veterinary Sciences, Texas Tech University, Lubbock, TX 79415 USA., Menta PR; Department of Veterinary Sciences, Texas Tech University, Lubbock, TX 79415 USA., Silva TH; Department of Veterinary Sciences, Texas Tech University, Lubbock, TX 79415 USA; Department of Animal Science, School of Animal Science and Food Engineering, University of Sao Paulo, Pirassununga, SP 13635-900, Brazil., Paiva D; Department of Veterinary Sciences, Texas Tech University, Lubbock, TX 79415 USA., Ribeiro TL; Department of Veterinary Sciences, Texas Tech University, Lubbock, TX 79415 USA., Caixeta LS; Department of Veterinary Population Medicine, University of Minnesota, St. Paul, MN 55108 USA., Noyes NR; Department of Veterinary Population Medicine, University of Minnesota, St. Paul, MN 55108 USA., Machado VS; Department of Veterinary Sciences, Texas Tech University, Lubbock, TX 79415 USA. Electronic address: vinicius.machado@ttu.edu.
Jazyk: angličtina
Zdroj: Veterinary journal (London, England : 1997) [Vet J] 2022 Apr; Vol. 282, pp. 105822. Date of Electronic Publication: 2022 Mar 22.
DOI: 10.1016/j.tvjl.2022.105822
Abstrakt: The objectives if this exploratory study were to identify variables associated with intramammary infections (IMI) during the 1st week of lactation in primiparous organic dairy cows, and to evaluate the association of those variables with somatic cell count (SCC) linear scores and milk yield in early lactation. Nulliparous cows (n = 240) were evaluated for: udder edema, teat edema, milk leakage (ML) and udder hygiene at weeks 6, 4, 2, and 1 prepartum and 1st week postpartum; body condition score (BCS) at 6 weeks prepartum and 1st week postpartum; age at calving (days), gestation length, dystocia, stillbirth, calf sex were included in the analysis. Milk samples from the 1st week postpartum were cultured using standard laboratory techniques and bacterial growth was considered IMI. Intramammary infection was observed in 58.7% of cows, with Staphylococcus chromogenes and S. aureus being the most prevalent pathogens. Cows with ML at 1st week postpartum were at 3.42 greater odds of IMI (P < 0.01). Cows with prepartum BCS ≥ 3.75 were at 3.12 greater odds of IMI (P < 0.01). Cows with ML in the 1st week of lactation had increased SCC (P < 0.01) and lower milk production in the second month of lactation (P = 0.05). Intervention studies are needed to evaluate if monitoring prepartum BCS and ML at early postpartum can aid in the control of IMIs in heifers in organic dairies.
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Databáze: MEDLINE
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