دورية أكاديمية

A randomized, controlled trial examining quarter-level somatic cell count and culture-based selective dry cow therapy against blanket dry cow therapy on early lactation production outcomes

التفاصيل البيبلوغرافية
العنوان: A randomized, controlled trial examining quarter-level somatic cell count and culture-based selective dry cow therapy against blanket dry cow therapy on early lactation production outcomes
المؤلفون: K. D'Amico, R.C. Neves, J.M. Grantz, N. Taechachokevivat, A. Ueda, A. Dorr, A. Hubner
المصدر: Journal of Dairy Science, Vol 107, Iss 9, Pp 7201-7210 (2024)
بيانات النشر: Elsevier, 2024.
سنة النشر: 2024
المجموعة: LCC:Dairy processing. Dairy products
مصطلحات موضوعية: dry cow therapy, intramammary infection, cell count, on-farm culture, Dairy processing. Dairy products, SF250.5-275, Dairying, SF221-250
الوصف: ABSTRACT: The objective of this study was to determine quarters requiring antimicrobial treatment using either a benchtop somatic cell counter or culture with gram-positive selective media and compare the outcomes in these cows to those receiving blanket dry cow therapy (BDCT) in a randomized, controlled trial. We evaluated 2 novel methods of identifying cows with intramammary infections followed by selective antimicrobial treatment at a commercial dairy farm to determine their usefulness in decreasing antibiotic usage during the dry period without significant detrimental effects on milk quality and production. Cows (n = 840) were randomly allocated to one of 3 groups (BDCT, gram-positive selective media culture-based selective dry cow therapy [C-SDCT], and somatic cell count-based SDCT [S-SDCT]) the day before dry-off, and quarter-level milk samples (QLMS) were collected. The QLMS from cows in the S-SDCT group were evaluated using the cell counter, and quarters were treated if SCC was ≥200,000 cells/mL, whereas the QLMS from cows in the C-SDCT group were cultured, and quarters were treated if the culture showed growth. All cows in the BDCT received antimicrobial therapy, and all cows received an internal teat sealant regardless of treatment group. Outcomes measured were first and second DHIA test SCC, milk production through 60 DIM, cows leaving the farm, clinical mastitis, and bacteriologic new infections in a subset of quarters. Cows in both SDCT groups had fewer antimicrobial treatments than cows in the BDCT group as was expected, and cows in the C-SDCT group had fewer treatments than those in the S-SDCT group. Cows in both SDCT groups had a higher linear score at the first DHIA test (BDCT: 1.8, S-SDCT: 2.2, C-SDCT: 2.2); however, we found no other differences between groups regarding any other outcomes measured. Although antimicrobial use was significantly reduced, farms should use caution in adopting the benchtop analyzer and the selective media described in this study as ways to identify infected cows for dry cow therapy because they may result in increased linear scores early in lactation.
نوع الوثيقة: article
وصف الملف: electronic resource
اللغة: English
تدمد: 0022-0302
Relation: http://www.sciencedirect.com/science/article/pii/S0022030224007963; https://doaj.org/toc/0022-0302
DOI: 10.3168/jds.2023-24188
URL الوصول: https://doaj.org/article/bf9f6c7fac9b4874adb79187b54b04a1
رقم الأكسشن: edsdoj.bf9f6c7fac9b4874adb79187b54b04a1
قاعدة البيانات: Directory of Open Access Journals
الوصف
تدمد:00220302
DOI:10.3168/jds.2023-24188