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Whilst bovine leukemia virus (BLV) causes considerable economic losses to the dairy industry worldwide, information on its molecular epidemiology and economic impact in beef cattle is limited. Here, blood from 880 animals from Zambia's major cattle-rearing provinces was screened for BLV by nested PCR. Positive pools were sequenced and phylogenetically analyzed. The estimated pooled prevalence was 2.1%. All strains belonged to genotype 1 and formed a distinct phylogenetic cluster. The study suggests circulation of genotype 1 BLV in beef cattle in these regions. This is the first report on molecular detection and characterization of BLV from beef cattle in Africa.
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http://dx.doi.org/10.1007/s00705-019-04350-6 | DOI Listing |
J Anim Sci
September 2025
Department of Animal Science, South Dakota State University, Brookings, SD 57007, USA.
Flaxseed oil contains elevated levels of omega-3 fatty acids (n-3 FA), which have been shown to impact reproductive performance. This study aimed to determine the effects of a flaxseed oil-based supplement on reproductive parameters, feeding behavior, and lipid profile in beef heifers. Sixty Angus and Simmental × Angus heifers (14 months old ± 2 months), blocked by full body weight (BW; 396.
View Article and Find Full Text PDFJ Anim Sci
September 2025
University of Kentucky, Department of Plant and Soil Sciences, Lexington, KY 40506 USA.
Livestock grazing endophyte-infected (E+) tall fescue can exhibit persistent systemic vasoconstriction and fescue toxicosis. Isoflavones in legumes, most notably red clover (RC), are known hypotensive agents. The objective of the experiment was to evaluate the effect of isoflavone supplementation via RC hay, every day or every other day (QOD), on average daily gain (ADG) of steers grazing E+ tall fescue pastures and their physiological recovery after grazing when managed on a non-toxic diet (28-d).
View Article and Find Full Text PDFJ Anim Sci
September 2025
U.S. Meat Animal Research Center, USDA, ARS, Clay Center, NE 68933, USA.
Liver abscesses are a concern in feedlot cattle, and little is known about the role of genetics in their development. This study aimed to estimate genetic parameters and to identify single nucleotide polymorphisms (SNP) associated with liver abscesses. Crossbred cattle representing 18 breeds in the United States Meat Animal Research Center Germplasm Evaluation Program were phenotyped for liver abscesses at slaughter (n = 9,044).
View Article and Find Full Text PDFJ Environ Qual
September 2025
Department of Food Science and Human Nutrition, Michigan State University, East Lansing, Michigan, USA.
Per- and polyfluoroalkyl substances (PFAS) in biosolid-amended soils can transfer and accumulate in crops, cattle, and people. Bioaccumulation factors (BAFs) are often applied to estimate the transfer of contaminants from soil to crops. However, they can vary widely and introduce uncertainty to exposure and risk estimates.
View Article and Find Full Text PDFJDS Commun
September 2025
Livestock Improvement Corporation Ltd., Newstead, Hamilton 3240, New Zealand.
SLICK1 is an allelic variant of the prolactin receptor () that is found in Senepol beef cattle. The presence of a single copy of this allele produces a short hair coat and confers heat tolerance. We aimed to determine the effect of 2 copies of this allele on milking performance of dairy cattle.
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