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Genetic parameters for milk production traits of Simmental cows with random regression test-day model.
Animal
December 2024
National Research Institute of Animal Production, ul. Krakowska 1, 32-083 Balice, Poland.
Precise genetic parameter estimates can allow the breeding value evaluation to be adjusted to meet European requirements and to enable participation in the international evaluation of Simmental bulls conducted by Interbull. Genetic parameters were estimated for a multitrait multilactation random regression test-day model for milk in Simmental cattle in Poland. Data came from the official Polish national recording system.
View Article and Find Full Text PDFThe association of lung consolidation and respiratory pathogens identified at weaning on the growth performance of beef on dairy calves.
J Dairy Sci
January 2025
Department of Animal Science, Penn State University, University Park, PA, USA. Electronic address:
This observational study evaluated the relationship between lung consolidation observed at weaning and calf ADG, and the association of pathogen shedding at weaning on ADG in beef × dairy calves up to 238 d. Beef × Holstein calves (n = 143) were sourced from 2 dairies. Calves were managed in 3 cohorts and fed milk replacer and calf starter preweaning.
View Article and Find Full Text PDFDetection of genetic variability in dairy cattle infectivity for bovine tuberculosis.
J Dairy Sci
January 2025
The Roslin Institute and Royal (Dick) School of Veterinary Studies, University of Edinburgh, Midlothian EH25 9RG, United Kingdom. Electronic address:
This study investigated the genetics of bovine tuberculosis (bTB) infectivity in Holstein-Friesian dairy cows using British national data. The analyses included cows with recorded sires from herds affected by bTB outbreaks between 2000 and 2022. Animals were considered bTB-positive if they reacted positively to the skin test and/or had positive post-mortem findings.
View Article and Find Full Text PDFUnexpected recombination at the polled locus in a horned Holstein calf from the mating of a homozygous polled sire and a heterozygous polled cow.
Anim Genet
February 2025
Institute of Veterinary Medicine, University of Göttingen, Göttingen, Germany.
In this study, I report an unexpected case of a Holstein calf that developed horns even though the sire was homozygous and the dam was heterozygous for polledness. After verifying and confirming the correct parentage, the parents and offspring were genotyped with the Illumina EuroG_MD BeadChip and the SNPs in the polled region on chromosome 1 were evaluated. In addition, the father was sequenced with next generation sequencing to identify possible, previously unknown variants.
View Article and Find Full Text PDFGenomic analysis of mobility measures on 5-month-old gilts associated with structural soundness.
J Anim Sci
January 2025
USDA-Agricultural Research Service, U.S. Meat Animal Research Center (USMARC), Clay Center, NE, USA.
Sow lameness results in premature culling, causing economic loss and well-being issues. A study, utilizing a pressure-sensing mat (GAIT4) and video monitoring system (NUtrack), was conducted to identify objective measurements on gilts that are predictive of future lameness. Gilts (N = 3656) were categorized to describe their lifetime soundness: SOUND, retained for breeding with no detected mobility issues; LAME_SOW, retained for breeding and detected lame as a sow; CULL_STR, not retained due to poor leg structure; LAME_GILT, not retained due to visible signs of lameness; and CULL, not retained due to reasons other than leg structure.
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