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Effects of peripartal rumen-derived direct-fed microbials supplementation on lactation performance, metabolism, ruminal fermentation, and microbial abundance in dairy cows.
J Dairy Sci
December 2024
Department of Dairy and Food Sciences, South Dakota State University, Brookings, South Dakota 57007; School of Animal Sciences, Virginia Tech, Blacksburg, VA. Electronic address:
The objective of this study was to evaluate the effects of a rumen-derived direct-fed microbial (DFM) product on performance, blood biomarkers, ruminal fermentation, and bacterial abundance in dairy cows during the transition period until 100 DIM. Fifty-six Holstein cows were enrolled in a randomized complete block design from -21 to 100 DIM. Cows were blocked based on expected calving date, parity, and previous lactation milk yield for multiparous or genetic merit for primiparous cows.
View Article and Find Full Text PDFMetabolic profile of prepartum dairy cows and its influence on the immediate postpartum period, colostrum quality and passive immunity transference.
Vet J
December 2024
Professional Master's Degree in Animal Production and Health, Instituto Federal Catarinense, Campus Araquari, Santa Catarina 89245000, Brazil; Research, Education and Extension Nucleus in Animal Production (NEPPA), Instituto Federal Catarinense, Campus Araquari, Santa Catarina 89245000, Brazil. Electronic address:
The objective of this study was to evaluate which biochemical markers in the prepartum period of dairy cows influence the immediate postpartum period, the quality of colostrum, and the passive immunity transference in the calves. The experiment was performed on a commercial dairy farm with 52 pregnant multiparous Holstein cows. Animals that gave birth to twins or males were discarded from the experiment.
View Article and Find Full Text PDFA genomic analysis of twinning rate and its relationship with other reproductive traits in Holstein-Friesian cattle.
J Dairy Sci
February 2025
Animal & Grassland Research and Innovation Centre, Teagasc, Moorepark, Fermoy, Co. Cork P61 P302, Ireland.
Twin births in dairy cattle is generally unfavorably associated with reproductive performance and calf survival in dairy cows. Genetic selection to reduce twinning rate in dairy cattle may be desirable, provided no undesirable correlated responses in other traits exist. The current study was undertaken to characterize the genomic architecture of twinning rate in the Irish Holstein-Friesian population, and to quantify the genetic relationship of twinning with other reproductive traits and milk yield.
View Article and Find Full Text PDFEfficiency of Utilizing Bulls with High Immune Response (HIR) in Terms of Reproductive Traits of PHF Cows.
Animals (Basel)
July 2024
Department of Animal Biotechnology and Genetics; Faculty of Animal Breeding and Biology, Bydgoszcz University of Science and Technology, Mazowiecka 28, 85-084 Bydgoszcz, Poland.
Reproductive traits in dairy cattle are crucial for herd productivity and profitability. This study investigates the influence of relatedness to high immune response (HIR) Immunity+ sires on reproductive performance indicators in Polish Holstein-Friesian cows. A total of 5094 cows were analyzed, categorized based on their relatedness to HIR Immunity+ sires, and assessed for various reproductive parameters, including age at first insemination, gestation length, days open, calving interval, and calving ease.
View Article and Find Full Text PDFTwin pregnancies compromise the health and well-being of dairy cattle. A recent genomic prediction model for twin pregnancies has been developed based on twin calving or abortion. However, the incidence of double ovulation is significantly higher than that of twin births.
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