Pregnant heifers in the feedlot pose many economic and management issues to the producer. Heifers that enter the feedlot pregnant will have increased costs associated with them regardless of the management strategy implemented. It is imperative that practitioners be aware of management concerns associated with pregnant heifers in order to provide sound recommendations for their clients. The purpose of this article is to provide the bovine practitioner with a summary of current literature and present common options for managing pregnant heifers in a feedlot setting.
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Genomic Regions Associated with Spontaneous Abortion in Holstein Heifers.
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Department of Animal Sciences, Washington State University, Pullman, WA 99164, USA.
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- - A genome-wide association analysis (GWAA) identified 216 loci and 413 candidate genes linked to SA in artificially inseminated Holstein heifers, while no significant loci were found for embryo transfer recipients.
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Late gestation heat stress alters O regulation in placenta and neonatal heifers.
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January 2025
Department of Animal Sciences, University of Florida, Gainesville, USA. Electronic address:
Introduction: Maternal hyperthermia (i.e. heat stress) can adversely affect placental development and function, with severity varying based on pregnancy stage.
View Article and Find Full Text PDFLate-gestation heat stress alters placental structure and function in multiparous dairy cows.
J Dairy Sci
January 2025
Department of Animal Sciences, University of Florida, Gainesville, FL 31608. Electronic address:
The placenta plays a pivotal role in fetal development and the dam's subsequent lactation performance, because it facilitates nutrient transfer, heat dissipation, and gas exchange with the growing fetus, and regulates key hormones essential for mammary gland development. Heat stress experienced during gestation and lactation can significantly reduce the placenta's capacity to perform these critical functions. To investigate the impact of heat stress, trials were conducted over the summer months of 2020, 2022, and 2023 in Florida.
View Article and Find Full Text PDFEfficacy of Vaccination with the DIVENCE Vaccine Against Bovine Viral Diarrhea Virus Types 1 and 2 in Terms of Fetal Protection.
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Hipra Scientific S.L.U., R&D Department, Amer, Spain.
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Field Center of Animal Science and Agriculture, Obihiro University of Agriculture and Veterinary Medicine, Obihiro, Hokkaido, 080-8555, Japan.
The energy status of dams during the early stages of gestation may affect ovarian reserves. It was hypothesized that greater milk yield and composition during the early stages of gestation may suppress the number of primordial follicles in the fetuses of dairy cattle. This study aimed to evaluate the anti-Müllerian hormone (AMH), used as an indicator of ovarian reserves, in female Holstein calves immediately after birth.
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