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The objectives of this study were to evaluate metabolic and innate immunity alterations in the blood of transition dairy cows before, during, and after diagnosis of lameness during periparturient period. Blood samples were collected from the coccygeal vain once per week before morning feeding...
Application of intravaginal lactic acid bacteria to lower uterine infections and improve reproductive performance of postpartum dairy cowsDownload
Transition dairy cows are susceptible to uterine infections due to the compromised immunity around calving and substantial bacterial contamination in the uterus immediately after calving. Cows with uterine infections are at higher odds of developing other periparturient diseases, resulting in...
Characterisation of bacterial microbiota of the vagina of dairy cows and isolation of pediocin-producing Pediococcus acidilacticiDownload
Background Uterine infections in dairy cows lower profitability of dairy operations. Infections of the reproductive tract are related to the overgrowth of pathogenic bacteria during the first three weeks after parturition. However, alterations in the vaginal microbiota composition in the first...
Effect of porcine luteinizing hormone on intrafollicular milieu and gene expression in granulosa cells and oocytes in dairy cowsDownload
In previous research, the use of porcine luteinizing hormone (pLH) in lieu of gonadotropin-releasing hormone (GnRH) for synchronizing ovulation in a fixed-timed artificial insemination protocol in dairy cows improved pregnancy rates (42 vs 28%) without increasing progesterone concentrations. The...
The goals of this research were to evaluate the interaction effects between photoperiod management and dietary grain allocation in lactating dairy cows and to determine if any relationships exist between photoperiod management and the persistency of lactation in selected dairy herds in Alberta....
Effects of feeding 3-nitrooxypropanol to lactating dairy cows on methane emissions, animal performance and rumen fermentationDownload
Methane emissions from ruminants are of great concern as they contribute to greenhouse gasses emitted within the atmosphere. The objective of this research was to evaluate a novel biochemical compound, 3-nitrooxypropanol, on its ability to reduce methane emissions and its impact on animal...
Sub-acute ruminal acidosis is a digestive disorder experienced by animals fed a high grain diet, and causes substantial economic loss to the dairy industry. The objective of this research was to evaluate novel approaches to manage and prevent sub-acute ruminal acidosis. In Study 1, I found that...
Fecal and urinary lignans, intrafollicular estradiol, and endometrial receptors in lactating dairy cows fed diets supplemented with hydrogenated animal fat, flax or sunflower seedDownload
We hypothesized that the inclusion of flaxseed in the diets of lactating dairy cows will increase urinary and fecal concentrations of the lignans, secoisolariciresinol diglycoside (SDG), enterolactone and enterodiol, reduce intrafollicular concentrations of IGF-I and estradiol, and subsequently...
Identification of biomarkers associated with the onset and progression of ketosis in transition dairy cowsDownload
Ketosis is a common metabolic disorder of transition dairy cows during the early lactation period. Cows with ketosis have lower milk yield and reproductive performance, greater risk of other periparturient diseases, and higher culling rate. Although ketosis has been extensively studied, not many...
Novel Mucosal Vaccines to Improve Immune and Health Status of Periparturient Dairy Cows and Increase their Productive PotentialsDownload
The transition period is critical for the health and productivity of dairy cows. Feeding high-grain diets immediately after parturition is necessary to support high milk production. However, high-grain diets are associated with acidic rumen pH and alterations in the composition of rumen...