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Skip to Search Results- 10Graduate and Postdoctoral Studies (GPS), Faculty of
- 10Graduate and Postdoctoral Studies (GPS), Faculty of/Theses and Dissertations
- 4Agricultural, Food and Nutritional Science, Department of
- 4Agricultural, Food and Nutritional Science, Department of/Journal Articles (Agricultural, Food and Nutritional Science)
- 3Oba, Masahito (Agricultural, Food and Nutritional Science)
- 2Oba, Masahito (Agricultural, Food, and Nutritional Science)
- 1Ambrose, Divakar (Department of Agricultural, Food and Nutritional Science)
- 1Ambrose, Divakar. J. (Agricultural, Food and Nutritional Science)
- 1Ametaj, Burim (Agricultural, Food and Nutritional Science)
- 1Ametaj, Burim N. (Agricultural, Food and Nutritional Science)
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Fecal and urinary lignans, intrafollicular estradiol, and endometrial receptors in lactating dairy cows fed diets supplemented with hydrogenated animal fat, flax or sunflower seed
Download2008
Colazo, M. G., Okine, E. K. , Ambrose, D. J., Dyck, M. K., Oba, M., Thangavelu, G.
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...
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2010
Iqbal, Summera, Ametaj, Burim N., Zebeli, Qendrim
In this review article we present an overall summary of the role that high-grain/low forage diets have on rumen composition of microbiota and how changes in the diet affect the release of bacterial cell wall components that are toxic to the host. One of these toxic compounds is lipopolysaccharide...
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Fall 2012
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...
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Characterisation of bacterial microbiota of the vagina of dairy cows and isolation of pediocin-producing Pediococcus acidilactici
Download2013
Wang, Yvonne, Ambrose, Divakar J., Ametaj, Burim N., Gänzle, Michael G.
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...
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Novel Mucosal Vaccines to Improve Immune and Health Status of Periparturient Dairy Cows and Increase their Productive Potentials
DownloadFall 2013
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...
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Effects of feeding 3-nitrooxypropanol to lactating dairy cows on methane emissions, animal performance and rumen fermentation
DownloadFall 2014
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...
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Effect of porcine luteinizing hormone on intrafollicular milieu and gene expression in granulosa cells and oocytes in dairy cows
DownloadSpring 2014
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...
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Alterations of innate immunity reactants in transition dairy cows before clinical signs of lameness
Download2015
Dervishi, Elda, Hailemariam, Dagnachew, Zhang, Guanshi, Goldansaz, Seyed A., Deng, Qilan, Dunn, Suzanna M., Ametaj, Burim N.
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...
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Application of intravaginal lactic acid bacteria to lower uterine infections and improve reproductive performance of postpartum dairy cows
DownloadSpring 2015
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...
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The Effect of Risk for Subacute Ruminal Acidosis, Feeding Frequency, and Photoperiod on the Feeding Behaviour of Lactating Dairy Cows
DownloadFall 2016
Cows fed the same high-grain diet have a large variation in rumen pH and can be categorized as higher or lower risk for developing subacute ruminal acidosis (SARA). The objective of this research was to determine if differences in feeding behaviour existed between the two categories and if these...