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Full-Text Articles in Life Sciences
Effects Of Weaning Transition And Ionophore On Metabolic Profile And Portal And Hepatic Nutrient Flux During Pre- And Post-Weaning Growth In Dairy Calves, James Levi Klotz
Effects Of Weaning Transition And Ionophore On Metabolic Profile And Portal And Hepatic Nutrient Flux During Pre- And Post-Weaning Growth In Dairy Calves, James Levi Klotz
Doctoral Dissertations
Dairy calf weaning is associated with increases in ketone levels that exceed measured rates of utilization in adults and present a potential energy loss that may be mitigated by ionophores. Therefore, effects of weaning and ionophore supplementation on nutrient metabolism and growth in dairy calves pre- and post-weaning were examined in two experiments. The first experiment consisted of 24 Jersey bulls calves blocked in groups of two according to birth date and weight and randomly assigned to receive either a commercial pelleted starter (CON), or the same diet containing lasalocid (TRT; 83 mg/kg DM) to examine effects of weaning transition …
Influence Of Diets Formulated To Increase The Supply Of Ketones Or Ketone Precursors On The Carbohydrate Status And Performance Of Transition Dairy Cows, Jeffrey Michael Defrain
Influence Of Diets Formulated To Increase The Supply Of Ketones Or Ketone Precursors On The Carbohydrate Status And Performance Of Transition Dairy Cows, Jeffrey Michael Defrain
Electronic Theses and Dissertations
Research to date has focused on increasing the supply of glucose precursors in transition dairy cows to reduce ketosis. Ketones and ketone bodies represent energy sources for body tissues; therefore, conserving blood glucose for lactose synthesis in the mammary gland. This led to the hypothesis that transition cows might benefit from diets formulated to stimulate rumen epithelial ketogenesis or dietary ingredients supplying ketone precursors. A series of experiments were conducted to study the impact of diets formulated to increase the supply of ketones (via feeding lactose, glycerol, or an alphaamylase enzyme preparation) or ketone precursors (feeding Ca soaps of longchain …
Efficacy Of Prepartum Intramammary Lactating Cow Treatment In Dairy Heifers, Christopher B. Norman
Efficacy Of Prepartum Intramammary Lactating Cow Treatment In Dairy Heifers, Christopher B. Norman
LSU Master's Theses
Mastitis in prepartum dairy heifers has been recognized as a significant economic problem for the dairy industry. Intramammary infusion of cephapirin sodium was completed in 20 treatment animals and the results were compared to 25 non-treated control animals. Bacteriological data from the quarter milk samples were used to determine and compare initial infection rates and cure rates following calving between treatment and control groups. Comparisons were also made between groups for differences in reproductive performance, milk yield, somatic cell count and milk ketone concentration. Milk yield did not differ between groups for either DHIA monthly average kg/day, 305 day actual …
Effects Of Dietary Protein Level And Fish Meal On Growth And Hormonal Status Of Weaned Dairy Calves, Patricia Terrell Richardel
Effects Of Dietary Protein Level And Fish Meal On Growth And Hormonal Status Of Weaned Dairy Calves, Patricia Terrell Richardel
LSU Master's Theses
Eight weaned Holstein steers approximately 4 mo of age (mean BW = 119.47 ± 2.65 kg) were used in a replicated 4 x 4 Latin square designed experiment to study the effects of protein source and level on performance and anabolic hormonal status of weaned dairy calves. Treatments consisted of two diets containing either 16 or 20 % crude protein (CP) with or without fish meal (FM). Experimental diets were corn silage based with soybean meal (SBM) as the source of ruminal degradable protein and FM as the source of ruminal undegradable protein. The animals were fed their respective diets …