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Nitrogen cycling in growing cattle fed maize silageGrantley-Smith, M. P. January 1985 (has links)
No description available.
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The effect of ammonia upon the metabolism of carbohydrates and amino acids in the liver of growing steers offered silageWilton, Joanne Carroll January 1989 (has links)
No description available.
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Copper metabolism and toxicity in cattle and pigsCharmley, L. L. January 1985 (has links)
No description available.
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ENVIRONMENTAL AND GENETIC INFLUENCES UPON HEPATIC AND PLASMA VITAMIN A AND CAROTENE LEVELS IN RANGE CATTLEDiven, Richard Harlan, 1933- January 1959 (has links)
No description available.
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The effect of ambient temperatures and solar radiation on vitamin A metabolism and certain blood constituents in the bovine animalPage, Harold Monroe, 1929- January 1959 (has links)
No description available.
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A study of the rate of calcium mobilization in dairy cowsFleming, John David, 1930- January 1960 (has links)
No description available.
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The effect of ACTH and heat stress upon the metabolism of selected minerals in the bovineLox, Charles Douglas, 1936- January 1970 (has links)
No description available.
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Endocrine and metabolic mediators of dietary energy status and reproduction in dairy cowsHamudikuwanda, Humphrey January 1995 (has links)
Five experiments were undertaken to identify metabolites and hormones that could mediate the effect of dietary energy status on reproduction, particularly pulsatile secretion of luteinizing hormone (LH) postpartum dairy cows. / In the first two experiments, the concentration of progesterone (P4) in tailhead adipose tissue and plasma in 12 cows at different stages of pregnancy and lactation was determined as was P4 produced in vitro by explants of tailhead adipose tissue. Concentration of P4 in adipose tissue was correlated with that of plasma P4 near estrus and during the luteal phase of the estrous cycle, and P4 was released in vitro by fat mobilization. / In the third and fourth experiments, blood was collected continuously for 16 h from four ovariectomized cows offered maintenance or restricted energy diets after priming with P4 or estradiol (E2) using a crossover experimental design. The results indicated that P4 released during body fat mobilization is minor and is not related to LH secretion. Dietary energy restriction influenced plasma LH concentration and pulse amplitude but the effect was modulated by P4 and E2 priming. Dietary energy restriction decreased glucose concentration but did not influence plasma non-esterified fatty acids (NEFA), cortisol, P4 and insulin levels. Cortisol was negatively related to LH pulse frequency. Glucose and insulin were positively and negatively correlated with LH pulse amplitude, respectively. Cortisol, NEFA and glucose jointly had a negative correlation with LH concentration. / In the fifth experiment, blood samples were collected daily for 60 d and every 10 min for 8 h on 18, 36 and 54 d postpartum from 24 cows (12 ovariectomized) fed low (1.4 Mcal/kg DM) (L) or high (1.7 Mcal/kg DM) (H) energy in a 2 x 2 factorial treatment design. LH pulse frequency was reduced at 18 d postpartum in ovariectomized cows, but not in intact cows, fed L. First postpartum ovulation occurred later in intact cows fed L compared to those fed H. Energy balance and plasma glucose concentration were lower, but plasma NEFA, $ beta$-hydroxybutyrate (BHB) and E2 concentrations higher, in cows fed L compared to those fed H. E2 concentration in intact cows fed L was elevated for a prolonged period prior to first ovulation. Diet had no influence on plasma P4 and insulin concentrations. Plasma E2 and BHB concentrations were positively correlated with LH pulse frequency in intact cows across diets and ovariectomized cows fed L, respectively. NEFA were negatively correlated with LH pulse amplitude in ovariectomized cows fed L. Glucose, NEFA and P4 were negatively, but BHB, E2 and insulin positively correlated, individually or in association, with LH concentration. / Overall, the results suggest that the effect of dietary energy status on LH patterns and timing of onset of postpartum ovulation is modulated by priming with or presence of ovarian steroids. The relationships of metabolites and hormones with LH patterns appear to change with dietary energy level, ovarian status and mutual associations among the metabolites and hormones. These parameters, especially glucose and BHB, may be potential mediators of the effect of dietary energy status on LH patterns. (Abstract shortened by UMI.)
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Endocrine and metabolic mediators of dietary energy status and reproduction in dairy cowsHamudikuwanda, Humphrey January 1995 (has links)
No description available.
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The effects of dietary cation-anion balance, stage of lactation and ration ingredients on acid base metabolism and productivity of dairy cowsDelaquis, Annick Marie January 1992 (has links)
No description available.
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