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Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
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Showing 1 to 20 of 76 for “"dry period"”.
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Paleoecological Analyses of the Late Holocene Dry Period in the Northwestern Great Basin, Nevada
… evidence that the basin has gone through periods of amelioration from low precipitation followed by a return to dry conditions through the Holocene. Relative to the Pleistocene/Holocene transition and middle Holocene, aside from the Medieval Climate Anomaly, study of the late Holocene has …
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Dry Period Nutrition and Hepatic Metabolism of Fatty Acids and Glucose in Transition Dairy Cows
… metabolism in vitro. During the far-off period, d -60 to -25, cows received a low energy control diet fed ad libitum (100NRC) to meet National Research Council (2001) nutrient requirements, a moderate-energy diet fed ad libitum to exceed NRC recommendations for NE L by >50% (150NRC), or …
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Dry period plane of energy and periparturient health condition: Effects on production and metabolic responses
Overconsumption of energy during the dry period has been linked to metabolic disorders during early lactation. Controlled energy, high fiber diets during the dry period have been shown to decrease postpartal body lipid mobilization, concentrations of non-esterified fatty acids (NEFA) and …
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Photoperiod and Temperature-Humidity Index during the Dry-Period Impact Colostrum and Milk Production in Dairy Cattle
… Based on previous literature showing that photoperiod impacts milk yield post-calving in dry cows and that light intensity and temperature-humidity index (THI) impact colostral Ig content, I hypothesized that photoperiod and THI during the dry period impact colostrum yield and quantity in …
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Peripartal Lipid Metabolism and Tissue Fatty Acid Composition in Holstein Cows Fed Supplemental Fat During the Dry Period
… after attempting to add BCS by feeding fat to dry cows. Results were confounded; feeding supplemental fat to dry cows was associated with lower DMI and BCS loss. Consequently, 36 cows were fed high-grain or fat-supplemented diets to reassess the effects of feeding supplemental fat to dry cows …
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Management of Length of Lactation and Dry Period to Increase Net Farm Income in a Simulated Dairy Herd
… length of lactation relative to length of dry period in a dairy herd. It created weekly production for individual cows in a typical herd. Cows were dried off early if they were producing below a designated daily milk yield. They were replaced with fresh cows to produce more daily milk and …
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Management during the dry period and its effect on hepatic and adipose tissue molecular biomarkers of metabolism and health in grazing dairy cows
… reproduction, and health. The peripartum period is characterized by an inflammatory state that, if not controlled, could be detrimental to the cow. The first experiment examined hepatic and adipose gene expression in response to injections of a non-steroidal anti-inflammatory compound …
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Effect of dry period diets varying in energy density on health and performance of periparturient dairy cows: a study of dry matter intake, lactation performance, fertility, blood parameters and liver condition
… with different energy levels in the close-up dry period (3-0 weeks prepartum) on different production and health parameters were examined around parturition of 30 Icelandic cows and heifers in individual tie stalls. Dry matter intake (DMI) was registered, lactation performance, i.e. milk yield …
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Proteolysis of mammary secretion proteins during involution of bovine mammary gland
In cattle, during the early dry period the mammary gland undergoes a process of involution. The profile of mammary secretion proteins changes throughout the dry period. Increased proteolytic activity and breakdown fragments of milk proteins contribute to the composition of mammary secretions during …
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Photoperiodic Effects on Immune Function in Dairy Cattle: Potential Mediation Through Prolactin and Its Receptor
Photoperiod management is known to affect physiological changes in many species. These experiments were designed to examine physiological effects of photoperiod on dairy cattle, with particular emphasis on the immune system. The mechanism whereby photoperiod alters immune function was also …
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Effects of feeding moderate-energy high-forage diets with reduced DCAD for twenty-one or forty-two days prepartum on mineral homeostasis and postpartum performance
… would allow producers to utilize a one group dry cow pen; reducing social stress on cows while providing protection against hypocalcemia. High-fiber prepartum diets including wheat straw are inherently low in potassium and have been shown to reduce risk of hypocalcemia. Few studies examine …
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Strategies to Decrease Incidence of Fatty Liver in Dairy Cows
… diets or were overfed energy (OVERFED) from dry-off to parturition, or CEHF for the first 40 d after dry-off, followed by OVERFED for the last approximately 20 d before parturition (2-stage). During the periparturient period, cows fed CEHF had lower lipid accumulation in the liver than …
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The effect of selection for milk yield on net energy balance and plasma concentrations of endogenous hormones and metabolites in primiparous Holsteins
… 45, 90, 180 d postpartum (dpp) and 14 d of the dry period over a 7 h period via jugular cannulae. After 2.5 h of blood collection, growth hormone releasing factor (GRF) was administered at 0, 45, 180 dpp and 14 day of the dry period, while epinephrine was administered at 90 dpp. Nonesterified …
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Effect of body condition and ration protein source on performance of high producing cows during early lactation
… Cows were fed to maintain condition during the dry period. During weeks 3-15 of the next lactation, half the cows in each condition group (fat or thin) were fed a mixed ration with soybean meal (SBM) as the major protein source. The remaining cows were fed a ration with dried brewers grains …
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Nutritional modulation of the transcriptome in adipose, liver, and polymorphonuclear leukocytes in peripartal dairy cows
… 2) evaluate the effect of overfeeding during the dry period on the PMNL transcriptome. In the first study, cows were either 1) retrospectively classified as having high (HI; BCS > 3.75) or low (LO; BCS < 3.25) BCS at -3 wk from parturition, or 2) assigned to a control (CON) or …
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Effectiveness of Porous Pavement and an Infiltration Trench as Urban Best Management Practices
… urban parking lot area. In addition, wetfall and dryfall were found to be the major contributors to the runoff loading and yet were not comparable to associated studies. Peak and total flow runoff volumes were reduced significantly thereby reducing the overall pollutant loading. Antecedent dry …
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Forest Mortality in Lake Tahoe Basin from 1985-2010: Influences of Forest Type, Stand Density, Topography and Climate
… has differed among five forest types and wet and dry climatic periods. This part of the project uses annual maps of forest mortality (Plates 1-2) and an index of stocking level, a proxy for stand density, derived from classification of remotely sensed imagery. Logistic regression is then used to …
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1300 Years of Snowpack Change for the Sangre de Cristo Mountian Range
… regression models. All models share a common period of 1955–85 CE with forward (1985–2014 CE) and backward (1955–630 CE) nests extending out temporally. The optimal calibration period (1955–85 CE) explains 64% of the variance in the instrumental record. The instrumental period is statistically …
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Immune function, gene expression, blood indices and performance in transition dairy cows affected by diet and inflammation
The transition period is associated with the peak incidence of production problems, metabolic disorders and infectious diseases in dairy cows (Drackley, 1999). During this time the cow’s immune system seems to be weakened; it is apparent that metabolic challenges associated with the onset of …
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