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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 39 for “"dairy herd"”.
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Milk Yield as a Factor in Dairy Herd Management by Exception
Made available in DSpace on 2014-12-14T06:37:07Z (GMT). No. of bitstreams: 1 7606807.pdf: 5064144 bytes, checksum: fe4c03765b7c34ddad69455241a2fe57 (MD5) Previous issue date: 1975
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Comparison of three estrus detection systems during summer heat stress in a large commercial dairy herd
… of these systems on a large commercial dairy (1000 lactating cows) during stress of summer heat. At 37 to 45 days in milk (DIM), 266 cows were fitted with a HeatWatch (HW) device (HeatWatch; DDx Inc., Boulder, CO), an activity (A) sensor (ALPRO; DeLaval Inc., Kansas City, MO), and …
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Management of Length of Lactation and Dry Period to Increase Net Farm Income in a Simulated Dairy Herd
A computerized dairy herd simulation was developed to evaluate the economic impact of changing 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 …
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IMPROVING REPRODUCTIVE PERFORMANCE THROUGH THE DEVELOPMENT OF A DAIRY HERD INDEX, INTRAUTERINE HORMONE DELIVERY OR INSEMINATION TECHNIQUE IN LACTATING COWS
Improving reproductive performance of dairy cattle is paramount to maximize productivity and sustainability of dairy operations. The present dissertation includes three specific aims containing a series of five experiments (Chapters) aimed at improving reproductive performance in lactating dairy …
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Yearly Environmental and Genetic Changes in the Yield of Fat Corrected Milk Within a Dairy Herd From 1901 to 1954
Made available in DSpace on 2014-12-05T23:07:51Z (GMT). No. of bitstreams: 1 0016388.pdf: 2927513 bytes, checksum: 719ddfd3a870c2263f098e20ebc48127 (MD5) Previous issue date: 1956
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Nitrous oxide and methane emissions from agriculture and approaches to mitigate greenhouse gas emissions from livestock production
… may be lessened by increasing the longevity of dairy cows, thereby decreasing the proportion of unproductive replacement animals in the dairy herd. Sourcing a larger proportion of calves from the dairy herd would decrease emissions of GHGs from beef production. The distance between the region of …
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Effectiveness of on-farm screening tests for detection of antibiotic residues and control of mastitis through antibiotic therapy based on somatic cell counts
… and urine was examined using the Virginia Tech dairy herd. Milk samples from treated cows were collected 72 hours post treatment and tested for residues by the Bacillus stearothermophilus Difco disc assay, the Delvotest-P, and the Penzyme test. Urine of cull cows was collected and tested with …
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Effects of within herd variation on the relationship between genetic evaluations and performance of offspring
1,032,438 Jersey and 1,162,578 Holstein official Dairy Herd Improvement Association (DHIA) records from 20,380 and 34,000 herd-years, respectively, were used to compute herd-year means and within herd-year standard deviations for individual mature equivalent (ME) milk, fat, and fat percent. These …
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Big data and machine learning tools to understand mastitis epidemiology and other topics
… understand health and disease in both humans and dairy cattle. Data collected through routine observations such as doctor or veterinary visits, milking equipment, or remote sensors can be successfully incorporated to monitor and manage individual and public health, and support operational …
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The use of activity measures in combination with physiological factors as indicators of disease in dairy cattle
… can be used for early disease detection in dairy cattle. An initial study determined the impact of flunixin meglumine (FM), a non-steroidal anti-inflammatory drug, on activity measures, dry matter intake (DMI) and milk production during experimentally induced Escherichia coli mastitis. A …
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An analysis of the influences of changes in herd size and certain other management factors on milk production and income over feed cost in eastern dairy herds
1380 Guernsey, 13614 Holstein, and 804 Jersey Dairy Herd Improvement yearly herd averages collected in eight Eastern and Southeastern states between 1965 and 1970 were analyzed to determine their value as management tools, identify recent trends in the dairy industry, and identify short term …
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Periconceptional Heat Stress of Holstein Cows Affects Subsequent Production Parameters Measured During Adulthood
… and thermoneutral-conceived (TNC) cows. National Dairy Herd Improvement Association data was obtained from Dairy Records Management Systems. Records (n =14,189,891) included cows born between 1977 and 2010 in FL, GA, SC, MS, LA, AL, and TX. Records were edited to include only Holsteins born …
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A Five State Survey of Heifer Management Practices on Dairy Farms and Virginia Custom Dairy Heifer Growing Operations
… surveys evaluated heifer management practices in dairy herds and custom grower operations. The NC-119 Heifer Management Survey conducted through the North Central Regional Research Project 119 included 226 Holstein and 67 Jersey herds from MN, MO, PA, VA, and WA. Mean rolling herd average for milk …
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A study of neoplasms
… several years thirteen cows have died in the dairy herd at the Virginia Polytechnic Institute of malignant tumors of the lymphoid type. In view of research with respect to cancers of various types in man, any information relating to tumors acquired in this study should be of value not only to …
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Analysis Of Factors Affecting The Technical Efficiency Of Smallholder Dairy Farmers In Njombe District
This study was conducted in nine dairy cattle keeping villages of Njombe District Council (NDC) with the overall objective of estimating Technical Efficiency (TE) and analyzing factors influencing Technical Inefficiency (TI) of smallholder dairy farmers. Cobb-Douglas stochastic frontier production …
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Isolation and Characterization of Fatty Acid Binding Protein From Lactating Bovine Mammary Gland
… at slaughter from five cows from the University dairy herd which were producing 5-25 kg milk/day. The tissue was homogenized and centrifuged to obtain the cytosolic and microsomal fractions. FABP was isolated from the cytosolic fraction by gel filtration on a Sephadex G-75 column followed by ion …
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Development of an expert system for the evaluation of reproductive performance and management of Virginia dairy farms
An expert system for dairy herd reproductive management for microcomputer was developed using an expert system shell and Turbo Pascal. A dairy extension reproductive specialist provided information for the system and empirical support was provided by research. The expert system initially examines …
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An investigation into temperament, production, and their physical indicators in Bos taurus beef and Holstein dairy cattle
… group studied were cows at a small Holstein dairy. A simple method to determine the temperament of dairy cows, without interfering with the operation of a commercial dairy, was developed. The second group studied were feedlot heifers that were simultaneously involved in a vitamin D3 study. …
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Prevention of bovine mastitis
Mastitis in dairy cows has for many years received attention from Veterinary scientists, more so than any other if the common diseases of cattle. The less occasioned by infection of the mammary gland has cost the dairy industry an enormous amount through loss of milk, use of antibiotics and culling …
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