Global ETD Search
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 14 of 14 for “"cattle breeding"”.
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Illinois dairy cattle breeding practices and costs
Submission original under an indefinite embargo labeled 'Open Access'. The submission was exported from vireo on 2024-03-01 without embargo terms
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Evaluating long term benefits of genomic selection programs in beef cattle breeding programs in Western Canada
… selection programs in natural service multi-sire breeding programs in Western Canada. A total of 24 breeding groups and 117 sires (some repeated) were followed over 6 breeding and calving years to determine the association between sire performance over multiple years, number of calves sired, calf …
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Mathematical models of immune responses following vaccination with application to Brucella infection
… have successfully eradicated brucellosis in cattle by applying vaccines, improving the hygienic standards in cattle breeding, and slaughtering or quarantining infected animals. The large economical impact of bovine brucellosis and its virulence for humans, coming in direct contact to fluid …
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Produção e qualidade do leite de vacas primiparas (alimentas) com diferentes níveis de ácido tânico
… the diet. The experiment was carried out in the cattle breeding sector, at the Agrarian Sciences Center of the Federal University of Paraíba, from February to May 2015, with a duration of three months. The experiment was divided into five periods of milk collection, with 20 days each, 15 days for …
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Caracterização dos motivos de descarte e estimativas de parâmetros genéticos para longevidade de vacas da raça holandês
… can improve management and selection in dairy cattle breeding programs. This study evaluated 34 culling reasons in Holstein dairy herds. Data from 3,096,872 Holstein cows culled in 9,683 Canadian herds between 1996 and 2020 were analyzed. The main culling reasons were reproductive problems …
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Genetic Heterogeneity of Residual Variance for Production and Functional Traits in American Angus Cattle
Beef cattle are continuously selected for different traits and the success in improving these traits has been remarkable. However, for certain traits, it is essential not only to improve the average performance, but also to control the variation around the mean. There is evidence that residual …
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Human anxieties, bovine solutions: Political subtexts of native cattle conservation in north-eastern Siberia
… of the Sakha people are closely bound up with cattle. I argue that cattle are now coming to be used as a metaphor for the Sakha people themselves, to create a new and powerful ethnonationalist discourse. This focuses on a distinctive local breed, which under Soviet technocratic agriculture was …
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The Influence of Artificial Insemination in Three Midwestern States
<p>Increased productivity of dairy cattle depends in part upon genetic changes brought about by select ion. Because of the long generation interval and low reproductive rate, genetic improvement in dairy cattle is slow. For this reason, the accuracy and effectiveness of selection of sires is of …
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The relative rapidity and economy of gains made in fattening steers on grass and in dry lot
Made available in DSpace on 2017-11-30T22:11:19Z (GMT). No. of bitstreams: 2 5081591.pdf: 5206451 bytes, checksum: 6067f7185ca64479f57e0e85b1e38967 (MD5) license.txt: 4813 bytes, checksum: 715c4321821a960fa1a1e91d2ac7ebce (MD5) Previous issue date: 1922
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Associations between gene variations and milk composition in New Zealand dairy cattle: A thesis submitted in fulfilment of the requirements for the Degree of Doctor of Philosophy at Lincoln University
… protein percentage are included in the National Breeding Objective. This is underpinned by the Breeding Worth (BW) index, which is used to estimate an animal’s genetic merit for production. In addition to quantity, the compositions of the milk fat and protein are also important quality …
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Identification and characterization of genetic markers and metabolic pathways controlling net feed efficiency in beef cattle.
… very few studies have been undertaken on beef cattle to identify genetic markers for NFE and to understand the molecular genetics of feed intake regulation and energy balance. Therefore, in an attempt to identify genes and metabolic pathways controlling feed efficiency in beef cattle, three …