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Dissertations / Theses on the topic 'COWs'

Author: Grafiati

Published: 4 June 2021

Last updated: 25 July 2025

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1

Clark, Gabriel Willis. "An Economic Evaluation of Winter-feeding Strategies for Lactating Organic Dairy Cows Utilizing Different Forage and Concentrate Feeding Systems in Maine." Fogler Library, University of Maine, 2009. http://www.library.umaine.edu/theses/pdf/ClarkGW2009.pdf.

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2

Chan, Christina. "Cash, cows, and conservation." Thesis, National Library of Canada = Bibliothèque nationale du Canada, 2000. http://www.collectionscanada.ca/obj/s4/f2/dsk1/tape4/PQDD_0032/MQ66937.pdf.

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3

Kinjet, Marc Philip. "Methane production from cows." Thesis, University of Reading, 2000. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.273714.

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4

Renfrow, Crystal. "Keeping Dairy Cows Cool." College of Agriculture and Life Sciences, University of Arizona (Tucson, AZ), 1995. http://hdl.handle.net/10150/622379.

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5

Jackson, D. A. "The voluntary intake of silage by individual dairy cows housed in groups." Thesis, University of Leeds, 1988. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.233176.

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6

Husted, James Ross. "Bacterial and fungal organisms in the vagina of normal cows and cows with vaginitis." Thesis, Texas A&M University, 2003. http://hdl.handle.net/1969.1/1310.

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Bacterial and fungal culturing was conducted on samples taken from the vaginal fornix of 106 cows, of which 42 had vaginitis and 64 had normal vaginas. The diagnosis of vaginitis and non-vaginitis samples was determined by histologic examination. Aerobic, anaerobic, and microaerophilic cultures were done. In addition, cultures were performed for Campylobacter sp., Ureaplasma sp., Mycoplasma sp., Tritrichomonas foetus, and fungi. All 106 samples contained mixed aerobic bacterial cultures. The more frequent aerobic isolates included Acinetobacter lwoffii, Arcanobacterium pyogenes, Escherichia co

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7

Hill, Scott L. "Serum and plasma metabolites and insemination timing associated with greater pregnancy risk in suckled beef cows subjected to artificial insemination programs." Diss., Kansas State University, 2016. http://hdl.handle.net/2097/34458.

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Doctor of Philosophy<br>Department of Animal Sciences and Industry<br>Jeffrey S. Stevenson<br>Four experiments were conducted in beef cows to determine factors that increased the probability of pregnancy per AI when cows are inseminated by appointment. Cows in all experiments were inseminated after a 7-d CO-Synch + CIDR program (100 μg GnRH [2 mL Factrel, Pfizer Animal Health, Whitehouse Station, NJ] 7 d before 25 mg PGF₂[subscript]α [d 0; 5 mL Lutalyse; Pfizer Animal Health]). Experiment 1 compared 1 vs. 2 inseminations and GnRH injection times at 60 and 75 h after the CO-Synch + CIDR program

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8

Hecheimi, Khaled Muhuddine. "Protein feeding for dairy cows." Thesis, Bangor University, 1994. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.239933.

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9

Alam, M. G. S. "Stress and reproduction in cows." Thesis, University of Liverpool, 1985. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.304744.

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10

Phipps, Kristen Renee. "'Till the Cows Come Home." The Ohio State University, 2021. http://rave.ohiolink.edu/etdc/view?acc_num=osu1618747544530061.

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11

Penasa, Mauro. "Crossbreeding effects in dairy cows." Doctoral thesis, Università degli studi di Padova, 2009. http://hdl.handle.net/11577/3426409.

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Crossbreeding is a common practice in poultry and swine breeding. Conversely, this mating system has not been widely adopted for breeding purposes in dairy cattle in temperate climates (except in New Zealand), mostly because of the superiority of Holsteins for milk yield, the economic relevance of this trait, the strong historical influence of purebred breeders and breed associations, and some biological aspects such as the low reproductive rate and the long generation interval of the cattle species. Recently, the interest in crossbreeding aspects has been growing among dairy producers, and th

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12

Turner, Matthew L. "The effect of bacterial pathogen-associated molecular patterns and metabolism on innate immunity in the bovine endometrium." Thesis, Swansea University, 2013. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.678484.

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13

Hedlund, Louise. "Personality and production in dairy cows." Thesis, Linköpings universitet, Zoologi, 2013. http://urn.kb.se/resolve?urn=urn:nbn:se:liu:diva-96450.

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Variation in animal personality, in other words, behavioural responses consistent within individuals over time and/or across contexts, is predicted to be related to life-history traits, such as growth rate and investment in reproduction. How this translates into relationships between personality and milk production in dairy cows is however scarcely investigated and previous studies are showing contradicting results. To further investigate this relationship, individual consistencies in behaviour were related to milk production in two breeds of dairy cows (Swedish red and white cattle, SRB, and

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14

Barker, Zoe Elizabeth. "Epidemiology of lameness in dairy cows." Thesis, University of Warwick, 2007. http://wrap.warwick.ac.uk/1117/.

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Four visits were made to 50 dairy farms in England and Wales between February 2003 and February 2004 and a further three visits to 42 of these farms between February 2005 and February 2006. At each visit the locomotion of all cows was scored (15,597 cows, 34,643 measures). Multivariable regression analyses were preformed to identify risk factors associated with increased lameness (poor locomotion). Factors associated with mean herd poor locomotion were dry cows kept in straw yards compared with cubicle houses, pregnant heifers kept with milking cows compared with dry cows in winter, passage wa

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15

Morris, Michael Jerome. "Stress and subfertility in dairy cows." Thesis, University of Liverpool, 2008. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.502545.

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In commercial dairy cattle farming, stressful disease conditions, such as high somatic cell count (SCC), poor body condition score (BCS) or lameness, are associated with subfertility. The objective of this thesis is to identify key areas in the reproductive cycle associated with each condition which contribute to this subfertility. Cows 30-80 days post partum from two commercial dairy farms were scored for SCC, BCS and lameness over a 5 week period prior to the implementation of an oestrous synchronization programme. Blood and milk sampling, trans-rectal ultrasonography and oestrus behaviour m

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16

Castillo, Alejandro R. "Improving nitrogen utilisation in dairy cows." Thesis, University of Reading, 1999. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.342460.

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17

Walker, Susan Lorene. "Stress and oestrus in dairy cows." Thesis, University of Liverpool, 2006. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.436261.

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18

Paiano, Renan Braga. "Effects of anemia on periparturient cows." Universidade de São Paulo, 2018. http://www.teses.usp.br/teses/disponiveis/10/10132/tde-31072018-144815/.

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The objectives of this study were to characterize the hematological and productive pattern during the peripartum in cows with and without anemia, as well as to evaluate the erythrogram in animals that presented metritis puerperal acute (MPA), lameness, acetonemia, increased non-esterified fatty acids (NEFA) and cows with different categorization of body condition score (BCS). In study 1, 50 Holstein cows (29 multiparous and 21 primiparous) were used. Blood samples and physical examination were performed at 13 different times: 18 ± 3, 12 ± 2, 5 ± 1, and 2 ± 1 before calvi

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19

Wilkes, Crafton O. "Impact of relocation on dairy cows." Thesis, Virginia Tech, 2005. http://hdl.handle.net/10919/34733.

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Several indicators of animal welfare were measured to determine the impact of relocation on lactating dairy cows. In experiment one, locomotion was scored on a 4-point scale where 1 = normal and 4 = lame. Cleanliness was scored on a 4-point scale where 1 = little or no manure visible and 4 = heavy plaques of manure on 3 body regions: udder, lower leg, and flank/upper leg. In experiment two, milking parlor behaviors observed were cow reactivity (REACT), latency to enter the parlor (LAT), and plasma cortisol (CORT). REACT was evaluated on a numeric scale (0 = ideal milker to 3 = steps and ki

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20

Gott, Paige Nicole. "Endotoxin Tolerance in Lactating Dairy Cows." The Ohio State University, 2011. http://rave.ohiolink.edu/etdc/view?acc_num=osu1322613488.

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21

McCoy, Jan. "Apache Cows Get the Once-Over." College of Agriculture, University of Arizona (Tucson, AZ), 1990. http://hdl.handle.net/10150/295617.

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22

Geldart, Jacqueline R. "Determining forage intake potential of dairy cows." Thesis, National Library of Canada = Bibliothèque nationale du Canada, 1999. http://www.collectionscanada.ca/obj/s4/f2/dsk2/ftp01/MQ49355.pdf.

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23

Lindström, Tina. "Feeding behaviour in dairy cows : motivational aspects /." Uppsala : Swedish Univ. of Agricultural Sciences (Sveriges lantbruksuniv.), 2000. http://epsilon.slu.se/avh/2000/91-576-5761-0.pdf.

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24

Barrientos, Araneda Alejandra Karina. "Hock injuries in freestall housed dairy cows." Thesis, University of British Columbia, 2012. http://hdl.handle.net/2429/43780.

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The objective of this thesis was to investigate housing and management risk factors associated with the prevalence of hock injuries in freestall herds (n = 76) in two areas of intensive dairy production, Northeastern US (NE-US) and California (CA). One group of high-production multiparous cows (n = 38) was monitored for hock injuries on each farm and data on management, facility and stall design were collected. Risk factors associated with the overall proportion of cows having injuries or severe injuries at the univariable level were submitted to multivariable general linear models. In NE-US,

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25

Vargas, Bello Pérez Einar. "Performance of dairy cows fed soybean silage." Thesis, McGill University, 2007. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=18417.

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PERFORMANCE OF DAIRY COWS FED SOYBEAN SILAGE The objective of this research was to determine the feeding values of forage soybean (cv. Kodiak, full pod stage) silage to lactating dairy cows. Two diets with a 50:50 forage:concentrate ratio were formulated to meet nutrient requirements of dairy cows in early lactation. Soybean silage (SS) or a fourth cut alfalfa silage (AS) comprised 72% of the forage in each diet, with corn silage comprising the remaining 28%. Twenty Holsteins cows in early lactation were used in a Switchback design to determine the effects of dietary treatments on milk yield

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26

Masson, Lorna L. "On-line metabolic profiling in dairy cows." Thesis, University of Nottingham, 2004. http://eprints.nottingham.ac.uk/28412/.

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Automatic sampling and analysis of milk composition for on-line metabolic profiling has been proposed as a means of monitoring individual cows to detect and correct problems in nutritional management. Acetone, urea, fat, protein and citrate in milk were investigated independently and jointly as potential indicators for monitoring the dairy cow. A series of experiments and milk analysis were conducted to investigate sources of variation within and between cows, nutritional effects on milk composition and whether dietary changes could be detected through changes in milk composition. Novel method

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27

Proudfoot, Kathryn Louise. "Understanding the behaviour of transition dairy cows." Thesis, University of British Columbia, 2013. http://hdl.handle.net/2429/45103.

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Many concerns over the welfare of dairy cattle occur during the time around parturition. As cows transition from a pregnant to a lactating state, they are at high risk of disease and other painful conditions. In most intensive housing systems, these ‘transition’ cows are also kept in environments designed for the ease of management, with little consideration given to the expression of natural behaviours. This thesis addresses two main themes that are currently missing from the transition cow literature: 1) using knowledge of behaviour to improve management and housing practices, and 2) using b

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28

Hattan, Andrew Joseph. "Energy utilisation in high yielding dairy cows." Thesis, University of Reading, 2003. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.288678.

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29

Calitz, Tanja. "Melamine excretion pathways in lactating dairy cows." Thesis, Stellenbosch : Stellenbosch University, 2013. http://hdl.handle.net/10019.1/80156.

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Thesis (PhD)--Stellenbosch University, 2013.<br>ENGLISH ABSTRACT: In this study, five trials were conducted to examine in vitro and in vivo degradation, excretion and absorption parameters of melamine (MEL) in dairy cows that have not been studied before or where limited information is available. The first two trials were in vitro studies conducted to determine the extent of MEL degradation in rumen liquor and the effects of MEL on ruminal ammonia (NH3) and volatile fatty acid (VFA) concentrations. For both trials, rumen liquor was collected from ruminally cannulated lactating Holstein cows. F

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30

Yuan, Kai. "Metabolic inflammation and immunomodulation in dairy cows." Diss., Kansas State University, 2014. http://hdl.handle.net/2097/17294.

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Doctor of Philosophy<br>Department of Animal Sciences and Industry<br>Barry J. Bradford<br>The transition period in dairy cows is characterized by dramatic increases in nutrient requirements for lactation and substantial metabolic stress. The disturbed metabolic balance, coupled with suppressed immune function, contributes to markedly elevated incidence of health disorders. Several lines of evidence suggest that increased inflammation is common during the transition period. Unlike the classical inflammation associated with acute infection, the postpartum inflammatory state is low-grade and oft

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31

Sauls, Julie A. "Increasing estrus expression in lactating dairy cows." Thesis, Kansas State University, 2016. http://hdl.handle.net/2097/32533.

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Master of Science<br>Animal Sciences and Industry<br>Jeffrey S. Stevenson<br>Using an activity monitoring system (AMS) equipped with an accelerometer, 2 experiments were conducted to test the hypotheses that: (1) altering progesterone before inducing luteolysis or (2) exposing cows to estradiol cypionate (ECP) or testosterone propionate (TP) after luteolysis would increase occurrence and intensity of estrus. In experiment 1, cows (n = 154) were fitted with an AMS collar and a pressure-sensitive, rump-mounted device (HW) and assigned to 3 treatments: 1) CL only; 2) no CL + progesterone insert (

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32

Tomita, Grant Matsuo. "Immunization of dairy cows against Coliform Mastitis /." The Ohio State University, 1994. http://rave.ohiolink.edu/etdc/view?acc_num=osu1487861396024528.

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33

Dinh, Sarah. "Urea-N recycling in lactating dairy cows." College Park, Md.: University of Maryland, 2007. http://hdl.handle.net/1903/7815.

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Thesis (Ph. D.) -- University of Maryland, College Park, 2007.<br>Thesis research directed by: Dept. of Animal and Avian Sciences. Title from t.p. of PDF. Includes bibliographical references. Published by UMI Dissertation Services, Ann Arbor, Mich. Also available in paper.

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34

Casey, Susan C. "Product development and marketing of cull cows /." abstract and full text PDF (UNR users only), 2008. http://0-gateway.proquest.com.innopac.library.unr.edu/openurl?url_ver=Z39.88-2004&rft_val_fmt=info:ofi/fmt:kev:mtx:dissertation&res_dat=xri:pqdiss&rft_dat=xri:pqdiss:1461531.

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Thesis (M.S.)--University of Nevada, Reno, 2008.<br>"December, 2008." Includes bibliographical references (leaves 27-31). Library also has microfilm. Ann Arbor, Mich. : ProQuest Information and Learning Company, [2009]. 1 microfilm reel ; 35 mm. Online version available on the World Wide Web.

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35

Aquino, Haley Lynne. "Lameness and locomotion scoring of dairy cows/." Click here to view, 2009. http://digitalcommons.calpoly.edu/dscisp/18.

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Thesis (B.S.)--California Polytechnic State University, 2009.<br>Project advisor: Stan Henderson. Title from PDF title page; viewed on Jan. 21, 2010. Includes bibliographical references. Also available on microfiche.

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36

Wellnitz, Olga. "Inhibition of milk ejection in dairy cows /." [S.l.] : [s.n.], 1997. http://www.stub.unibe.ch/html/haupt/datenbanken/diss/bestell.html.

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37

Fish, Ronald Dean. "Estrus Synchronization of Beef and Dairy Cows." Diss., The University of Arizona, 2011. http://hdl.handle.net/10150/217055.

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An estrus synchronization trial was conducted to determine the efficacy of adding an injection of gonadotropin releasing hormone (GnRH) at initiation of the controlled intravaginal drug releasing device (CIDR®) progesterone synchronization protocol in heifers. Nulliparous (n=121) beef heifers were randomly assigned to one of two treatment groups. All heifers received a CIDR® implant at the initiation of the breeding season. Half of the heifers (Select Synch) received an injection of GnRH. Heifers in the Select Synch treatment group had a lower numerical response (76.7% versus 88.3%) to treatme

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38

Ali, Mohammad. "Bovine pregnancy-associated glycoprotein in biological fluids." Thesis, University of Aberdeen, 1999. http://digitool.abdn.ac.uk/R?func=search-advanced-go&find_code1=WSN&request1=AAIU118324.

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The objectives of the current study were: 1) to examine serum bPAG concentration during pregnancy, and in the post-partum period in relation to the overall nutritional and metabolic status and post-partum anoestrous period; 2) to investigate bPAG decay models for postulating distribution and metabolism of bPAG in the blood circulation using half-life (t1/2) and to compare the t1/2 values between breeds and nutritional treatments for the clearance of bPAG; 3) to examine the suitability of the radioimmunoassay (RIA) for measuring bPAG in urine, saliva and milk, to investigate temporal relationsh

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39

Kask, Kalle. "Postpartum reproductive performance in dairy cows under different managemental systems and in cows with induced parturitions : a clinical, microbiological, morphological, hormonal and granulocyte function study /." Uppsala : Swedish Univ. of Agricultural Sciences (Sveriges lantbruksuniv.), 1999. http://epsilon.slu.se/avh/1999/91-576-5443-3.pdf.

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40

Engstrand, Ulla. "Aspects of change-over trials with application on dairy cows /." Uppsala : Swedish Univ. of Agricultural Sciences (Sveriges lantbruksuniv.), 2000. http://epsilon.slu.se/avh/2000/91-576-5765-3.pdf.

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41

Man, Ngo Van. "Better use of local forages for dairy cattle in Vietnam : improving grasses, rice straw and protein rich forages /." Uppsala : Swedish Univ. of Agricultural Sciences (Sveriges lantbruksuniv.), 2001. http://epsilon.slu.se/avh/2001/91-576-5817-X.pdf.

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42

Sanh, Mai Van. "Effects of feeding level and forage/concentrate ratio on milk production and performance of crossbred lactating cows /." Uppsala : Swedish Univ. of Agricultural Sciences (Sveriges lantbruksuniv.), 2001. http://epsilon.slu.se/avh/2001/91-576-5819-6.pdf.

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43

Hultgren, Jan. "Observational and experimental studies of the influence of housing factors on the behaviour and health of dairy cows /." Uppsala : Swedish Univ. of Agricultural Sciences (Sveriges lantbruksuniv.), 2001. http://epsilon.slu.se/v104.pdf.

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44

Concha, Bascuñan Carlos. "Activity of leukocytes in bovine mammary secretion and their responsiveness to mitogens and Ginseng /." Uppsala : Swedish Univ. of Agricultural Sciences (Sveriges lantbruksuniv.), 2001. http://epsilon.slu.se/avh/2001/91-576-5937-0.pdf.

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45

Ambushe, AA, RI McCrindle, and CME McCrindle. "Speciation of chromium in cow’s milk by solid-phase extraction/dynamic reaction cell inductively coupled plasma mass spectrometry (DRC-ICP-MS)." The Royal Society of Chemistry, 2009. http://encore.tut.ac.za/iii/cpro/DigitalItemViewPage.external?sp=1001492.

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Chromium can act either as an essential micronutrient or a chemical carcinogen, depending on its oxidation state. Of the two most stable chromium oxidation states, Cr(VI) is a known carcinogen, while Cr(III) is an essential element. Determination of total Cr cannot therefore be used to evaluate food safety of dairy products, as speciation is required for accurate assessment of potential toxicity. In this study, total Cr was determined by DRC-ICP-MS after mineralisation of freeze-dried milk samples. Chromabond NH2 ion-exchange columns were used to separate Cr(VI) from Cr(III). During the separa

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46

Weigel, Daniel J. "Impact of different strategies and levels of preferential treatment on different methods of bull dam selection." Thesis, Virginia Tech, 1991. http://hdl.handle.net/10919/41590.

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Three milk, fat yield and final score type records were simulated for each cow in 20 herds of 200 cows over 13 years. At completion of the simulation, cows were ranked by different selection methods and the top 2% were chosen to be bull dams. Preferential treatment was simulated by increasing milk and fat yields by 8, 16, 32, and 48% in separate copies of the simulation. Preferential treatment was given to a limited number of cows in copies of the original herds based on 8 strategies. Cows were chosen to receive preferential treatment for 2nd and 3rd records based on phenotypic records and ETA

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47

Loberg, Jenny M. "Behaviour of foster cows and calves in dairy production : acceptance of calves, cow-calf interactions and weaning /." Uppsala : Dept. of Animal Environment and Health, Swedish University of Agricultural Sciences, 2007. http://epsilon.slu.se/2007122.pdf.

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48

Rees, Anne [Verfasser]. "Evaluation of udder firmness and fecal cortisol metabolites as cow-side parameters in dairy cows / Anne Rees." Berlin : Freie Universität Berlin, 2017. http://d-nb.info/1129174441/34.

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49

Weatherly, Maegan E. "ALGAE OR YEAST SUPPLEMENTATION FOR LACTATING DAIRY COWS." UKnowledge, 2015. http://uknowledge.uky.edu/animalsci_etds/47.

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The objective of the first study was to quantify the effects of feeding Schizochytrium sp. microalgae (SP-1, Alltech, Inc., Nicholasville, KY) on milk fat and DHA content. Eight cows were fed: 0, 100, 300, or 600 g of algae per day. Fat percentage was greater (P < 0.05) for cows on treatments 0 g and 100 g than for cows on treatments 300 g and 600 g (P < 0.05). Docosahexaenoic acid in milk was greater for cows on treatment 300 and 600 than for cows on treatment 0 and 100 (P < 0.05). The objective of the second study was to assess yeast supplementation effects on high and low forage dairy co

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50

Kirkland, Richard Mervyn. "Energy partitioning and utilisation in lactating dairy cows." Thesis, Queen's University Belfast, 2000. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.326343.

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