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Dissertations / Theses on the topic 'Beef cows'

Author: Grafiati

Published: 4 June 2021

Last updated: 1 February 2022

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1

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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2

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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3

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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4

Kincheloe, Janna Jo. "Variation in supplement intake by grazing beef cows." Thesis, Montana State University, 2004. http://etd.lib.montana.edu/etd/2004/kincheloe/KincheloeJ04.pdf.

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5

Horsley, Donald Shane. "Determining the Nutritional Status of Mature Beef Cows." Thesis, Virginia Tech, 2002. http://hdl.handle.net/10919/31211.

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Improved prediction of forage quality and cow performance may enhance the nutritional management of beef cows. In two 12 mo trials, mature beef cows (n=136) grazing tall fescue pastures were used to compare estimates of forage quality and animal performance. Forage quality was estimated by proximate analysis of forage samples (FOR) or by near infrared reflectance spectroscopy of fecal samples (FNIR). Nutritional Balance Analyzer (NutBal), NutBalPro and 1996 NRC Nutrient Requirements of Beef Cattle (NRC) programs were used to predict animal performance. The objectives were to compare FOR an

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6

Curtis, LeAnn Elizabeth. "Impact of grazing stockpiled tall fescue of lactating beef cows." Diss., Columbia, Mo. : University of Missouri-Columbia, 2006. http://hdl.handle.net/10355/4574.

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Thesis (M.S.)--University of Missouri-Columbia, 2006.<br>The entire dissertation/thesis text is included in the research.pdf file; the official abstract appears in the short.pdf file (which also appears in the research.pdf); a non-technical general description, or public abstract, appears in the public.pdf file. Title from title screen of research.pdf file (viewed on April 20, 2009) Includes bibliographical references.

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7

Nelson, John Stephen. "Fixed-time insemination of porcine luteinizing hormone-treated superovulated beef cows and the resynchronization of beef cows for fixed-time embryo transfer." [College Station, Tex. : Texas A&M University, 2008. http://hdl.handle.net/1969.1/ETD-TAMU-3239.

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8

Gross, Kathy Lynn. "Nutritional status of beef cows grazing reclaimed strip mined pastures." Thesis, Virginia Polytechnic Institute and State University, 1985. http://hdl.handle.net/10919/90930.

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A series of four trials over the grazing season were conducted to evaluate the nutritional status of beef cows grazing reclaimed strip-mined pastures in southwestern, Virginia. Blood samples, esophageal fistula forage samples and hand plucked forage samples were taken in each trial. An external marker, Ytterbium, and an internal marker, indigestible neutral detergent fiber (INDF) were used to estimate organic matter intake, fecal output and digestibility. In addition to samples taken during the trials, blood samples and hand plucked forage samples were taken monthly for 11 mo prior to the tria

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9

Oliver, Katherine Rene. "Consumption of Endophyte Infected Fescue During Gestation in Beef Cows." Thesis, Virginia Tech, 2016. http://hdl.handle.net/10919/81478.

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Tall fescue is a widely grown, cool season grass prevalent in the eastern United States that is known for its resistance to abiotic and biotic stresses. A main reason for tall fescue's resistance to these stresses is attributed to the presence of a fungal endophyte. Unfortunately, this endophyte also adversely affects cattle production. Cows consuming the ergot alkaloids produced by these endophytes can exhibit decreased feed intake, growth performance, organ vasoconstriction, and increased rectal temperature. This work is interested in examining how endophyte toxin exposure impacts pregnanc

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10

Bader, Jonathan F. "Management practices to optimize reproductive efficiency in primiparous and multiparous suckled beef cows /." free to MU campus, to others for purchase, 2003. http://wwwlib.umi.com/cr/mo/fullcit?p1418002.

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11

Marquezini, Guilherme H. L. "The effect of human chorionic gonadotropin on fertility of beef cows." [Gainesville, Fla.] : University of Florida, 2009. http://purl.fcla.edu/fcla/etd/UFE0041296.

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12

Tanner, Amelia R. "Winter Feeding Strategies: Implications of Corn Supplementation on Gestating Beef Cows." Thesis, North Dakota State University, 2017. https://hdl.handle.net/10365/28368.

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Overwintered, gestating beef cows fed low-quality forage are at risk of nutrient restriction which can lead to compromised growth and poor carcass quality in their offspring. In many species, poor maternal nutrition also results in reduced uteroplacental hemodynamics and fetal growth. To better understand how different nutritional paradigms influence the beef cow, our lab has examined the impacts of nutrient restriction and diet composition on uterine hemodynamics. Previous research suggests that dietary intake or protein supplementation alone does not increase uterine blood flow. The current

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13

Pacheco, Leopoldo Arturo IV. "Nutritional and range management practices for breeding beef females." Diss., Kansas State University, 2013. http://hdl.handle.net/2097/16806.

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Doctor of Philosophy<br>Department of Animal Sciences and Industry<br>KC Olson<br>The objective of this series of studies was to develop and improve methods of production in cow/calf operations of the Great Plains. Ultrasound measures of longissimus muscle depth (LMD) and intramuscular fat (IMF) of Angus × heifers were used to predict lifetime cow productivity. IMF and LMD were categorized into high, medium, and low groups (IMFG and LMDG, respectively). Cows in the high and medium LMDG had greater (P < 0.05) pregnancy rates than cows in the low LMDG. Calf BW at weaning increased (P < 0.05) as

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14

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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15

Candler, Jason B. "Effect of concentrations of progesterone on follicular development and fertility in beef cows." Morgantown, W. Va. : [West Virginia University Libraries], 2001. http://etd.wvu.edu/templates/showETD.cfm?recnum=2031.

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Thesis (M.S.)--West Virginia University, 2001.<br>Title from document title page. Document formatted into pages; contains vi, 44 p. : ill. Vita. Includes abstract. Includes bibliographical references (p. 35-43).

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16

Odhiambo, John F. "Management of the suckled post partum beef cows pasture based weaning system /." Morgantown, W. Va. : [West Virginia University Libraries], 2005. https://eidr.wvu.edu/etd/documentdata.eTD?documentid=4315.

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Thesis (M.S.)--West Virginia University, 2005.<br>Title from document title page. Document formatted into pages; contains ix, 64 p. : ill. (some col.). Includes abstract. Includes bibliographical references (p. 49-60).

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17

Preedy, Garrett William. "Herbivory habits of beef cows grazing native range infested by sericea lespedeza." Thesis, Kansas State University, 2013. http://hdl.handle.net/2097/15634.

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Master of Science<br>Department of Animal Sciences and Industry<br>KC Olson<br>Our objective was to determine the effects of supplemental corn steep liquor (CSL) on voluntary selection of sericea lespedeza (SL) by beef cows grazing native tallgrass range. Dietary botanical composition of cows (n = 145; initial BW = 579 ± 91 kg) was evaluated during a 150-d grazing period (5/1 to 10/1). Native pastures (n = 9; 50 ± 17 ha) infested by SL (average SL biomass = 37% of total forage biomass) were assigned randomly to 1 of 2 treatments: grazing by unsupplemented cows or grazing by cows supplemented w

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18

Orsmond, Michelle. "Influence of phosphorus supplementation on growth and reproductive characteristics of beef cows in the semi-arid bushveld of South Africa." Pretoria : [s.n.], 2007. http://upetd.up.ac.za/thesis/available/etd-08202008-123226.

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19

Sinclair, Kevin D. "Metabolism in cattle and regulation of anterior pituitary hormone release." Thesis, University of Aberdeen, 1996. http://digitool.abdn.ac.uk/R?func=search-advanced-go&find_code1=WSN&request1=AAIU079035.

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Experiments were designed to assess the effects of energy and protein intake on metabolic function and reproductive efficiency in single and twin suckling beef cows and heifers. A role was proposed for endogenous opioid peptides in mediating the effects of photoperiod, suckling and nutrition on anterior pituitary hormone release, and tested with respect to nutrition. The first two experiments were designed to quantify the effects of pre- and post-partum energy and protein intake, on milk yield and composition, body tissue mobilisation, the post-partum anoestrous interval, and subsequent concep

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20

Wilson, Dallas James Patterson David J. "Comparison of controlled internal drug release (CIDR)-based protocols to synchronize estrus and facilitate artificial insemination (AI) in postpartum beef cows." Diss., Columbia, Mo. : University of Missouri--Columbia, 2008. http://hdl.handle.net/10355/5687.

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The entire thesis text is included in the research.pdf file; the official abstract appears in the short.pdf file; a non-technical public abstract appears in the public.pdf file. Title from PDF of title page (University of Missouri--Columbia, viewed on October 6, 2009) Thesis advisor: Dr. David J. Patterson, Includes bibliographical references.

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21

Reyaz, Arshi. "Influence of Maternal Nutrient Intake on Placental Vascular Function in Pregnant Beef Cows." Thesis, North Dakota State University, 2014. https://hdl.handle.net/10365/26993.

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We hypothesized that global maternal nutrient restriction during early and mid-gestation followed by realimentation in pregnant beef cows would alter placental arterial vascular function. We tested changes in placental caruncular (CAR) and cotyledonary (COT) arterial sensitivity to bradykinin (BK), a potent vasodilator. Cows were randomly assigned to be nutrient restricted for 55 or 110 during early to mid pregnancy. On d 85, 140, and 254 cows were euthanized and CAR and COT arteries were isolated. Maternal nutrient restriction during early and mid-gestation allowed for placental compensation

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22

Mordhorst, Bethany Rae. "Influence of Maternal Nutrient Intake on Placental Vascular Function in Pregnant Beef Cows." Thesis, North Dakota State University, 2014. https://hdl.handle.net/10365/27383.

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Two experiments investigating impacts of maternal nutrition in beef cows were conducted; 1) to test the impact of duration of global nutrient restriction and subsequent realimentation throughout gestation on placentome capillary development; and 2) to test the response of protein supplementation on blood flow to the uterus and mammary gland in late gestation. In experiment one, realimentation following varying periods of nutrient restriction had minor alterations in angiogenic factor mRNA expression of as well as vascularity in the placentome. In experiment two, mammary gland blood flow was no

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23

Perry, George A. "Induction of cycling status and effect of follicle size on fertility in postpartum beef cows /." free to MU campus, to others for purchase, 2003. http://wwwlib.umi.com/cr/mo/fullcit?p3091956.

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24

Wilkinson, Jarrod Robert Charles. "The biostimulatory effect of bulls on postpartum follicular wave development in postpartum, anestrous, suckled beef cows." Thesis, Montana State University, 2009. http://etd.lib.montana.edu/etd/2009/wilkinson/WilkinsonJ0809.pdf.

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The objective of this experiment was to determine if bull exposure influences follicular wave dynamics in primiparous, postpartum, anestrous, suckled, beef cows exposed to bulls. In Experiment 1, cows were exposed (continuously 24 h/d), (EB; n = 5) to bulls or not exposed to bulls (NE; n = 5) throughout the experimental period. In Experiment 2, cows were exposed to bulls for either 12 h, (EB12; n = 15), 6 h, (EB6; n =14) or not exposed to bulls (NE; n = 10) from the start to the end of the experimental period. In Experiments 1 and 2, cows were 67 d Â± 3.8 (mean Â± SE)

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25

Islam, Md Nurul. "The effects of pre-calving nutrition on the performance of single and twin pregnant beef cows and their calves." Thesis, University of Aberdeen, 1988. http://digitool.abdn.ac.uk/R?func=search-advanced-go&find_code1=WSN&request1=AAIU010517.

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Three experiments were carried out to assess the energy and protein requirments of single and twin-bearing beef cows during the last three months of pregnancy and also to observe the effects of pregnancy nutrition on the subsequent lactational performance of cows and calves. A wide range of energy level was applied to single and twin-bearing cows. As assessed from body weight change, calf birthweight, milk yield, calf growth rate and blood parameters, it was found that there was no benefit in giving high levels of dietary energy to cows during pregnancy. It was concluded that feeding 50 and 70

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26

Graham, Patrick M. "An optimal replacement policy for beef cows: a state model under conditions of uncertainty." Thesis, Montana State University, 1994. http://etd.lib.montana.edu/etd/1994/graham/GrahamP1994.pdf.

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Cattle ranchers are periodically faced with the decision of whether or not to cull/replace a brood cow. Assets such as beef cows are subject to stochastic elements that affect the cull/replacement decision. Stochastic elements include events such as death, infertility, and the inability to meet specific performance standards. Observations suggest that many Montana ranchers use a period-by-period cull/replacement decision-making strategy. However, varying management practices, stochastic elements, and the lengthy biological process associated with cattle production limit the validity of a singl

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27

Visagie, Pieter Cornelis. "Effect of the production environment on the production efficiency of Bonsmara cows in South Africa." Diss., University of Pretoria, 2012. http://hdl.handle.net/2263/24963.

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The production environment is known to have a large influence on extensively managed beef cows. A better understanding of the relationship between the beef cow and her environment should be useful in the pursuit of improving beef cow efficiency. The influence of the production environment on the efficiency of extensively managed Bonsmara cows was investigated through a series of research objectives. It was found that VEGMAP’s bioregion classification system can be used to describe the South African beef production regions. The environmental characteristics with the potential to influence beef

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28

Bridges, Phillip J. "Association of late embryonic mortality in beef cows with concentrations of estradiol-17[beta] and prostagladin F₂[alpha]." Morgantown, W. Va. : [West Virginia University Libraries], 1999. http://etd.wvu.edu/templates/showETD.cfm?recnum=1074.

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29

Stutts, Kyle Jeffrey. "Synchronization of follicular wave emergence, luteal regression, and ovulation for fixed-time artificial insemination in beef cows and heifers." Texas A&M University, 2005. http://hdl.handle.net/1969.1/4208.

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Two experiments tested the efficacy of gonadotropin-releasing hormone (GnRH) or estradiol cypionate (ECP) administration in combination with controlled internal drug release (CIDR) inserts on pregnancy rate to fixed-time artificial insemination (FTAI) in beef heifers. In the first experiment, heifers in the two ECP groups received ECP in conjunction with the CIDR insert. The CIDR insert was removed and PGF was administered on either d 7 or 9. Heifers received ECP 24 h after CIDR removal and were inseminated 30 h after ECP. Heifers in the two GnRH groups received GnRH in conjunction with the CI

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30

Zapien, Antonio. "Influence of dietary energy restriction on postpartum LH and GH secretory patterns in beef cows." Diss., The University of Arizona, 1992. http://hdl.handle.net/10150/186008.

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Postpartum LH and GH secretory patterns were evaluated with mature Brangus cows group fed either 50%M (n = 8) or 100%M (n = 7) NRC maintenance energy requirements starting two months prepartum and continuing for three months postpartum. Feed level was adjusted at 14 day intervals. Weights of cows and (or) calves were taken every 14 days before and after calving. Sequential blood samples were taken every 15 min for 8 h at biweekly intervals starting 14 days postpartum and continuing until 100 days. Serum LH and GH were determined by a validated double antibody RIA. A peak-detection algorithm wa

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31

Hennessy, D. "Manipulation of grass supply to meet the feed demand of beef cattle and dairy cows." Thesis, Queen's University Belfast, 2005. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.426726.

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32

Quintans, Graciela. "Opioid peptides and the regulation of gonadotrophin release in post-partum beef cows and ewes." Thesis, University of Aberdeen, 1998. http://digitool.abdn.ac.uk/R?func=search-advanced-go&find_code1=WSN&request1=AAIU100680.

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Nutrition and suckling are known to be the most important factors affecting the length of the anovulatory post-partum period in beef cows. In sheep, nutrition and suckling are also important factors when ewes lamb during the season breeding, in more intensive production systems. A number of neurotransmitters have been proposed to be implicated in the activation of the GnRH pulse generator, which controls LH release. The aim of the present study was to investigate the role of the opioid peptides in the mediation of the effects of nutrition and suckling in both cows and ewes, during the post-par

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33

Murrieta, Charles M. "Lipogenic enzyme mRNA of milk and adipose tissue of lactating beef cows and their calves influence of day of lactation, maternal dietary fat supplementation, and body condition score /." Laramie, Wyo. : University of Wyoming, 2007. http://proquest.umi.com/pqdweb?did=1338900371&sid=1&Fmt=2&clientId=18949&RQT=309&VName=PQD.

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34

Olsen, Jesse Riley. "Changes in temporal leptin concentrations and other metabolic factors in primiparous, postpartum, anestrous, suckled beef cows exposed to bulls." Thesis, Montana State University, 2009. http://etd.lib.montana.edu/etd/2009/olsen/OlsenJ0809.pdf.

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Exposing cows to bulls or excretory products of bulls stimulates resumption of ovarian cycling activity in postpartum, suckled, anestrous cows. This biostimulatory effect may be mediated by pheromones produced by bulls that stimulate physiological changes in metabolic regulation of the hypothalamic-pituitary-ovarian (HPO) axis of cows. In Experiment 1, the hypotheses tested were that concentrations of glucose, NEFA, thyroxine (T4), tri-iodothyronine (T3), and T3:T4 ratios do not differ between cows exposed to bulls or steers. The biostimulatory effect of bulls was associated with lower mean co

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35

Gasser, Chad Lamar. "Ovarian and endocrine dynamics associated with sexual maturation in beef heifers and the influence of diet, weaning age, and other factors during early reproductive development." Connect to this title online, 2005. http://rave.ohiolink.edu/etdc/view?acc%5Fnum=osu1122295880.

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Thesis (Ph. D.)--Ohio State University, 2005.<br>Title from first page of PDF file. Document formatted into pages; contains xvii, 181 p. : ill. Includes bibliographical references (p. 159-181). Available online via OhioLINK's ETD Center

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36

Wright, Martha A. "Effect of feeding high levels of broiler litter on mineral metabolism and health of beef cows." Thesis, This resource online, 1996. http://scholar.lib.vt.edu/theses/available/etd-08222008-063130/.

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37

Kennedy, Victoria Carolyn. "Supplementation of Corn Dried Distiller's Grains Plus Solubles to Gestating Beef Cows Fed Low-Quality Forage." Thesis, North Dakota State University, 2015. https://hdl.handle.net/10365/27877.

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To investigate the effects of corn dried distiller?s grains plus solubles (DDGS) supplementation to cows during late gestation, 27 multiparous beef cows were divided randomly into 2 treatment groups (CON; n = 15; SUP = DDGS at 0.3% of BW; n = 12). Supplemented cows gained BW (P < 0.01) while CON cows tended to lose BW (P = 0.06). A main effect of treatment (P = 0.02) and day (P < 0.01) was observed for total uterine blood flow (BF). Calves born to SUP cows tended to be heavier than calves born to CON cows (P = 0.06). Both groups gained (P < 0.01) BW with advancing lactation. Supplementing DDGS

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Langford, Taylor Andrew. "Effects of fescue cultivar on performance of beef cows grazed on summer stockpiled tall fescue pastures." Thesis, Virginia Tech, 2020. http://hdl.handle.net/10919/98813.

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This 2-yr experiment evaluated productivity of wild-type, endophyte-infected tall fescue (E+) and novel endophyte-infected tall fescue (NE) summer stockpiled (SS) pastures and the performance of fall-calving beef cow/calf pairs stocked on each cultivar. Fescue cultivars used were KY-31 and MaxQ for E+ and NE treatments, respectively. Pregnant Simmental x Angus cows (128 total, 64 each yr) were stratified by BW, BCS, and expected calving date and then allotted to 1 of 10 pasture groups within each yr (20 groups total, 10 per treatment). Forage growth was stockpiled from April until the initiati

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Lake, Scott L. "Postpartum dietary lipid supplmementation [sic] for beef cows managed to achieve two different body condition scores at parturition." Laramie, Wyo. : University of Wyoming, 2005. http://proquest.umi.com/pqdweb?did=1095427571&sid=2&Fmt=2&clientId=18949&RQT=309&VName=PQD.

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Dyer, Ted. "The Relationship Between Linear Measurements & Subjective Placings in Elite Angus Cattle." TopSCHOLAR®, 1985. https://digitalcommons.wku.edu/theses/2277.

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The cattle shown from 1981 to 1984 at the American Angus Breeders' Futurity were studied to determine the relationship between linear measurements and the judge's subjective placings. Linear measurements taken prior to the showing included wither height, hip height, and body length for both bulls and heifers. In addition body weight and scrotal circumference were recorded for bulls. A total of 624 cattle were studied-- 407 heifers and 217 bulls. The cattle were divided into five groups by age and sex to analyze the annual difference in means and standard deviations for all recorded measurement

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Plank, Johanna E. "The Effect of Weaning on Pasture Consumption by Beef Cows in a Four Week Period Following Weaning." Connect to resource, 2008. http://hdl.handle.net/1811/32127.

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42

Martins, Leandro Soares. "Effects of supplementation on performance and nutritional and metabolic aspects of beef cows and calves at pasture." Universidade Federal de Viçosa, 2017. http://www.locus.ufv.br/handle/123456789/10414.

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Submitted by Marco Antônio de Ramos Chagas (mchagas@ufv.br) on 2017-05-25T11:34:20Z No. of bitstreams: 1 texto completo.pdf: 962866 bytes, checksum: b6cdc68fb4067947101c8c4cba12ffa8 (MD5)<br>Made available in DSpace on 2017-05-25T11:34:20Z (GMT). No. of bitstreams: 1 texto completo.pdf: 962866 bytes, checksum: b6cdc68fb4067947101c8c4cba12ffa8 (MD5) Previous issue date: 2017-02-22<br>Conselho Nacional de Desenvolvimento Científico e Tecnológico<br>Para a composição desta tese foram elaborados três artigos científicos baseados em estudos realizados com matrizes da raça Nelore e suas respec

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Moura, Felipe Henrique de. "Effects of energy-protein supplementation frequency on performance of primiparous grazing beef cows during pre and postpartum." Universidade Federal de Viçosa, 2018. http://www.locus.ufv.br/handle/123456789/20702.

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Submitted by MARCOS LEANDRO TEIXEIRA DE OLIVEIRA (marcosteixeira@ufv.br) on 2018-07-23T18:47:06Z No. of bitstreams: 1 texto completo.pdf: 794104 bytes, checksum: 8c35b7cff540a6a80df86a7a07ed89fe (MD5)<br>Made available in DSpace on 2018-07-23T18:47:06Z (GMT). No. of bitstreams: 1 texto completo.pdf: 794104 bytes, checksum: 8c35b7cff540a6a80df86a7a07ed89fe (MD5) Previous issue date: 2018-02-21<br>Coordenação de Aperfeiçoamento de Pessoal de Nível Superior<br>O presente estudo foi realizado para avaliar os efeitos da suplementação proteico- enegética e frequência de suplementação durante o

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Martins, Francisca da Costa Freitas. "Effect of parity and suture type on the reproductive performance of beef cows submitted to caesarean section." Master's thesis, Universidade de Lisboa. Faculdade de Medicina Veterinária, 2014. http://hdl.handle.net/10400.5/7618.

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Dissertação de Mestrado [Integrado] em Medicina Veterinária<br>In cattle production a good reproductive performance is essential to the herd's efficiency. In beef herds, the calf is the major product and so maximum reproductive efficiency is paramount in determining the herd's profitability. In a large number of cattle farms, reproduction is not optimal, which may have an important negative effect on the herd's economy. Therefore, the main goal of this work is to understand the influence of the caesarean section in the reproductive performance, specifically in the calving interval, breeding i

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Bennett, Bradley Wayne. "The effects of nutrition and reproductive strategies on performance of beef cattle grazing native shortgrass range in western Kansas." Thesis, Kansas State University, 2013. http://hdl.handle.net/2097/16294.

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Master of Science<br>Department of Animal Sciences and Industry<br>John Jaeger<br>Cattle grazing dormant native range (< 7% crude protein; CP) require supplementation of additional protein to sustain body weight (BW) and body condition score (BCS). Daily delivery of these supplements is an economic burden to cattle producers faced with challenging economic circumstances. Supplementing cows infrequently (as little as once/week) has produced equivalent BW and BCS changes compared to daily delivery. Dried distiller’s grains with solubles (DDGS) provides more ruminally-undegradable protein (RUP; 5

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Douglas, Jamie Marguerite. "INVESTIGATING THE USE OF BLESSED THISTLE FOR AMELIORATION OF SYMPTOMS OF FESCUE TOXICITY IN BEEF COWS CONSUMING ENDOPHYTE-INFECTED TALL FESCUE SEED." OpenSIUC, 2015. https://opensiuc.lib.siu.edu/theses/1781.

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The present investigation was designed to investigate the use of blessed thistle (Cnicus benedictus) in amelioration of fescue toxicosis in beef cattle. Twenty-seven crossbred Angus cows were blocked by age and weight into groups of three. Each group (n=9) was then randomly assigned to one of three dietary treatments: endophyte-free (EF), endophyte-infected (EI), or endophyte-infected with addition of cut and stemmed blessed thistle (EIBT). Each group was also randomly assigned to one of three 29-day replicates. Parameters measured during this trial included: urinary ergot alkaloid concentrati

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Pinto, de Andrade Luis Pedro Mota. "Effects of gonadotrophin-releasing hormone and bovine somatotrophin on hormone profiles and ovarian function in postpartum beef cows." Thesis, University of Edinburgh, 1994. http://hdl.handle.net/1842/29325.

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Reproductive efficiency in beef cows is limited by the length of the postpartum anoestrous period which in turn is controlled by pituitary gonadotrophins and gonadal steroids and/or proteins. The first aim of this study was to elucidate the role of LH pulses in the development of ovarian activity in postpartum beef cows, specifically to determine whether or not the normal, relatively slow process of follicular development could be accelerated in cows in low body condition (BC) with pulses of gonadotrophin-releasing hormone (GnRH). The second aim was to determine the role of the metabolic hormo

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Silva, Felipe. "The Effects of Injectable Trace Mineral Supplements in Donor Cows at the Initiation of a Superovulation Protocol on Embryo Outcomes and Pregnancy Rates in Recipient Females." Thesis, North Dakota State University, 2018. https://hdl.handle.net/10365/28856.

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Concentrations of trace minerals within the body are known to impact reproductive processes. Thus, the current study analyzed the effects of using an injectable trace mineral supplement containing selenium, zinc, copper, and manganese during a superovulation protocol on embryo outcomes in donor beef cows and further effects on pregnancy rate in recipient females. We hypothesized that an injectable trace mineral (TM) supplement provided to cows fed to meet known nutrient requirements would increase TM status and influence superovulation, embryo characteristics, and enhance pregnancy rates. Our

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Zimprich, Craig Allen. "Effects of Protein Supplement During the Last Third of Pregnancy on Blood Flow to the Mammary Gland in Beef Cows." Thesis, North Dakota State University, 2016. https://hdl.handle.net/10365/27976.

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Calves born to cows fed a protein supplement during late pregnancy have greater production characteristics compared to calves from cows not supplemented, despite similar birth weights. Our hypothesis was that cows receiving protein supplement during late gestation would have greater mammary gland blood flow allowing for enhanced lactation. Mammary gland hemodynamics were recorded during late gestation. While protein supplementation did not alter the blood flow to the mammary gland, this data demonstrates that mammary gland blood flow can be monitored during late pregnancy.

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Hoar, Melanie E. "USE OF MTB-100TM, PROVIDED THROUGH A MINERAL MIX, TO REDUCE TOXICITY WHEN LACTATING BEEF COWS GRAZE ENDOPHYTE-INFECTED TALL FESCUE." UKnowledge, 2013. http://uknowledge.uky.edu/animalsci_etds/20.

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Two experiments were conducted at the University of Kentucky, Eden Shale Farm, Owenton, KY to evaluate the use of MTB-100TM (Alltech, Inc., Nicholasville, KY) to alleviate the symptoms of fescue toxicity when lactating Angus x Beefmaster cows and their calves grazed endophyte-infected KY-31 tall fescue. Experiment 1 provided a carbohydrate based toxin adsorbent, MTB-100TM, ad libitum in a commercial mineral supplement to project a daily consumption rate of 0, 20 or 40 g of MTB-100TM per cow. Cows were weighed, assigned a body condition score (BCS) and hair coat score (HC), rectal temperatures

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