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Teses / dissertações sobre o tema "Sheep Reproduction"

Autor: Grafiati

Publicado: 4 de junho de 2021

Última modificação: 31 de janeiro de 2023

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1

Nassiri, Mohammad Taghi Beigi. "Aspects of prolificacy in Cambridge sheep." Thesis, Bangor University, 1996. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.321435.

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2

Ibraheem, Majid. "The manipulation of seasonality of reproduction in sheep." Thesis, University of Aberdeen, 1991. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.332379.

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The phenomenon of seasonability of reproduction restricts the ewe to only one lambing around the same time every year, which in turn prevents an even supply of lamb meat to the market. The long term objective of the current study was to develop two systems of early and summer lambing using alternative techniques for the manipulation of sheep production in an attempt to produce high quality lamb throughout the year. In recent years, major advances in our knowledge of seasonality of reproduction have been the recognition of the integral role of the pineal gland and its indoleamine melatonin in t

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3

Archer, Zoe Anne. "Neuroendocrine control of appetite and reproduction in sheep." Thesis, University of Aberdeen, 2001. http://digitool.abdn.ac.uk/R?func=search-advanced-go&find_code1=WSN&request1=AAIU602029.

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Reproductive neuroendocrine activity and appetite are modulated at the hypothalamus by both nutritional status and photoperiod in the seasonal animal. The objectives of this work were (1) to measure circulating hormones and/or metabolites that relay information about peripheral nutritional status to the hypothalamus, (2) to identify which hypothalamic neuropeptides and receptors that are responsive to photoperiodic and nutritional feedback and (3) to establish which changes in peripheral signals and/or hypothalamic neuropeptides are associated with alterations in the activity of the reproducti

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4

Singh, Inderjeet. "Embryonic survival in adrenal hyperactivity in sheep." Thesis, University of Liverpool, 1994. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.386839.

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5

Ferasyi, Teuku Reza. "Mathematical model of the reproductive endocrine system in male sheep." University of Western Australia. School of Animal Biology, 2008. http://theses.library.uwa.edu.au/adt-WU2008.0080.

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[Truncated abstract] The activity of the reproductive endocrine axis is the result of interactions among many organs and tissues, particularly the hypothalamus, pituitary gland and gonad. However, it depends on more than the communication between anatomical structures because it is also affected by genotype, internal factors (e.g., metabolic inputs) and external factors (e.g., photoperiod, socio-sexual cues, stress, nutrition). This multifactorial complexity makes it difficult to use animal experimentation to investigate the pathways and mechanisms involved. Therefore, in this study, I have tu

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6

Holmberg, Bradford J. "Influence of the vagus nerve and urocortin on the nutrition-reproduction axis of the ovine /." free to MU campus, to others for purchase, 2002. http://wwwlib.umi.com/cr/mo/fullcit?p3074407.

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7

Tempest, Louisa-Jayne. "Parasites and the costs of reproduction in Soay sheep." Thesis, University of Stirling, 2005. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.720356.

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8

Hawken, Penelope Alison Rhian. "The role of socio-sexual cues in sheep reproduction." Thesis, University of Newcastle Upon Tyne, 2006. http://hdl.handle.net/10443/1660.

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Exposure of previously isolated anoestrous ewes to a ram induces an almost instantaneous rise in luteinising hormone (LH) pulse frequency. This physiological response, a phenomenon coined 'the ram effect' is commonly sufficient to override the seasonal suppression of the hypothalamic-pituitary axis and induce a synchronous first ovulation. The objective of the first series of experiments in this thesis was to develop a nonpharmacological method of oestrus synchronisation, using socio-sexual cues, for natural mating of mule ewes during the breeding season. Initially two experiments were conduct

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9

Bancroft, David. "Genetic variation and fitness in Soay sheep." Thesis, University of Cambridge, 1993. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.338112.

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10

Fray, Martin Dennerley. "Gonadotrophin release in post parturient cattle and sheep." Thesis, University of Nottingham, 1992. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.314751.

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11

Moore, Céline. "Genetic influence on predictability of reproductive potential of rams." Thesis, McGill University, 1986. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=65523.

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12

Pickard, R. M. "The role of omega-3 fatty acids in sheep reproduction." Thesis, University of Newcastle Upon Tyne, 2006. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.433539.

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13

Zhang, Song. "Peripheral and central pathways linking metabolic status and reproduction in male sheep." University of Western Australia. School of Animal Biology, 2005. http://theses.library.uwa.edu.au/adt-WU2005.0037.

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[Truncated abstract] Reproductive activity is affected by external factors such as photoperiod, social cues, stress and nutrition, all of which can alter the pulsatile activity of the GnRH neurons, which is the major neuroendocrine system used by the brain to control gonadal function. In the male Merino sheep, nutrition is one of the most powerful factors that affect pulsatile LH secretion, used commonly to bioassay GnRH neuronal activity. More accurately, the reproductive system responds to “metabolic status”, rather than “nutrition”, and the three factors that contribute to metabolic status

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14

Hughes, Michelle Ann. "Molecular analysis of ovulation rate in the Cambridge ewe." Thesis, Bangor University, 1995. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.295279.

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15

Audicana, Lina. "Cervical ripening with PGEâ†2 for transcervical embryo transfer in sheep : studies of EPâ†3 receptor mRNA." Thesis, University of Glasgow, 1997. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.241745.

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16

Melnyk, Peter M. (Peter Michael). "Estrogen regulation of testicular function in the adult ram." Thesis, McGill University, 1989. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=59414.

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During the nonbreeding season (July), three groups of five Dorset x Leicester x Suffolk rams were assessed over a period of 5 days. One group of rams (control) was implanted (sc) with five 5cm empty Silastic capsules (i.d. 3.4mm, o.d. 4.6mm); two other groups, designated as Low-E$ sb2$ and High-E$ sb2$, received five estradiol filled capsules of either 5cm or 10cm, respectively for 4 days. Estradiol treatment elevated serum estradiol concentration about 150% in the Low-E$ sb2$ groups (15.7 $ pm$ 1.3 pg/ml) and 300% in the High-E$ sb2$ groups (26.6 $ pm$ 2.4 pg/ml) compared with controls (6.3 $

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17

Lewis, Ronald Martin. "Reproductive performance of dorset ewes in the star accelerated lambing system." Diss., This resource online, 1990. http://scholar.lib.vt.edu/theses/available/etd-08252008-162636/.

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18

Yarney, Thaddeus A. "Sexual maturational changes in the pituitary and testes of ram lambs and predictability of adult reproductive function." Thesis, McGill University, 1985. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=72049.

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Spring-born ram lambs were used to examine: (1) sexual maturational changes in LH, FSH and prolactin (PRL) secretion, testicular gonadotropin receptors, and testicular size and function; (2) predictability of yearling ram reproductive function from juvenile testicular size and reproductive hormone measurements. Despite continuous increases in testis size, serum LH-profile characteristics became greatest between 2 and 4 months and declined thereafter. However, LH-peak frequency increased by about 2-fold between 6 and 7 months; this was associated with marked increases in testosterone (T) secret

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19

Chandrasekhar, Yallampalli. "Interactions between thyroid hormones and reproductive function in prepubertal and sexually mature merino rams /." Title page, contents and summary only, 1985. http://web4.library.adelaide.edu.au/theses/09PH/09phc4567.pdf.

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20

Rosa, Henrique Jose Duarte. "The effect of the intensity of stimulation upon the response of seasonal anoestrous ewes to the introduction of rams." Thesis, University of Reading, 1998. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.266740.

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21

Vasquez, Hidalgo Manuel Alexander. "Effects of Nutrient Restriction, Realimentation, and Twinning on Plasma Volume, Umbilical Hemodynamics and Placental Characteristics in the Pregnant Adolescent Ewe." Diss., North Dakota State University, 2019. https://hdl.handle.net/10365/31573.

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Reproductive physiology in production animals is a key economic component of longevity and profitability of animal farming. There are several components that can benefit or compromise adequate pregnancy periods. Sheep production is not only a very important economic activity for farmers around the United States, but sheep are also an important medical and surgical model to study human diseases. Our findings suggest that estradiol-17 beta could be involved in acute increased plasma volume early in gestation which can benefit overall gestation. We report that umbilical blood flow decreases upon

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22

Quintana, Casares Pablo Ignacio. "Studies on the relationship between characteristics of ram semen and fertility." Title page, contents and summary only, 1991. http://web4.library.adelaide.edu.au/theses/09PH/09phq7.pdf.

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Includes bibliographical references (leaves 274-316) Examines several aspects of male reproduction in the sheep, and how these are related to fertility in the female when semen is introduced by natural mating or artificial insemination.

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23

Kiyma, Zekeriya. "Effects of feed restriction and dietary oil supplementation on reproduction in sheep." Laramie, Wyo. : University of Wyoming, 2005. http://proquest.umi.com/pqdweb?did=888862061&sid=1&Fmt=2&clientId=18949&RQT=309&VName=PQD.

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24

Dobbins, Adam Bradley. "Potential mechanisms linking nutrition and neuroendocrine control of reproduction in the sheep." Morgantown, W. Va. : [West Virginia University Libraries], 2004. https://etd.wvu.edu/etd/controller.jsp?moduleName=documentdata&jsp%5FetdId=3615.

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Thesis (M.S.)--West Virginia University, 2004.<br>Title from document title page. Document formatted into pages; contains iv, 124 p. : ill. (some col.). Includes abstract. Includes bibliographical references (p. 82-124).

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25

Al-Shorepy, Salih Abdu. "Selection to improve spring fertility in a crossbred sheep population." Diss., Virginia Tech, 1995. http://hdl.handle.net/10919/40136.

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Reproductive and productive performance of a composite sheep population, containing 50% Dorset, 25% Rambouillet and 25% Finn sheep breeding and under selection for ability to lamb in the fall, was evaluated. Traits considered were spring fertility, faIl litter size, live weights at birth, weaning, and at about 90 and 120 d of age, and scrotal circumference at weaning and at about 90 and 120 d of age. Fertility was defined as 1 or 0 depending upon whether a ewe lambed or failed to lamb, respectively, in fall. Litter size was defined as the number of lambs born per ewe lambing. A total of 1,102

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26

Falchi, Laura. "Transcervical artificial insemination and physiology of the cervix of the sheep." Thesis, Royal Veterinary College (University of London), 2010. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.558963.

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27

Baker, Susan Jane. "Regulation of gonadotropin receptors in the testis of the adult ram." Thesis, McGill University, 1987. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=72092.

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Factors influencing testicular gonadotropin receptors and testis responsiveness to luteinizing hormone (LH) stimulation were studied during the seasonal sexual cycle of the adult ram. The normal variation in testis content of gonadotropin receptors was mapped out in relation to changes in (1) testis size, (2) testis responsiveness to LH stimulation and (3) mean serum concentration of LH, follicle stimulating hormone (FSH), testosterone and prolactin (PRL). The increase in gonadotropin receptor numbers during testicular redevelopment was preceded by elevated serum concentrations of PRL and asso

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28

Kassem, Riad. "Reproduction in the Awassi ewe particular reference to increasing efficiency under semi-arid conditions." Thesis, Bangor University, 1986. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.328270.

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29

Jordan, Katherine Mead. "Characterization of seasonal reproduction in Virginia Tech Selection Line, St. Croix, and Suffolk ewes." Diss., Virginia Tech, 2008. http://hdl.handle.net/10919/28663.

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This dissertation research contained three studies. The first two studies were conducted to investigate the ability of ewes to rebreed while lactating during seasonal anestrus. Breeds studied included the Virginia Tech Out-of-season (OOS) Line, which is a wool line genetically selected to lamb in the fall, and the St. Croix, a hair breed of tropical origin thought to be lowly seasonal. When January-lambing ewes were exposed to rams while lactating in April, significantly more OOS than St. Croix ewes were marked by rams in the first 21 d and total 39 d of ram exposure (58.3 vs. 8.7%, P = 0.0

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30

Nugent, Russell A. III. "Effects of breed and ram exposure on Spring estrous behavior and Summer fertility in domestic ewes." Thesis, Virginia Tech, 1987. http://hdl.handle.net/10919/44057.

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The present studies were conducted to check the effects of acute ram introduction into a flock of anestrus ewes in Virginia. Ewes were bled via jugular venipuncture twice weekly and serum samples were radioimmunoassayed for progesterone (P4) content as an indicator of estrous activity. All rams were fitted with crayon equipped marking harnesses for use as an indicator of mating behavior in ewes. The first study tested the effects of introduction of vasectomized rams into a flock: of' 50 Dorset (D) and 50 Hampshire (H) purebred ewes in either May or June. More D ewes ovulated (96% vs

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31

Long, Amanda Marie. "Impacts of Flax on Female and Male Reproductive Traits When Supplemented Prior to Breeding in Sheep." Thesis, North Dakota State University, 2018. https://hdl.handle.net/10365/29877.

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Two experiments determined the effects of flaxseed supplementation on reproductive parameters in sheep. In experiment one, 240 multiparous Rambouillet ewes were assigned to one of two treatments: basal ration alone or basal ration with a Flaxlic® Sheep Tub offered over 35 days. Serum was collected weekly for progesterone (P4). Flaxseed supplementation did not improve progesterone concentration or reproductive parameters (P ≥ 0.26). In experiment two, 120 Rambouillet ram lambs were assigned to one of two treatments: basal ration alone or basal ration with a Flaxlic® Sheep Tub offered over 112 d

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32

Robinson, Julie A. "The effects of dietary molybdenum and sulfur on serum copper concentrations, growth and reproductive function in lambs." Thesis, University of British Columbia, 1991. http://hdl.handle.net/2429/31319.

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Feeds often contain molybdenum (Mo) and sulfur (S) in excess of recommended allowances for adequate copper (Cu) absorption by ruminant livestock. Two randomized-block experiments were conducted using lambs given a cereal-based diet (90% of dry matter (DM) intake), containing 8 mg Cu, 0.7 mg Mo and 2.1g S per kg DM, that was either unsupplemented or supplemented with ammonium molybdate or sodium sulfate alone or in combination, to determine the effects of Mo, S and Mo+S on growth, hematology, serum Cu and Mo concentrations and reproductive function. Short term intake (4 weeks) by rams, aged 18

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33

Ribeiro, Mafalda Maria dos Santos Vidal. "Caracterização produtiva e reprodutiva do rebanho de raça Merino Branco da Fundação Eugénio D'Almeida." Master's thesis, ISA/UTL, 2012. http://hdl.handle.net/10400.5/5296.

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34

Hartman, Carina. "A mixed-model evaluation for growth and reproduction parameters in a SA mutton Merino flock." Diss., Pretoria : [s.n.], 2000. http://upetd.up.ac.za/thesis/available/etd-01242003-092447.

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35

Schoombee, Cornelius Johan Albertus. "The Damara sheep : an appraisal of its reproductive performance and potential." Thesis, Stellenbosch : University of Stellenbosch, 1998. http://hdl.handle.net/10019.1/5481.

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36

Skinner, Donal C. "The pars tuberalis and its possible role in the control of seasonal reproduction in sheep." Thesis, University of Cambridge, 1994. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.320052.

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37

Rao, Shaoqi. "Genetic Analysis of Sheep Discrete Reproductive Traits Using Simulation and Field Data." Diss., Virginia Tech, 1997. http://hdl.handle.net/10919/30490.

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The applicability of restricted maximum likelihood (REML) in genetic analyses of categorical data was evaluated using simulation and field data. Four genetic models were used to simulate underlying phenotypic variates, which were derived as the sum of additive genetic and environmental effects (Model 1A and 1B) or additive genetic and permanent and temporary environmental effects (Model 2A and 2B). Fifty-eight replicates were simulated, each of which contained 5000 ewes by 500 sires and 5000 dams and with up to five records per ewe. The usual transformation of heritability estimated on the cat

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38

Lier, Elize van. "Sex differences in response to adrenocorticotropin (ACTH) administration in sheep /." Uppsala : Dept. of Clinical Chemistry, Swedish Univ. of Agricultural Sciences, 2003. http://epsilon.slu.se/v157.pdf.

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39

Vanimisetti, Hima Bindu. "Genetic evaluation of ewe productivity and its component traits in Katahdin and Polypay sheep." Diss., Virginia Tech, 2006. http://hdl.handle.net/10919/29760.

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The objectives of this dissertation were to evaluate genetic influences on ewe productivity, its growth and reproductive components, and measures indicative of accelerated lambing performance. Genetic parameters were estimated for total weight of litter weaned per ewe lambing (TW) and its components, number of lambs born (NB), number of lambs weaned (NW) and average weight of lambs weaned (AW), measured as traits of the ewe, and lamb survival (LS) and weaning weight (WW), measured as traits of the lamb, in Katahdin sheep. Heritabilities of TW, NB, NW, and AW, were 0.12, 0.12, 0.09, and 0.13, r

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40

Fossceco, Stewart Lee. "Logistic growth curve parameter estimates for scrotal circumference and relationships with female reproduction in crossbred sheep." Diss., Virginia Tech, 1991. http://hdl.handle.net/10919/37241.

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Data from two groups of lambs were analyzed. In group one, seasonal patterns of testis growth through 16 mo of age were assessed on 40 spring-born ram lambs (eight Barbados Blackbelly, 10 Suffolk and 22 1/2-Dorset, 1/4-Finnish Landrace, 1/4-Rambouillet). Scrotal circumference (sc) and body weight (wt) were measured at mean ages of 30, 62, 96, 124, 153, 180, 212, 243, 290, 333, 364, 398, 427, 454, 488 and 517 d. A multivariate repeated measures analysis indicated that there were breed differences in ram sc and wt measurements at each age. When logistic growth curves were fit to ram sc data, bre

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41

Helliwell, Rachel J. A. "Target sites for melatonin in the sheep with particular reference to the photoperiodic control of reproduction." Thesis, University of Aberdeen, 1992. http://digitool.abdn.ac.uk/R?func=search-advanced-go&find_code1=WSN&request1=AAIU602270.

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The aim of this study was to identify the potential target sites for the action of melatonin in sheep and to relate the findings to the photoperiodic control of reproductive activity in the female. It has been proposed that melatonin may have a direct luteotrophic role in several species, therefore the first experiment in this thesis was designed to investigate if melatonin acts directly on the ovine ovary to enhance progesterone production. The oral administration of 3mg melatonin, daily at 1500h, to anoestrous Blackface ewes advanced the onset of oestrous cyclicity and was associated with an

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42

Wagner, Hans-Gerhard R. "The impact of strategic anthelmintic treatments on reproduction and productivity in Djallonké sheep in the Gambia /." [S.l.] : [s.n.], 1995. http://www.ub.unibe.ch/content/bibliotheken_sammlungen/sondersammlungen/dissen_bestellformular/index_ger.html.

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43

Kakar, Muhammad Azam. "Effect of peri-conceptional feed intake on early embryo development and fetal growth in the Merino ewe /." Title page, table of contents and abstract only, 2003. http://web4.library.adelaide.edu.au/theses/09ANP/09anpk138.pdf.

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44

Carpenter, Karen Denise. "The roles of estradiol-17 beta and prolactin in uterine gland development in the neonatal ewe." Texas A&M University, 2005. http://hdl.handle.net/1969.1/2731.

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Endometrial glands are required for adult uterine function and develop post-natally in mammalian species. Therefore, studies were conducted using neonatal ewes as a model to determine: 1) the roles of estradiol-17-alpha and estrogen receptor-alpha (ER-beta) in endometrial gland development; 2) the role of ovaries in endometrial gland development; 3) the role of prolactin in endometrial gland development; and 4) factors regulating prolactin receptor expression in endometrial glands. Study one determined the effects of neonatal exposure of ewes to estradiol-17-alpha valerate (EV); EM-800, an ER-

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45

Ilse, Breanne Rose. "Effects of Linseed Meal on Growth and Reproductive Performance in Ruminants." Thesis, North Dakota State University, 2011. https://hdl.handle.net/10365/28744.

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Linseed meal (LSM) was fed to ovariectomized ewes exposed to estradiol 17-? (E2) implants over time, and LSM was supplemented to beef cows during late gestation and early lactation to evaluate the estrogenic potential of the phytoestrogen secoisolariciresinol diglycoside (SDG) found in LSM. Forty-eight ovariectomized ewes were fed a diet containing 12.5% LSM for 0, 1, 7, or 14 d and implanted with estradiol-17? (E2) for 0, 6, or 24 h before tissue collection. Uterine cellular proliferation, vascularity, and the expression of the angiogenic factors and their receptors were recorded.

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46

Earl, Colin R. "The regulation of the timing of melatonin secretion in the sheep." Title page, summary and table of contents only, 1989. http://web4.library.adelaide.edu.au/theses/09PH/09phe12.pdf.

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Includes bibliographical references (leaves 166-195) Addresses the nature of the central mechanisms involved in the regulation of the circadian pattern of secretion of the pineal hormone melatonin in the highly seasonal Suffolk breed of sheep. Provides new information on the behaviour of the onset and offset of melatonin secretion under different photoperiodic conditions.

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47

Alhamada, Alhamada Moutaz. "Les chevauchements, enregistrés automatiquement lors de la reproduction des ovins, sont indicateurs de la libido des béliers et de la valeur reproductive des brebis." Thesis, Montpellier, SupAgro, 2016. http://www.theses.fr/2016NSAM0032/document.

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La demande en produits animaux pousse les éleveurs à réduire les intrants et supprimer les traitements hormonaux pour la maîtrise de la reproduction des ovins. Ces exigences ont relancé les études sur des méthodes qui s’appuient davantage sur les comportements spontanés des mâles et des femelles. Le détecteur électronique des chaleurs, développé par l’UMR Selmet, semblait prometteur et il fallait l’accompagner de validations expérimentales. Ces études ont été réalisées en race Mérinos d’Arles du Domaine du Merle qui sont élevées en système d’élevage extensif et se reproduisent à contre saison.

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48

Hanon, Elodie. "A novel model of action for TSH (thyrotropin stimulating hormone) in the mammalian neuroendocrine system." Thesis, Available from the University of Aberdeen Library and Historic Collections Digital Resources, 2009. http://digitool.abdn.ac.uk:80/webclient/DeliveryManager?application=DIGITOOL-3&owner=resourcediscovery&custom_att_2=simple_viewer&pid=53386.

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49

Stradiotto, Monalissa de Melo [UNESP]. "Efeito da gordura protegida sobre a composição do leite, anestro pós-parto, resposta às infecções parasitárias e desempenho de cordeiros, em ovelhas da raça Bergamácia." Universidade Estadual Paulista (UNESP), 2007. http://hdl.handle.net/11449/96628.

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Made available in DSpace on 2014-06-11T19:28:24Z (GMT). No. of bitstreams: 0 Previous issue date: 2007-07-31Bitstream added on 2014-06-13T20:58:04Z : No. of bitstreams: 1 stradiotto_mm_me_botfmvz.pdf: 530763 bytes, checksum: e4530e5d16068efeff8131c5fdeac6fc (MD5)<br>Conselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq)<br>Universidade Estadual Paulista (UNESP)<br>No Brasil, muito pouco se conhece sobre o leite ovino, pois a maioria das raças brasileiras são especializadas para a produção de carne ou lã, mas é possível encontrar animais com aptidão leiteira. O presente trabalho

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Griffith, Ronald D. "Thyroid hormones are required during long-day photoperiods for the establishment of estradiol-sensitive afferent input to and activation of, dopaminergic neurons in the A15 area of the ovine hypothalamus." Morgantown, W. Va. : [West Virginia University Libraries], 2000. http://etd.wvu.edu/templates/showETD.cfm?recnum=1580.

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Thesis (M.S.)--West Virginia University, 2000.<br>Title from document title page. Document formatted into pages; contains viii, 46 p. : ill. (some col.). Includes abstract. Includes bibliographical references (p. 33-38).

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