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Rozprawy doktorskie na temat „Weaning weight”

Autor: Grafiati

Data publikacji: 4 czerwca 2021

Data aktualizacji: 25 lipca 2025

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1

Ligon, Jennifer Marie. "The Effects of Low Stress Cattle Handling and Weaning Training on Post-Weaning Weight Gain and Calf Activity." Thesis, Virginia Tech, 2015. http://hdl.handle.net/10919/51262.

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The objective of this study was to assess the effect of low stress (LS) handling of beef calves on weight gain and calf activity associated with the weaning process. Cattle were of Angus and Angus cross breeding from two separate herds in Virginia. Handlers for the LS groups went through a short training session. Handlers for the Control (C) groups did not have any special training and handled their group as they would have with no adjustments. Handling and calf activity were monitored each time (6 times) the cows were worked from calving through one month post-weaning. Weights were taken

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Khombe, Carroll Themba. "The inheritance of weaning weight in Mashona cattle grazing on free range in Zimbabwe." Thesis, McGill University, 1994. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=41636.

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Genetic parameters were estimated using 8086 weaning weight records of Mashona cattle from commercial herds in Zimbabwe, through Derivative-free Restricted Maximum Likelihood (DFREML) procedure fitting an individual animal model. All known additive relationships among animals were incorporated and all sires were assumed to have been bred by unknown parents. A simulation study was carried out to estimate the amount of bias in the estimated genetic parameters caused by the failure to account for the true relationships among the breeding animals.<br>Genetic differences between the weaning weights

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3

Nielsen, Per Peetz. "Behaviours related to milk intake in dairy calves : the effects of milk feeding and weaning methods /." Skara : Dept. of Animal Environment and Health, Swedish University of Agricultural Sciences, 2008. http://epsilon.slu.se/200811.pdf.

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Correia, Maria Rasquilha Corado Ribeiro. "Efeito da utilização de um alimento diferenciado no primeiro terço de gestação na produtividade das porcas." Master's thesis, ISA, 2014. http://hdl.handle.net/10400.5/7074.

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Mestrado em Engenharia Agronómica - Agro-pecuária - Instituto Superior de Agronomia<br>The main aim of this work was to study the effect of a diet with 15% of crude protein in early gestation on sow’s productivity. The study included 40 sows divided into two treatments, control (13% of crude protein) and test, with three repetitions. There was obtained an average piglets born alive per litter of 12,4 in control treatment and 13,51 in test (P>0,05). Pre-weaning mortality was 1,43 piglets per sow in control treatment and 1,16 piglets per sow in test treatment (P>0,05). There was a significant i

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Nadarajah, Kanagasabai. "Evaluation of phenotypic and genetic trends in weaning weight in Angus and Hereford populations in Virginia." Diss., Virginia Polytechnic Institute and State University, 1985. http://hdl.handle.net/10919/74717.

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Total weaning weight records of 29,832 Angus and 15,765 Hereford calves born during 1953 through 1983 in Virginia were used to evaluate phenotypic and genetic trends for adjusted weaning weight (AWWT), weaning weight ratio (WWR) and deviation of AWWT from the mean AWWT of the contemporaries (DEVN). Two approaches, namely the regression techniques and maximum likelihood (ML) procedure were taken to estimate the above trends. The estimates of annual phenotypic trend for AWWT in the Angus and Hereford breeds were .96 and .82 kg/yr, respectively. The sire and dam genetic trends obtained from bot

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Melka, Hailu Dadi. "Genetic parameter estimates for weaning traits in a multibreed beef cattle population." Thesis, Stellenbosch : Stellenbosch University, 2001. http://hdl.handle.net/10019.1/52285.

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Thesis (MScAgric)--University Stellenbosch, 2001.<br>ENGLISH ABSTRACT: The aim of this study was to estimate genetic parameters as well as to evaluate the influence of some genetic factors on preweaning growth traits in a multi breed beef cattle population. These preweaning growth traits were birth weight (BW), weaning weight (WW) and average daily gain (ADG). Three aspects were addressed in this particular study; namely the Estimation of (co)variance components and genetic parameters, the effect of sire breeds and dam genotypes and the contribution of Charolais and Angus breeding levels

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Dierking, Shannon L. "An appraisal of the effect of nursing location on weaning weight of piglets and its dependence on the feeding of essential oils to sows." UKnowledge, 2019. https://uknowledge.uky.edu/animalsci_etds/106.

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The objective of these studies was to evaluate the effect of piglet nursing location on weaning weight, and its dependence on essential oil supplementation on sow and piglet performances. Piglets that nursed anterior teat pairs had heavier weaning weights and higher gain for the lactation period. Additionally, piglet birthweight did not impact their overall teat selection and nursing location. These results provide some insight into the biological aspects of sow milk production, and implied that milk yield may vary between teat pairs along the udder line. Supplementation of essential oils (EO)

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Luna, Isita Darwin Juan. "Effect of early weaning on piglet weight gain and fertility in sows (Sus scrofa) in Carmen Pampa of Nor Yungas - La Paz." BYU ScholarsArchive, 2006. https://scholarsarchive.byu.edu/etd/5388.

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This study was carried out in swine production facilities of the School of Veterinary Medicine and Zootechnic Studies at the Rural Academic Unit of Carmen Pampa. The objective of this study was to evaluate the effects of weaning male and female piglets at different times on their weight gain and the fertility of the sows. Four three year old sows that had a total of 40 piglets (25 males and 15 females) were used. The piglets were distributed across the following treatments: T1 - weaning 9 piglets (5 males and 4 females) at 56 days, T2 - weaning 13 piglets (7 males and 6 females) at 46 days, T3

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Mashiloane, Majela Lesley. "Effect of selection at weaning on genetic parameters of weight gain for centralized and on farm test for beef bulls." Thesis, University of Limpopo (Turfloop Campus), 2007. http://hdl.handle.net/10386/788.

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Thesis (M.Sc.) (Agriculture) --University of Limpopo, 2007<br>The objectives of this study were to evaluate the effect of pre-weaning selection on estimates of genetic parameters for post-weaning average daily gain in Phases C (ADG-C) and D (ADG-D) and to estimate genetic relationships between average daily gain in the two phases. Performance records of the South African Angus cattle breed was used in the analysis. (Co)variance components and genetic parameters for weaning (WWT), AGD-C and ADG-D were estimated by REML procedures fitting three different models (Models 1, 2 and 3) that differed

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Furtado, Cristiane da Silva Duarte. "Influência do peso ao nascimento e lesões no desempenho de leitões lactantes." reponame:Biblioteca Digital de Teses e Dissertações da UFRGS, 2007. http://hdl.handle.net/10183/12443.

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O peso dos leitões ao desmame está positivamente relacionado com o desempenho posterior e sofre influência de diversos fatores relacionados ao ambiente, à matriz e aos próprios leitões. O peso ao nascimento, a presença de lesões orais, dentárias, umbilicais e no aparelho locomotor podem comprometer o ganho de peso dos leitões na maternidade. Foram acompanhados 2004 lactentes, os quais foram pesados e avaliados para a presença de lesões no primeiro dia e aos 7, 14 e 21 (desmame) dias de vida. Leitões nascidos com peso entre 600g e 900g tiveram mortalidade até o desmame superior àqueles pesando

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Tantasuparuk, Wichai. "Sow reproductive performance in Thailand : effects of climate, breed, parity, lactation length, weight loss during lactation and weaning-to-service interval /." Uppsala : Swedish Univ. of Agricultural Sciences (Sveriges lantbruksuniv.), 2000. http://epsilon.slu.se/avh/2000/91-576-5938-9.pdf.

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Kearnan, Jeffrey Mark. "Pre- and postpartum nutritional effects on milk production, milk composition, calf weaning weight and postpartum reproductive performance of commercial beef cows." Thesis, Virginia Tech, 1991. http://hdl.handle.net/10919/41535.

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The purpose of this study was to investigate the effect of prepartum and postpartum nutrition on milk production of commercial beef cows. Forty-three Angus or Angus X Holstein females, ranging in age from 2 to 6 yr, were randomly assigned by age and percentage Holstein within age to one of two prepartum grazing treatments (PRE). All females, regardless of PRE, were assigned at calving to receive the same post-calving nutritional energy. Females were assigned at calving by age, percentage Holstein within age, prepartum nutritional treatment and calving date to one of two milking groups. Milk we

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Barrozo, Diego. "Estudo de características de desempenho e medidas por escores visuais em bovinos Nelore /." Jaboticabal : [s.n.], 2009. http://hdl.handle.net/11449/92554.

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Orientador: Sandra Aidar de Queiroz<br>Banca: João Ademir de Oliveira<br>Banca: William Koury Fillho<br>Resumo: O objetivo foi estudar a influência da idade da vaca ao parto (IVP), da idade do animal ao sobreano (IS) e do peso ao sobreano (PS) sobre os escores de conformação (C), precocidade (P), musculatura (M) e temperamento (T) ao sobreano de animais Nelore; estimar a herdabilidade (h²) destas características, empregando-se diferentes modelos estatísticos e estimar as co-variâncias e correlações entre T e as características reprodutivas perímetro escrotal (PE), idade ao primeiro parto (IPP)

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Mendes, Diogo Manuel Ribeiro. "Efeito da paridade na produtividade dos leitões até ao desmame." Master's thesis, Universidade de Lisboa, Faculdade de Medicina Veterinária, 2016. http://hdl.handle.net/10400.5/12495.

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Dissertação de Mestrado Integrado em Medicina Veterinária<br>Existem diversos fatores que poderão influenciar o tamanho da ninhada, o peso médio dos leitões ao nascimento e, posteriormente, o número de leitões desmamados/porca e o peso médio dos leitões ao desmame. Um desses fatores é a paridade. Com o intuito de avaliar a influência da paridade na produtividade dos leitões até ao desmame foi analisado o desempenho reprodutivo de 45 porcas F1 (LW x LR). Foram registados para cada porca o número de nados totais (NT), nados vivos (NV) e nados mortos (NM). Os leitões nascidos vivos foram pe

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Yehia, Badawy Elmoghazy Ahmed. "SELECTION FOR OVULATION RATE AND LITTER SIZE IN RABBITS." Doctoral thesis, Universitat Politècnica de València, 2017. http://hdl.handle.net/10251/73265.

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[EN] The aim of this thesis was to evaluate the productive performance of a rabbit line (OR-LS) selected by ovulation rate during first 6 generations (period 1), and later by ovulation rate (OR) and litter size (LS) during 11 generations using independent culling levels (Period 2). Genetic parameters, direct response for OR and LS and the correlated response for embryo (ES), foetal (FS) and prenatal survival (PS) were estimated. Also, the correlated response on growth rates (GR), weaning (WW) and marketing weight (MW) were estimated. The objective of chapter 3 was to estimate the genetic param

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Fonseca, Maria Murteira Duque. "Efeito do cruzamento de vacas Mertolengas com raças exóticas no crescimento pré-desmame e no peso ao desmame dos vitelos." Master's thesis, Universidade de Évora, 2021. http://hdl.handle.net/10174/29390.

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O presente estudo teve como finalidade avaliar o efeito da heterose, ao comparar o crescimento e o peso ao desmame de vitelos em linha pura autóctone ou provenientes de cruzamento de raças autóctones com raças exóticas. A componente prática foi concretizada em 4 explorações agropecuárias, no concelho de Évora e Arraiolos. O ensaio decorreu entre setembro de 2018, acompanhando o início da época de parição e junho de 2019, com os últimos vitelos desmamados. Como principais resultados, pode-se salientar que os vitelos Mertolengos apresentaram pesos vivos aos 90 dias, 210 dias e GMD inferiores e u

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Sphor, Luiza de ávila. "Desempenho materno-filial de ovinos da raça Ideal submetidos à tosquia pré-parto." Universidade Federal de Pelotas, 2011. http://repositorio.ufpel.edu.br/handle/ri/2591.

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Made available in DSpace on 2014-08-20T14:38:44Z (GMT). No. of bitstreams: 1 Dissertacao_Luiza_Sphor.pdf: 192588 bytes, checksum: aa72ec151e59c82db971efebafff3e6b (MD5) Previous issue date: 2011-03-02<br>The increase in consumption and valorization of sheep meat is turning this ranching activity increasingly attractive and profitable. The search for technologies to reduce the loss of lambs by neonatal death is an alternative to increase production levels in sheep raising. The objective of this study was to evaluate the effects of shearing in pregnant ewe on the birth and weaning weight

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Stradiotto, Monalissa de Melo. "Respostas fisiológicas, produtivas e comportamentais de ovelhas Santa Inês submetidas a manejos considerados estressantes e desempenho de seus cordeiros." Universidade de São Paulo, 2012. http://www.teses.usp.br/teses/disponiveis/74/74131/tde-04072012-110329/.

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Com o objetivo de avaliar a susceptibilidade de ovelhas ao estresse e a relação com a produção de leite, 50 fêmeas da raça Santa Inês foram submetidas durante 2 lactações sucessivas a quatro situações de estresse (1: estresse fisiológico padrão via administração de ACTH; 2: desmame; 3: primeira ordenha; 4: mudança de ordenhador). Foram avaliadas as respostas fisiológicas, produtivas e comportamentais das ovelhas e o comportamento e ganho de peso dos cordeiros. Na 1ª lactação, os cordeiros foram desmamados com 60 dias de idade e, na 2ª de acordo com os tratamentos: 1º Grupo com 60 dias de idade

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Monteiro, Isabela Teixeira de Resende Alves. "Parâmetros reprodutivos de uma vacada de raça alentejana infetada com leptospirose e análise dos custos diretos da doença." Master's thesis, Universidade de Lisboa, Faculdade de Medicina Veterinária, 2021. http://hdl.handle.net/10400.5/21729.

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Dissertação de Mestrado Integrado em Medicina Veterinária<br>A Leptospirose é uma doença emergente, sendo das zoonoses mais dispersas mundialmente apresenta uma elevada importância económica. Esta doença constitui uma das causas mais comuns de perdas embrionárias, aborto, nascimento de vitelos fracos e infertilidade em bovinos. Os bovinos são os hospedeiros de manutenção mais importantes do serovar Hardjo. Uma doença que afete os animais de produção, interfere de forma direta neste sistema, traduzindo-se numa perda económica. A presente dissertação de mestrado consistiu num estudo de caso ret

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Maria, Luís Eduardo Perfeito Santa. "Avaliação da eficiência produtiva da raça Mertolenga - A influência da política agrícola comum desde 1986 a 2012." Doctoral thesis, Universidade de Évora, 2020. http://hdl.handle.net/10174/28362.

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A avaliação da eficiência produtiva da raça Mertolenga e a influência da Política Agrícola Comum desde 1986 a 2012 são as linhas de pensamento subjacentes ao longo do estudo que desenvolvemos. Deste modo analisou-se a entrada de Portugal na União Europeia - à data Comunidade Económica Europeia - e o impacto que a agricultura portuguesa sofreu numa conjuntura totalmente nova. As dificuldades de integração nos novos mercados desde cedo se fizeram sentir, devido aos stocks acumulados de alguns produtos em que Portugal era deficitário, entre os quais a carne de bovino. A bovinicultura portuguesa v

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Domingues, António Manuel Silveiro. "Efeito do sexo e do peso ao desmame sobre a performance de leitões de genótipos de produção intensiva durante a primeira fase da recria." Master's thesis, Universidade de Évora, 2018. http://hdl.handle.net/10174/22916.

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Neste estudo pretendeu-se avaliar o efeito do sexo e do peso ao desmame sobre a performance de leitões em recria num sistema intensivo de produção. Utilizaram-se 2210 leitões com a idade média de 28 dias. Os leitões foram separados, em parques por sexo e por tipo (três tipos ligados ao peso ao desmame: leves, médios e pesados) e acompanhados até às nove semanas de idade, com controlo de pesos e ingestão de alimento por grupo/parque. O sexo dos leitões não influenciou globalmente a performance embora tendencialmente, os grupos de leitões fêmeas apresentaram um maior índice de conversão que os m

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Barrozo, Diego [UNESP]. "Estudo de características de desempenho e medidas por escores visuais em bovinos Nelore." Universidade Estadual Paulista (UNESP), 2009. http://hdl.handle.net/11449/92554.

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Made available in DSpace on 2014-06-11T19:26:06Z (GMT). No. of bitstreams: 0 Previous issue date: 2009-10-23Bitstream added on 2014-06-13T20:14:38Z : No. of bitstreams: 1 barrozo_d_me_jabo.pdf: 515290 bytes, checksum: 672a5fd2bc13656f7e2aa5b2c9cfe9ba (MD5)<br>Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES)<br>O objetivo foi estudar a influência da idade da vaca ao parto (IVP), da idade do animal ao sobreano (IS) e do peso ao sobreano (PS) sobre os escores de conformação (C), precocidade (P), musculatura (M) e temperamento (T) ao sobreano de animais Nelore; estimar a herda

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Maia, Cl?udia Rodrigues Souza. "Desmame em rec?m-nascidos de muito baixo peso ao nascer no primeiro retorno ambulatorial ap?s a alta hospitalar." Universidade Federal do Rio Grande do Norte, 2010. http://repositorio.ufrn.br:8080/jspui/handle/123456789/13196.

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Made available in DSpace on 2014-12-17T14:13:35Z (GMT). No. of bitstreams: 1 ClaudiaRSM_TESE.pdf: 803341 bytes, checksum: 4b80db6759e5c55e59ad18903e148c6c (MD5) Previous issue date: 2010-11-11<br>Investigate intrahospital and neonatal determinants associated to the weaning of very low birth weight (VLBW) infants. Methods: 119 VLBW (<1500g) infants 81 were monitored from July 2005 through August 2006, from birth to the first ambulatory visit after maternity discharge. This maternity unit uses the Kangaroo Method and the Baby Friendly Hospital Initiative. Results: Out of 119 VLBW infants monit

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Paula, Perla Cordeiro de. "DESEMPENHO PONDERAL DE MACHOS CHAROLÊS, NELORE E SUAS CRUZAS F1." Universidade Federal de Santa Maria, 2012. http://repositorio.ufsm.br/handle/1/10806.

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Coordenação de Aperfeiçoamento de Pessoal de Nível Superior<br>The objective of the present study was to evaluate in Charolais and Nellore calves and their crossbred F1 the genetic (crossbreed system, genetic group and heterotic and racial additive effects) and environmental effects influence on weight at birth, adjusted weight for 205, 365, 550 and 730 days of age, and daily average gain of weight from birth to 205, from 205 to 365, from 365 to 550, and from 550 to 730 days of age. Four hundred fifty eight males bovines, all belonging to the same herd, born among the year of 1985 and 1995, fr

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Thomas, Craig W. "Current practices and future possibilities of performance recording extensively-grazed commercial beef herds in New Zealand." Diss., Lincoln University, 2008. http://hdl.handle.net/10182/844.

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There is little evidence that the productivity of New Zealand beef herds has improved over time. Data from the NZ Meat and Wool Board’s Economic Service (2006) suggest that the average national calving percentage has declined over the last two decades. During the same period cattle carcass weights have increased but so too has the average cow live-weight which has resulted in increased maintenance costs of the cow herds. It is unclear whether production efficiency in the industry has improved or declined over time. The aim of this research was to develop means of improving productivity in

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Cortés, Lacruz Xavier. "Análisis de los principales factores que afectan a la productividad en la raza Parda de Montaña: nuevas propuestas para el esquema de mejora genética." Doctoral thesis, Universitat de Lleida, 2017. http://hdl.handle.net/10803/405983.

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La raça Parda de Montaña és una raça d'aptitud càrnica amb molt bona capacitat maternal fortament adaptada a les condicions extremes dels sistemes muntanyosos. Les dades utilitzades en els anàlisis d'aquesta tesi es van obtenir de les bases de dades de la associació ARAPARDA i de la finca experimental "La Garcipollera". En el capítol I s'analitza la component genètica i ambiental del caràcter facilitat de part utilitzant un model normal i un model llindar. En el capítol II s'analitza la component genètica i ambiental dels caràcters pes al naixement, pes als 90 dies, pes al deslletament, pes ad

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Arteche, Álvaro Carlos Menezes. "Avaliação do desempenho e níveis de proteção sorológica em terneiros vacinados contra tristeza parasitária bovina (TPB) comparados aos naturalmente infestados por carrapatos." Universidade Federal de Pelotas, 2011. http://repositorio.ufpel.edu.br/handle/ri/2577.

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Made available in DSpace on 2014-08-20T14:38:04Z (GMT). No. of bitstreams: 1 dissertacao_alvaro_carlos_menezes_arteche.pdf: 1268541 bytes, checksum: 48cb8939395a534c09b30fdb0ec17ef9 (MD5) Previous issue date: 2011-11-21<br>This study analyzed, by reaction to indirect immunofluorescence and individual weighting, the levels of protection and weight-gain in beef calves from birth to the age of eight month, which received two doses of vaccine against tick fever and were maintained free from ticks, compared to naturally infested calves in extensive management conditions with continuous graz

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Schenkel, André Cavalheiro. "Relação entre condição corporal de fêmeas suínas ao primeiro parto e ao desmame e a produção de leitões no segundo parto." reponame:Biblioteca Digital de Teses e Dissertações da UFRGS, 2007. http://hdl.handle.net/10183/10415.

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O objetivo deste estudo foi avaliar a influência do número de leitões paridos e desmamados no primeiro parto, das reservas corporais ao parto e a perda das reservas corporais durante a lactação sobre a produção de leitões no segundo parto. Foram analisadas 1222 fêmeas que chegaram ao segundo parto sem interrupções como retorno ao estro, abortamento ou vazias ao parto. Foram medidos o peso corporal, espessura de toucinho (ET) e escore corporal visual (ECV), no máximo 24 horas pós-parto e no dia do desmame. Foram calculados a gordura e a proteína corporal ao parto e ao desmame para posteriorment

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Marsh, Todd J. "The effect of intermittent vaccination of the beef cow herd on herd production." Thesis, Manhattan, Kan. : Kansas State University, 2008. http://hdl.handle.net/2097/658.

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Pencai, Felipe Weigert. "Efeitos do desmame precoce e da amamentação controlada de bezerros sobre a fertilidade de bovinos de corte =Early weaning and control effects in calves on beef cattle fertily / Felipe Weigert Pencai ; orientador, Luiz Ernandes Kozicki." reponame:Biblioteca Digital de Teses e Dissertações da PUC_PR, 2010. http://www.biblioteca.pucpr.br/tede/tde_busca/arquivo.php?codArquivo=1830.

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Dissertação (mestrado) - Pontifícia Universidade Católica do Paraná, São José dos Pinhais, 2010<br>Inclui bibliografias<br>O trabalho discute um dos principais problemas relacionados aos baixos índices da pecuária nacional, o anestro pós-parto de bovinos de corte. O anestro puerperal nos bovinos ocorre em função de uma série de variáveis, sendo os aspectos ligados à nutrição<br>The work aimed discusses the mains problems associated to the low fertility rates of national livestock, being post partum anestrus in beef cattle. The postpartum anestrus in bovines comes from several variables, being

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Nenad, Katanić. "Повезаност особина из перформанс теста назимица са величином легла код крмача". Phd thesis, Univerzitet u Novom Sadu, Poljoprivredni fakultet u Novom Sadu, 2016. https://www.cris.uns.ac.rs/record.jsf?recordId=101699&source=NDLTD&language=en.

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Испитивање повезаности особина из перформанс теста назимица савеличином легла крмача, обављено је на седам генотипова животиња (чистихраса: дански ландрас, холандски ландрас, немачки ландрас, шведски ландрас ивелики јоркшир и програмских мелеза: мелеза чија је мајка ландрас и мелеза чијаје мајка велики јоркшир).Фенотипска повезаност особина из перформанс теста (ектеријер, маса накрају теста, старост на крају теста, дневни прираст у тесту, дебљина сланинеу слабинском делу, дебљина сланине у леђном делу, дубина МЛД-а, број легла,приплодна вредност назимица процењена селекцијским индексом и проце

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Amal, Shah. "Consequences of selection for weaning weight on the bioeconomic efficiency of beef calf production." 1993. http://hdl.handle.net/1993/17496.

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Yen, Ting, and 嚴婷. "Effects of Different Birth Season and Age of Weaning on Body Weight Gain and Blood Constituents of Goat Kids." Thesis, 2006. http://ndltd.ncl.edu.tw/handle/61458449840951787105.

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碩士<br>國立中興大學<br>畜產學系<br>94<br>This study has two purposes: the first is to examine the effect of birth season on growth of goat kids by comparing the feeding intakes, average body weight gain and blood constituents in goat kids born out of birth season using artificial controlled photoperiod mating in anestrus season and those born in birth season during the natural photoperiod. The second is to examine the effect of weaning at the 7th or the 9th week on the average body weight gain and blood constituents of goat kids; then to compare the effect of both different birth season and weaning age t

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Zindove, Titus Jairus. "Effects of within-litter birth weight variation of piglets on performance at three weeks of age and at weaning." Thesis, 2011. http://hdl.handle.net/10413/8738.

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The impact of within-litter weight variation on the productivity of pig enterprises is poorly understood. The objective of the study was to determine the effect of within-litter birth weight variation on litter performance at three weeks of age and at weaning. The study was conducted using records from 1 788 litters, collected between January 1998 and September 2010, from a pig herd at the Agricultural Research Council (ARC), Irene. The records consisted of piglet identity, breed of sow, breed of boar, parity number, date of farrowing, number of piglets born alive (NBA), individual piglet weig

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Peterson, Beau A. "Effects of birth and weaning weight on variation in growth performance parameters and carcass characteristics and composition of pigs /." 2008. http://gateway.proquest.com/openurl?url_ver=Z39.88-2004&rft_val_fmt=info:ofi/fmt:kev:mtx:dissertation&res_dat=xri:pqdiss&rft_dat=xri:pqdiss:3337887.

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Thesis (Ph.D.)--University of Illinois at Urbana-Champaign, 2008.<br>Source: Dissertation Abstracts International, Volume: 69-11, Section: B, page: 6482. Adviser: Mike Ellis. Includes bibliographical references. Available on microfilm from Pro Quest Information and Learning.

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Ndlangamandla, Xolani Nduduzo, and 隋朗尼. "Effects of Weaning Weights on Growth Check Intensity in Weanling Pigs." Thesis, 2017. http://ndltd.ncl.edu.tw/handle/37ku85.

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碩士<br>國立屏東科技大學<br>熱帶農業暨國際合作系<br>105<br>In a bid to achieve food security with the increasing world population, commercial pig producers aim for high lean content or increase number of surviving piglets to slaughter in a farm. The abrupt changes experienced by piglets in the modern weaning practice jeopardise production performance as it leads to growth checks or even death in extreme cases. Post-weaning growth check, caused by reduced or zero feed intake at weaning, is an economic and welfare concern. Following inconsistent conclusions from available literature pertaining effects of weaning we

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Sambo, Johan Mackson. "Evaluation of the Nguni cattle reproductive performance in the communal property association and privately owned enterprises across ecological zones of Mpumalanga Province." Thesis, 2020. http://hdl.handle.net/10386/3431.

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Thesis (M.A. Agricultural Management (Animal Production)) -- University of Limpopo, 2020<br>The Nguni is indigenous multi-purpose cattle breed that plays an important role in both commercial and communal farming systems in South Africa (SA). Unfortunately, the breed is currently under threat of diminishing due to farmers’ preference for exotic breeds and cross breeding. In recognition of the above, the Industrial Development Corporation, the Mpumalanga Department of Agriculture, Rural Development, Land and Environmental Affairs and the University of Limpopo established the Nguni catt

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Ngwekhulu, Livhuwani. "Fiber growth of goats as influenced by the doe's genotype, plane of nutrition and physiological stage (gestation and lactation)." Diss., 2003. http://hdl.handle.net/2263/27373.

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The full text of this thesis/dissertation is not available online. Please <a href="mailto:upetd@up.ac.za">contact us</a> if you need access. Read the abstract in the section 00front of this document.<br>Dissertation (M Inst Agrar (Animal Production))--University of Pretoria, 2006.<br>Animal and Wildlife Sciences<br>unrestricted

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Matabane, Matshidiso Bailekae. "Effect of advanced reproductive technologies on smallholders' pig productivity in Gauteng Province." Thesis, 2018. http://hdl.handle.net/10386/2403.

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Thesis (Ph.D. (Animal Production)) --University of Limpopo, 2018<br>Pigs are of high economic importance, especially among the smallholder pig farmers as they contribute to human nutrition, food security, poverty alleviation, enhanced livelihood and creation of employment for the rural community. However, reproductive inefficiency is the main limiting factor due to inaccessibility to superior germplasm. Therefore, advances in reproductive technologies such as oestrus synchronization and artificial insemination (AI) offers unprecedented opportunities for livestock improvement for smallholder pi

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