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| Dorantes Jiménez, Jaime. |
| Con base en la información productiva y genealógica de la base de datos de la Asociación Mexicana de Criadores de Ganado Suizo de Registro, se realizó un estudio en ganado Suizo Americano en México, cuyos objetivos fueron: estimar y analizar las tendencias genéticas y fenotípicas en producción de leche (Pleche), determinar la existencia de interacción genotipo por ambiente en dos regiones del trópico y estimar parámetros genéticos para características de tipo. Se utilizó un análisis estadístico univariado y bivariado usando la metodología del Modelo Animal con el programa MTDFREML. Los resultados mostraron que la ganancia genética y fenotípica anual en Pleche fue de 4.41±0.24 kg (P<0.05) y 114.93 kg año-1 (P<0.05) en el período 1990-2012. El... |
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Palavras-chave: Suizo Americano; Tendencias genéticas; Interacción; Tipo; Brown Swiss; Genetic trends; Interaction; Type; Ganadería; Doctorado. |
| Ano: 2013 |
URL: http://hdl.handle.net/10521/2167 |
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| Garnero,Analía del Valle; Marcondes,Cintia Righetti; Gunski,Ricardo José; Oliveira,Henrique Nunes de; Lôbo,Raysildo Barbosa. |
| There are few studies on weight covering the full life cycle of Zebu cattle, and there is no entire growth description or mean growth pattern for animals belonging to this breed. In order to provide such data, 1,158 Nelore females born between 1985 and 1995 were weighed 14,563 times from birth to full growth maturity, in ten herds spread over seven Brazilian states. The Von Bertalanffy, Brody, logistic and Gompertz non-linear models were used to obtain the asymptotic weights (A) and the maturation rates (K). The (co)variance and breeding value components for A and K were obtained by using the multiple trait derivative free restricted maximum likelihood method under the animal model. Genetic trends were calculated in function of the mean expected progeny... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Adult weight; Bovine(s); Genetic trends; Maturation rate; Simulation with growth curves. |
| Ano: 2006 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1415-47572006000400012 |
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| Malhado,Carlos Henrique Mendes; Carneiro,Paulo Luiz Souza; Malhado,Ana Claudia Mendes; Martins Filho,Raimundo; Bozzi,Riccardo; Ladle,Richard James. |
| The objective of this work was to evaluate the population structure and the genetic and phenotypic progress of Nelore cattle in Northern Brazil. Pedigree information concerning animals born between 1942 and 2006 were analyzed. Population structure was performed using the Endog program. Out of the 140,628 animals studied, 67.7, 14.52 and 3.18% had complete pedigree record of the first, second and third parental generation, respectively. Inbreeding and average relatedness coefficients were low: 0.2 and 0.13%, respectively. However, these parameters may have been underestimated, since information on pedigree was incomplete. The effective number of founders was 370 and the genetic contribution of 10, 50 and 448 most influent ancestors explained 13.2, 28 and... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Bos taurus indicus; Effective population size; Genetic parameters; Genetic trends; Inbreeding; Pedigree analysis. |
| Ano: 2010 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-204X2010001000009 |
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| Camargo,Ederson Gomes; Marques,Daniele Botelho Diniz; Figueiredo,Elsio Antonio Pereira de; Silva,Fabyano Fonseca e; Lopes,Paulo Sávio. |
| ABSTRACT We aimed to estimate litter size and litter uniformity genetic parameters and genetic trends of Landrace pigs at birth and at three weeks by using multitrait analyses for 2,787 litters. The following litter traits were evaluated: number of piglets born alive (NBA), within-litter weight mean at birth (MBW), within-litter weight standard deviation at birth (SDB), within-litter weight coefficient of variation at birth (CVB), number of piglets at three weeks (NT), within-litter weight mean at three weeks (MT), within-litter weight standard deviation at three weeks (SDT), and within-litter weight coefficient of variation at three weeks (CVT). Heritability estimates for NBA, MBW, SDB, and CVB were 0.09±0.04, 0.31±0.08, 0.01±0.04, and 0.07±0.05,... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Coefficient of variation; Genetic parameters; Genetic trends; Piglet; Variation. |
| Ano: 2020 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-35982020000100402 |
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