Consulta: subjectFacets:"Reproductive traits"
Registros recuperados: 13
Data/hora: 06/06/2024 00:43:34

Atributos demográficos y biología reproductiva de Coryphantha cornifera y Stenocactus anfractuosus con fines de conservación.
Provedor de dados: 32
Autores: Fuentes Mayo, Vladimir.
Se estudió la distribución geográfica, asociación, densidad, supervivencia in situ y factores de riesgo para las poblaciones de Coryphantha cornifera y Stenocactus anfractuosus. La búsqueda de las especies se hizo mediante recorridos de campo en los estados de México, Hidalgo, Tlaxcala, Puebla y Querétaro. En los sitios donde se encontraron estas especies, se registraron las coordenadas geográficas y altitud. Se establecieron parcelas de 400 m2 donde se marcaron todos los individuos presentes; para cada uno se obtuvieron datos morfométricos y número de costillas o tubérculos; también se registró la ocupación del hábitat, el estado fenológico y la condición sanitaria. Las plantas fueron censadas cada tres meses. C. cornifera y S. anfractuosus se encontraron...
Palavras-chave: Distribución geográfica; Densidad; Riesgo; Cactáceas; Doctorado; Botánica; Globose cacti; Mexico; Reproductive traits; Mating systems; Doctorado; Botánica.
Ano: 2012
URL: http://hdl.handle.net/10521/734

Polymorphisms on SSC15q21-q26 Containing QTL for reproduction in Swine and its association with litter size
Provedor de dados: 74
Autores: Du,Hongli; Chen,Jing; Cui,Jianxun; Wang,Xiaoning; Zhang,Xiquan.
Several quantitative trait loci (QTL) for important reproductive traits (ovulation rate) have been identified on the porcine chromosome 15 (SSC15). To assist in the selection of positional candidate swine genes for these QTL on SSC15, twenty-one genes had already been assigned to SSC15 in a previous study in our lab, by using the radiation hybrid panel IMpRH. Further polymorphism studies were carried out on these positional candidate genes with four breeds of pigs (Duroc, Erhualian, Dahuabai and Landrace) harboring significant differences in reproduction traits. A total of nineteen polymorphisms were found in 21 genes. Among these, seven in six genes were used for association studies, whereby NRP2 polymorphism was found to be significantly (p &lt; 0.05)...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Porcine; Reproductive traits; NRP2; Candidate gene.
Ano: 2009
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1415-47572009000100010

Bayesian inference on field data for genetic parameters for some reproductive and related traits of Nellore cattle (Bos indicus)
Provedor de dados: 74
Autores: Faria,Carina Ubirajara de; Magnabosco,Cláudio de Ulhôa; Reyes,Arcadio de los; Lôbo,Raysildo Barbosa; Bezerra,Luiz Antônio Framartino; Sainz,Roberto Daniel.
We used Gibbs sampling in single and two-trait animal models to estimate genetic parameters for some reproductive and related traits of Nellore cattle (Bos indicus). Female traits were age at first calving (AFC), cumulative productivity (CP) and adult weight (AW). For males, scrotal circumferences at 365 and 450 days of age were analyzed. Gibbs sampling using the ‘Multiple Trait using Gibbs Sampling under Animal Model’ (MTGSAM) program of Van Tassel and Van Vleck was used to estimate the (co)variance components of the traits and conduct genetic analyses. Heritabilities were AFC = 0.26, AW = 0.36 and CP = 0.25 under the single-trait animal model. The mean, mode and median estimates for genetic parameters obtained from the marginal posterior distributions...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Bayesian inference; Genetic parameters; Heritabilities; Nellore cattle; Reproductive traits.
Ano: 2007
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1415-47572007000300008

A novel index based on planktonic copepod reproductive traits as a tool for marine ecotoxicology studies
Provedor de dados: 5
Autores: Hussain, Mohamed Bakr; Laabir, Mohamed; Yahia, Mohamed Nejib Daly.
Copepods are excellent bioindicators of climate change and ecosystem pollution in anthropized coastal waters. This work reviewed the results of previous studies examining changes in egg production rate (EPR), hatching success (HS), and nauplius survival rate (NSR) in natural conditions and in the presence of pollutants, including heavy metals and organic contaminants such as polycyclic aromatic hydrocarbons (PAHs) and persistent organic pollutants (POPs). At high concentrations, cadmium and silver induce an increase in EPR in the copepods Acartia tonsa and Acartia hudsonica, while exposure to mercury decreases EPR in adults by 50%. All three metals affect HS, with mercury inducing a stronger effect than cadmium and silver. Cadmium affects reproductive...
Tipo: Text
Palavras-chave: Planktonic copepods; Reproductive traits; Ecotoxicology.
Ano: 2020
URL: https://archimer.ifremer.fr/doc/00623/73498/72789.pdf

Modeling reproductive traits of an invasive bivalve species under contrasting climate scenarios from 1960 to 2100
Provedor de dados: 5
Autores: Gourault, Melaine; Petton, Sebastien; Thomas, Yoann; Pecquerie, Laure; Marques, Goncalo M.; Cassou, Christophe; Fleury, Elodie; Paulet, Yves-marie; Pouvreau, Stephane.
Identifying the drivers that control the reproductive success of a population is vital to forecasting the consequences of climate change in terms of distribution shift and population dynamics. In the present study, we aimed to improve our understanding of the environmental conditions that allowed the colonization of the Pacific oyster, Crassostrea gigas, in the Bay of Brest since its introduction in the 1960s. We also aimed to evaluate the potential consequences of future climate change on its reproductive success and further expansion. Three reproductive traits were defined to study the success of the reproduction: the spawning occurrence, synchronicity among individuals and individual fecundity. We simulated these traits by applying an individual-based...
Tipo: Text
Palavras-chave: DEB model; IPCC scenarios; Reproductive traits; Crassostrea gigas; Bay of Brest.
Ano: 2019
URL: https://archimer.ifremer.fr/doc/00440/55188/56794.pdf

Reproductive system and spermatozoa ultrastructure support the phylogenetic proximity of Megadasys and Crasiella (Gastrotricha, Macrodasyida)
Provedor de dados: 16
Autores: Guidi, L.; Todaro, M.A.; Ferraguti, M.; Balsamo, M.
The reproductive system and the spermatozoon of Megadasys sterreri from Lanzarote (Canary Islands, Spain) were studied at structural and ultrastructural levels. The species is a simultaneous hermaphrodite with cross-fertilization and shows paired gonads, the male anterior and the female posterior, and both gametes mature in a caudo-cephalic direction. Sperm ducts converge on the midline and open into a ventral common pore. Two sexual accessory organs are present in the caudal trunk. A pipe-like frontal organ lies between the ovaries and the caudal organ, and is composed of a long, thin region connected to a large zone containing mature and degenerating spermatozoa. The cigar-like caudal organ is elongate, bulky and is made of an anterior glandulo-muscular...
Tipo: Article / Letter to the editor
Palavras-chave: Cephalodasyidae; Phylogeny; Planodasyidae; Reproductive traits; Spermatogenesis; 42.79; 42.62.
Ano: 2014
URL: http://www.repository.naturalis.nl/record/471589

Selection for reproductive traits in white egg stock using independent culling levels
Provedor de dados: 89
Autores: Schmidt,GS; Figueiredo,EAP.
The objective of this study was to report the response to selection for fertility and hatchability in white egg layers strains, based on sire and dam performance, and the effects of inbreeding on these traits. Two selected white egg strains (CC and DD) from Embrapa´s poultry program under multiple trait selection were compared to a control strain (CCc). The control strain was established by randomly mating one male from each sire family to a non-related female from each dam family and was used to monitor genetic change in the selected lines. CC and DD were selected using family and individual information on hen-day egg production up to 40 weeks of age, egg weight, sexual maturity and 16-week-old body weight over five generations. Independent culling levels...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Egg production; Inbreeding; Reproductive traits; Selection culling levels.
Ano: 2005
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-635X2005000400006

Latitudinal disparity in the reproductive cycle of sharpnose shark, Rhizoprionodon lalandii (Elasmobranchii: Carcharhinidae), in Atlantic waters off South America
Provedor de dados: 103
Autores: Macedo,Morgana M.; Sousa,Marcia F.; Batista,Vandick S.
Geographical variation in biophysical conditions may strongly influence the life history characteristics of widely distributed species, such as the Brazilian sharpnose shark, Rhizoprionodon lalandii (Müller &amp;amp; Henle, 1839). Here, we use original and secondary data of reproductive traits of R. lalandii to identify population differences among northern/northeastern and southern Atlantic waters of South America. In the southeast region, birth occurs between December and March, and the young become frequent along the coast between April and September. Mating occurs mainly between March and June, when females with bite marks are common. Females in early pregnancy occur between March and September. The reproductive cycle of R. lalandii in the...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Coastal waters; Life history; Reproductive traits; Northeastern Brazil.
Ano: 2012
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1984-46702012000500004

Effectiveness of a low-dose Norgestomet ear implant in short-term protocols to induce estrus in ewes during the non-breeding season in Brazil.
Provedor de dados: 96
Autores: Lima Júnior,Dayrton Farias; Barreto,José Victor Pronievicz; Sterza,Fabiana de Andrade Melo; Souza-Cáceres,Mirela Brochado; Pontes,Vanessa Pereira; Zundt,Marilice; Castilho,Caliê; Cunha Filho,Luiz Fernando Coelho da.
ABSTRACT The objective of this study was to evaluate the reproductive performance of ewes subjected to a short-term protocol for estrus induction using 1 mg of Norgestomet during the non-breeding season in Brazil. A total of 84 ewes were randomly divided into two equal groups (n = 42 per group). Controlled Internal Drug Release (CIDR) containing 330 mg progesterone was inserted into the vagina in the first 42 ewes, and for the other 42 ewes in the second group, 1 mg of Norgestomet was placed subcutaneously in the convex surface of the ear. Implants and devices were removed in both groups on day 6. Following the removal of implants and devices, 10 mg of PGF2α and 300 IU of eCG were injected in all the ewes. After 48 h of application, three fertile rams were...
Tipo: Info:eu-repo/semantics/other
Palavras-chave: Animal breeding; Ovine; Progesterone; Reproductive traits; Sheep; Synchronization of estrus.
Ano: 2019
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-35982019000100603

Additional feeding during late gestation improves initial litter weight of lactating sows exposed to high ambient temperature
Provedor de dados: 96
Autores: Choi,Yo Han; Hosseindoust,Abdolreza; Kim,Min Ju; Kim,Kwang Yeol; Lee,Jun Hyung; Kim,Young Hwa; Kim,Jin Soo; Chae,Byung Jo.
ABSTRACT The present study investigated the impacts of additional feeding (AF; containing 16% excess feed than control diet in the last two weeks of gestation) during late gestation period and different backfat thickness (BFT) including low (&lt;20 mm) and high (≥20 mm) backfat on reproductive performance, litter size, blood metabolites, hormonal profiles, colostrum, and milk composition of sows from day 90 of gestation to farrowing, and from farrowing to weaning during summer (average 28.3 °C). Fifty-four crossbred sows (Yorkshire × Landrace) were allotted to one of four treatments according to a 2×2 factorial arrangement. There was no AF×BFT interaction for any of the measured variables. The body weight change of sows was decreased for &lt;20 mm in BFT...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Backfat thickness; Gestating sows; Heat stress; Reproductive traits.
Ano: 2019
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-35982019000100522

Study of relations among age at first calving, average weight gains and weights from weaning to maturity in Nellore cattle
Provedor de dados: 96
Autores: Boligon,Arione Augusti; Albuquerque,Lucia Galvão de; Mercadante,Maria Eugênia Zerlotti; Lôbo,Raysildo Barbosa.
Data from 23,120 Nellore animals were used to estimate genetic parameters for age at first calving, average gains from weaning to yearling and from yearling to after yearling, weaning weight, yearling weight, after yearling weight and weight at 2 and 5 years of age. Animal models were fitted by Restricted Maximum likelihood Method. Estimate heritability for age at first calving, weaning to yearling weight gain, yearling to after yearling weight gain, weight at weaning, yearling weight, after yearling weight and weight from 2 to 5 years of age were 0.17 ± 0.01; 0.23 ± 0.03; 0.25 ± 0.03; 0.28 ± 0.02; 0.26 ± 0.03; 0.30 ± 0.03; 0.32 ± 0.02 and 0.36 ± 0.04, respectively. The genetic correlation estimates between age at first calving and weight traits ranged...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Beef cattle; Genetic parameters; Heritability; Productive; Reproductive traits.
Ano: 2010
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-35982010000400007

Estimation of variance components, genetic parameters and genetic trends for litter size of swines
Provedor de dados: 96
Autores: Barbosa,Leandro; Lopes,Paulo Sávio; Regazzi,Adair José; Torres,Robledo de Almeida; Santana Júnior,Mário Luiz; Veroneze,Renata.
Records of Large White breed animals were used to estimate variance components, genetic parameters and trends for the character total number of born piglets (TNBP) as measure of litter size. For obtaining variance components and genetic parameters, it was used the Restricted Maximum Likelihood Method using MTDFREML software. Two mixed models (additive and repeatability) were evaluated. The additive model contained fixed effect of the contemporary group and the following random effects: direct additive genetic and residual effect for the first parturition. Repeatability model had the same effects of the additive model plus parturition order fixed effect and non-correlated animal permanent environment random effect for the second, third and forth...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Genetic trend; Heritability; Number of piglets; REML; Repeatability model; Reproductive traits.
Ano: 2010
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-35982010001000008

Ecology of Mabuya agilis (Raddi) (Lacertilia, Scincidae) at the restinga of Grumari, Rio de Janeiro, southeastern Brazil
Provedor de dados: 104
Autores: Vrcibradic,Davor; Rocha,Carlos Frederico Duarte.
Some aspects of the ecology of the skink Mabuya agilis (Raddi, 1823) at the restinga habitat of Grumari, in Rio de Janeiro, Brazil are studied. Most of the lizards were first sighted on the ground, though a few were using perches (mainly cacti) up to 30 cm high. Mean body temperature in activity was 33.1 ± 2.4ºC and was significantly correlated to air temperature. There was sexual dimorphism in size (snout-vent length - SVL), with females growing larger than males. Frequency of broken tails was high overall (83%) and did not differ between sexes. Females and males are sexually mature at 49 mm and 47 mm SVL, respectively. Brood size averaged 3.2 ± 1.0 (range 1-5) and was positively and significantly related to female SVL (r = 0.65, p = 0.001). Relative...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Mabuya agilis; Lizard; Thermal ecology; Diet; Reproductive traits; Restinga habitat; Southeastern Brazil.
Ano: 2002
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0101-81752002000600002