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| Registros recuperados: 10 | |
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| Lusk, Jayson L.. |
| Recent research has identified genetic diversity in the ability of animals to manufacture and recognize leptin, a protein that regulated appetite and weight. This paper determines the economic value of using information on leptin genotype to select and manage beef cattle. Results reveal that the economic value of using genotypic information to sort cattle by optimal endpoint is only about $2/head for steers and $1/head for heifers; however, the value of using genotypic information to optimally select and feed only certain genotypes is $23/head for steers and $28/head for heifers. The difference in per head profit between the best and worst performing genotype is over $28 on the date the cattle were actually marketed and increases to $60 if each genotype is... |
| Tipo: Journal Article |
Palavras-chave: Cattle marketing; Days on feed; Genetics; Growth models; Leptin; Value of information; Livestock Production/Industries. |
| Ano: 2007 |
URL: http://purl.umn.edu/8641 |
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| Sogut,B; Celik,S; Ayasan,T; Inci,H. |
| ABSTRACT The objective of this study was to identify the growth curve of live weight of turkeys reared in different systems (intensive and free- range) with the best mathematical model. To achieve this goal, the live weight of male and female turkeys (Large White) reared for 0-18 weeks were used. Logistic, Gompertz, Von Bertalanffy, and Gauss were used to determine the best model for the turkeys. In comparison of the models, values of Coefficient of Determination (R2), Mean Squares of Error (MSE) and Model Efficiency (ME) were used. In Von Bertalanffy model, the coefficient of determinations for males and females were found as 0.9974 and 0.99915 in intensive system and 0.9794 and 0.9804 in Free-Range system, respectively. As a result of this study, because... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Breeding system; Growth models; Large white turkey; Live weight. |
| Ano: 2016 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-635X2016000400619 |
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| Kleinpaul,Jéssica A.; Cargnelutti Filho,Alberto; Carini,Fernanda; Pezzini,Rafael V.; Chaves,Gabriela G.; Thomasi,Rosana M.. |
| ABSTRACT This study aimed to adjust the Gompertz and Logistic nonlinear models for the fresh and dry matter of aerial part and indicate the model that best describes the growth of two rye cultivars in five sowing seasons, as well as to characterize the growth of the cultivars regarding the fresh and dry matter of aerial part. Ten uniformity trials were conducted with the rye crop in 2016. A weekly sampling and evaluation of 10 plants per trial was performed from the time the plants presented one expanded leaf. For each plant, the fresh and dry matter of aerial part were weighed. The Gompertz and Logistic models were adjusted to the accumulated thermal time based on the measures of each trait in each assessment. Also the parameters a, b, and c for each... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Secale cereale; Growth models; Nonlinear models; Soil cover plant. |
| Ano: 2019 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1415-43662019001200937 |
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| Ribeiro,Thais Destefani; Mattos,Ricardo Wagner Pacopahyba de; Morais,Augusto Ramalho de; Muniz,Joel Augusto. |
| Abstract Pequi tree is a species native to the Brazilian cerrado, with wide geographic distribution, whose fruit is very appreciated in cooking, composing traditional dishes. In general, pequi fruit is consumed when ripe in the fresh form or in the various derived products such as oils, liqueurs, sweets, ice creams among others, involving important socioeconomic activity generating employment and income in family agriculture. The aim of this study was to evaluate the adjustment of Brody, Gompertz, Logistic and Von Bertalanffy models in the growth and development of pequi fruits based on their physical characteristics such as longitudinal and cross-sectional diameter and fresh mass obtained over time. Parameters were estimated using R software routines,... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Growth models; Biometric measurements; Sigmoid curves; Adjustment of models; Pequi. |
| Ano: 2018 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-29452018000400705 |
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| ACERO-CAMELO,Amanda; MOLINA,Esteban; PARRA-CORONADO,Alfonso; FISCHER,Gerhard; CARULLA-FORNAGUERA,Juan Evangelista. |
| ABSTRACT In order to estimate the base temperature (Bt) of growth through the appearance of leaves and calculate the phyllochron for kikuyu grass, three plots were established on three farms in the Provincia of Ubaté (Cundinamarca, Colombia) located at different altitudes (2560, 2640, 3143 m. a. s. l.). Measurements were made in four cycles in a period of eight months. The Bt was estimated by the least coefficient of variation method using a second order regression model and the model obtained was validated by the cross-validation method. The Bt values for the first, second, third and fourth leafwere 4.02, 3.68, 3.93, and 3.62 °C, respectively. For the appearance of the first leaf, the kikuyu required more thermal time (TT) (97.5 accumulated growing degree... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Growth models; Leaf appearance rate; Pennisetum clandestinum; Tropical forage. |
| Ano: 2021 |
URL: http://www.scielo.org.co/scielo.php?script=sci_arttext&pid=S0120-548X2021000200160 |
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| Sousa,Iábita Fabiana; Kunzle Neto,Johan Eugen; Muniz,Joel Augusto; Guimarães,Renato Mendes; Savian,Taciana Villela; Muniz,Fabiana Rezende. |
| Cumulative germination of coffee has a longitudinal behavior mathematically characterized by a sigmoidal model. In the seed germination evaluation, the study of the germination curve may contribute to better understanding of this process. The aim of this study was to evaluate the goodness of fit of Logistic and Gompertz models, with independent and first-order autoregressive errors structure, AR (1), in the description of coffee (Coffea arabica L.) line Catuai vermelho IAC 99 germination, at five different potential germination. The data used were from an experiment conducted in 2011 at the Seed Analysis Laboratory of the Federal University of Lavras. The Logistic and Gompertz nonlinear models were appropriately adjusted to the percentage germination data.... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Growth models; Autocorrelated errors; Nonlinear regression; Germination potential; Regression and correlation. |
| Ano: 2014 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-84782014001102016 |
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| Registros recuperados: 10 | |
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