Estudo da curva de crescimento de ovinos Santa Inês

Sarmento, José Lindenberg Rocha; Regazzi, Adair José; Sousa, Wandrick Hauss de; Torres, Robledo de Almeida; Breda, Fernanda Cristina; Menezes, G. R. de O.

doi:10.1590/s1516-35982006000200014

Cited by 100 publications

(100 citation statements)

References 8 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…En ovinos de la raza Santa Inés, Sarmento et al (2006) informaron que, la curva de crecimiento antes de la pubertad fue lineal y con crecimiento acelerado, el punto de inflexión fue la pubertad, después de ello se desaceleró. Lo que tal vez se puede asimilar en el presente trabajo para altura a la grupa y alzada a la cruz, que corresponde al periodo entre los 3 y 5 meses de edad (Figura 2 y Figura 3), donde se observó el máximo crecimiento.…”

Section: Discussionunclassified

Evaluación del desarrollo testicular y medidas morfométricas en ovinos de pelo colombiano

2018

View full text Add to dashboard Cite

The sheep body measurements are useful indicators of type and function that allow improving the selection. Biometric studies have shown in sheep a relationship between these measures with some productive variables. The main purpose of this study was to evaluate the testicular development and their relationship with morphometric parameters on Colombian hairy sheep of Sampués, Sucre, Colombia. Weaned males (n=12) born between February and April of 2014 were used, and the following measures were taken every twenty-eight days: scrotal circumference (CS), body weight (PC), rump height (AG), withers height (AC), and right and left testicular length (LTD and LTL).The sheep were between three to twelve months old. A multiple regression analysis (RA) was done from PC; AG; AC; TL. To describe the variation of LT, the model included only the variables PC; AG; AC. The grade of association between the studied variables was performed by a Pearson correlation. Scrotal circumference showed a high correlation with the evaluated morphometric parameters. In the RA analysis, the PC influenced the variable CE (p<0.05), while other variables did not have a significant influence. According to the regression coefficient associated to the measurement, per each kg of PC that an animal gained in weight, there was a corresponding increase of 0,09 cm in the CS.

show abstract

Section: Discussionunclassified

Evaluación del desarrollo testicular y medidas morfométricas en ovinos de pelo colombiano

2018

View full text Add to dashboard Cite

show abstract

“…Essas curvas relacionam o peso do animal, com a idade, e utilizam modelos não lineares para condensar grande volume de informação em pequeno conjunto de parâmetros que podem ser interpretados biologicamente (TEIXEIRA et al, 2011). O ajuste de funções de crescimento é uma ferramenta fundamental no planejamento da produção animal, pois permite obter informações precisas sobre ganho de peso dos animais, além de informações de prognósticos futuros para animais do mesmo grupo racial sob a mesma situação ambiental (SARMENTO et al, 2006). A diversidade genética e variabilidade ambiental podem resultar em diferentes curvas de crescimento para uma mesma espécie de animal.…”

Section: Introductionunclassified

Curvas de crescimento de cordeiros da raça Ile de France criados em confinamento

Falcão

Pedrosa

Moreira

et al. 2015

Rev. bras. saúde prod. anim.

View full text Add to dashboard Cite

SUMMARYThe objective of this study was to evaluate the nonlinear models that best describe the growth curve of ram lambs Ile de France created in intensive system in the state of Paraná. Therefore, there were weighed fortnightly during the period from February 2013 to June 2013, from birth to slaughter (120 days) of 31 Ile de France ram lambs. Growth curves were obtained by nonlinear models Brody, Von Bertalanffy, Gompertz and Logistic in which parameters were considered maturation rate (K), asymptotic weight (A), age of the animal (t) is given by integration determining the proportion of growth after birth (B) and the proportion of asymptotic value at which the inflection point occurs curve (m) in accordance with the adopted model. The parameters were estimated by Marquardt applied to the NLIN procedure of SAS statistical program and the criteria used to verify the accuracy of the fit of the curves were the mean square of the coefficient of determination. The Brody, Von Bertalanffy, Gompertz and Logistic resulted respectively in 26. 4579; 26.1668; 26.136; 26.1582 for the mean square and 0.813; 0.958; 0.958; 0.958 for the coefficient of determination. Considering the criteria assumed the Gompertz model, followed by Logistic and Von Bertalanffy, presented the best fit to describe the growth of Ile de France ram lambs.

show abstract

“…According to studies by Sarmento et al (2006), the absolute rate of growth is the gain in weight per unit of time. When time is expressed in days, this represents the average daily weight gain estimated for the growth trajectory, i.e.…”

Section: Methodsmentioning

confidence: 99%

Use of mathematical models in the study of bodily growth in GIFT strain Nile tilapia

Amâncio¹,

Silva²,

Fernandes³

et al. 2014

Rev. Ciênc. Agron.

View full text Add to dashboard Cite

-The objective of this study was to evaluate the accuracy of five mathematical models (Gompertz, Logistic, Linear Hyperbolic, Quadratic and Quadratic Logarithmic) to describe the growth curve of GIFT strain Nile tilapia, Oreochromis niloticus, and to characterize the growth trajectory of body parts. To do this, 1,000 fingerlings, with an initial weight of 2.4 g were placed into 20 brick tanks of 2 m 3 each, at a density of 25 fish m -3, for 180 days. The animals were fed daily, using the protein levels and number of meals appropriate to each stage. Every two weeks 20 fish were randomly sampled, submitted to a fasting period of 48 h and then slaughtered by thermal shock, in order to determine the weight of the whole fish, the skin without scales, skinless fillets, heart, liver, gills and gastrointestinal tract. The Gompertz and Logistic models presented the best fit to the growth curve for live weight, fillet and skin, however the Logistic model underestimated the asymptotic weights. Therefore, to describe the growth curve in GIFT strain Nile tilapia, the Gompertz model is suggested. According to the parameters estimated by the Gompertz model, Nile tilapia reach the age for maximum growth of the fillet and skin before that of body weight. Among the organs studied, growth of the gastrointestinal tract and gills takes place earlier than that of the heart and liver.Key words: Oreochromis niloticus. Growth curve. Gompertz. Growth rate.RESUMO -Objetivou-se com o presente estudo avaliar a acurácia de cinco modelos matemáticos (Gompertz, Logístico, Linear Hiperbólico, Quadrático e Quadrático Logarítmico) para descrever a curva de crescimento de tilápia nilótica Oreochromis niloticus da linhagem GIFT e, realizar a caracterização da trajetória do crescimento das partes corporais. Para tal, 1.000 alevinos com peso inicial de 2,4 g foram estocados em 20 tanques de alvenaria de 2 m 3 numa densidade de 25 peixes m -3 , por um período de 180 dias. Os animais foram alimentados diariamente, utilizando níveis de proteína e número de refeições diárias de acordo com cada fase. Quinzenalmente, foram amostrados aleatoriamente 20 peixes, submetidos a um jejum de 48 h e abatidos por choque térmico, para determinação dos pesos do peixe inteiro, peles sem escamas, filés sem pele, coração, fígado, brânquias e trato gastrointestinal. Os modelos Gompertz e Logístico foram os que mais se adequaram ao ajuste da curva de crescimento do peso vivo, do filé e da pele, todavia, o Logístico subestimou os pesos assintóticos. Desta forma, sugere-se o Gompertz para descrever a curva de crescimento de tilápia nilótica da linhagem GIFT. De acordo com os parâmetros estimados pelo modelo Gompertz, a tilápia nilótica atinge a idade de máximo crescimento do filé e pele antes da idade do peso vivo. Dentre os órgãos estudados, o crescimento do trato gastrointestinal e brânquias é mais precoce do que o do coração e fígado. Palavras-chave:Oreochromis niloticus. Curva de crescimento. Gompertz. Taxa de crescimento. *Autor para correspondência 1 Recebido ...

show abstract

Estudo da curva de crescimento de ovinos Santa Inês

Cited by 100 publications

References 8 publications

Evaluación del desarrollo testicular y medidas morfométricas en ovinos de pelo colombiano

Evaluación del desarrollo testicular y medidas morfométricas en ovinos de pelo colombiano

Curvas de crescimento de cordeiros da raça Ile de France criados em confinamento

Use of mathematical models in the study of bodily growth in GIFT strain Nile tilapia

Contact Info

Product

Resources

About