Growth curves for ostriches (Struthio camelus) in a Brazilian population

Ramos, Salvador Boccaletti; Caetano, S. L.; Savegnago, Rodrigo Pelicioni; Nunes, Berta; Ramos, A. A.; Munari, Danísio Prado

doi:10.3382/ps.2012-02380

Cited by 15 publications

(7 citation statements)

References 7 publications

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“…Understanding and estimating, the defining characteristics of growth processes are key components of developmental research. Growth curve is an effective tool for biological analysis, investigation and interpretation of growth relationships, Ramos et al (2013). Nonlinear growth curves are essential for capturing these various change components like body weight, inflection point and parameter can easily be calculated by growth curve models, Nahashon et al (2006).…”

Section: Model Parametersmentioning

confidence: 99%

Growth Patterns of Two Chinese Native Goose Breeds

Ibtisham

et al. 2017

Rev. Bras. Cienc. Avic.

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To study the development rules of Chinese native geese, two breeds, Shitou and Sichuan White geese were analyzed from 0 to 12 weeks of age. The growth curves were fitted with commonly used four kinds of nonlinear models (Logistic, Gompertz, Von Bertalanffy and Richards). The results showed that the growth curves were appropriately fitted with all four models but the Logistic and Richards both had the best fitting with growth curve (R 2 >0.99). Analyzing the fitting parameters of the Logistic and Richards, we found that male Shitou had the highest adult body weight while Sichuan White female had the lowest weight. In Shitou breed, Shape parameter Predicted with Richards model was corresponded with Gompertz curve, while in Sichuan breed it was in between Gompertz and Bertalanffy. Growth parameters predicted with Logistic model was much more closed to observed value as compared others. So overall logistic was the best model to analyze the growth curve in Chinese native goose and Shitou goose had excellent growth performance when compared to Sichuan White.

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Section: Model Parametersmentioning

confidence: 99%

Growth Patterns of Two Chinese Native Goose Breeds

Ibtisham

et al. 2017

Rev. Bras. Cienc. Avic.

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“…The equations and parameters for the growth models applied are given in Supplemental Table S1. The non-linear modeling was carried out using the NLS procedures by the Gauss-Newton algorithm [12]. The goodness-of-fit of the functions was assessed based on the coefficient of determination (R 2 ).…”

Section: Discussionmentioning

confidence: 99%

Age- and Sex-Related Changes in Body Weight, Muscle, and Tibia in Growing Chinese Domestic Geese (Anser domesticus)

Yang

et al. 2022

Agriculture

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This study evaluated the changes in body weight (BW), muscle mass, and tibial parameters of growing domestic geese from hatching to 63 days. A total of 256 Jiangnan White geese (128 males and 128 females) were assigned to 16 pens (8 pens of males and 8 pens of females) and fed with the same diet until the age of 63 d. Geese were weighed at hatch and then at 7-d intervals by pen, and then sixteen birds (8 males and 8 females) were selected for measuring breast and leg muscle weights and tibial characteristics. The BW of goslings increased with age throughout the whole study, with males being significantly heavier than females after 28 d. The breast muscle (pectoral major and minor) weight increased slowly before 42 d and then increased rapidly after 42 d regardless of the sex of goslings. At 42 d, the breast muscle weight of males was significantly lower than that of females. Goose leg muscle (thigh and drumstick) weight increased slowly from 0 to 14 d, rapidly from 15 to 49 d, and almost flat from 50 to 63 d. At 63 d, the leg muscle weight of males was higher than that of females. The leg muscle of goslings grew synchronously with their BW, while the growth of the breast muscle lagged behind the leg muscle and BW. The tibia length and width increased with age, especially from hatching to 35 d and then remained with little change from 35 d onward. The fat-free weight and breaking strength of the tibia significantly increased with age, especially from 0 to 49 d. The tibia ash content of goslings increased rapidly before 28 d and gradually flattened after 28 d. During the growth of the tibia, changes in ash were considerably more advanced, followed by morphology and finally by fat-free weight and breaking strength. In summary, the BW, muscle mass, and tibial parameters of goslings showed sex differences after 28 d. After hatching, geese rapidly grew leg muscle and tibia to support their increased BW and movement.

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“…where Ut is the maturity degree (%), Yt is the weight (kg) of the ostrich at 90, 180, and 400 days, and A is the asymptotic weight. The Gompertz function was chosen because of its economy of parameters and ability to describe relative growth rate as a simple function of size (Ramos et al, 2013); it has been used in other studies to evaluate ostrich growth (Niemann, Brand, & Hoffman, 2018). In addition, the function offers the possibility of describing continuous growth, sigmoid forms, asymptotes, inflection points, and parameters with biological interpretations.…”

Section: Datamentioning

confidence: 99%

Kleiber ratios and growth curves of African Black and Red Neck ostrich breeds and their crossbreeds

Rezende¹,

Carneiro²,

Moretti³

et al. 2021

Semina: Ciênc. Agrár.

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The selection of animals with lower production costs can be achieved by using feed efficiency and growth curve information. Kleiber ratio (KR) is an alternative option for discriminating against the animals that have the greatest weight gain about their final weight. Alternative feed efficiency and growth curves for ostriches of the African Black (AB) and Red Neck (RN) breeds and their crossbreeds (CB) were investigated using KR and Gompertz equation. Univariate and multivariate analyses were used. The highest adult weight was identified in the RN and CB. AB was more precocious than the RN and CB individuals. Only AB animals reached 75% of their mature weight at one year of age. At 180 days, AB showed better KR. AB was different from the others, mainly for KR at 90 days and 180 days. Considering multivariate analysis, AB animals were different from the others, regardless of sex, mainly for KR at 90 days and KR at 180 days. Other subgroups separated the animals by sex. In a market preferring animals of minor structure (smaller cuts) and greater precocity, it would be suitable to opt for AB. When animals with greater body structure (larger cuts) are desired, males RN and CR is the best option, however, it will be slaughtered with greater age and lower value for KR (may generate a bigger production cost ). It is possible to obtain animals with precocity and high KR, being well represented by the AB breed.

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Growth curves for ostriches (Struthio camelus) in a Brazilian population

Cited by 15 publications

References 7 publications

Growth Patterns of Two Chinese Native Goose Breeds

Growth Patterns of Two Chinese Native Goose Breeds

Age- and Sex-Related Changes in Body Weight, Muscle, and Tibia in Growing Chinese Domestic Geese (Anser domesticus)

Kleiber ratios and growth curves of African Black and Red Neck ostrich breeds and their crossbreeds

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