Aplicação de modelos não-lineares para descrever a evolução de características de crescimento e carcaça em bovinos da raça Hereford

Espigolan, Rafael; Baldi, Fernando; Boligon, Arione Augusti; Banchero, Georgget; Brito, G.; Manna, Alejandro La; Montossi, F.; Fernandez, E.; Albuquerque, Lúcia Galvão de

doi:10.1590/s0103-84782013005000011

Cited by 7 publications

(5 citation statements)

References 8 publications

(3 reference statements)

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“…Several models have been proposed for modeling growth curves, such as Logistic, Gompertz, Von Bertalanffy, Richards and Weibull (RATKOWSKY, 1983;ESPIGOLAN et al, 2013). In many cases these models have their specifi c functional form according to the treated problem, related to some mechanism inherent to the specifi c process.…”

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confidence: 99%

Fitting nonlinear autoregressive models to describe coffee seed germination

Sousa

Neto

Muniz³

et al. 2014

Cienc. Rural

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confidence: 99%

Fitting nonlinear autoregressive models to describe coffee seed germination

Sousa

Neto

Muniz³

et al. 2014

Cienc. Rural

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“…Bones tend to develop earlier in the animal's life than muscles, especially when linear growth is considered (Guilbert and Gregory, 1952;Berg and Butterfield, 1976). Espigolan et al (2013), studying Hereford bulls, showed that hip height grows until 18 months, but body weight is still increasing at this age. The same behavior was observed by Coutinho et al (2015) in Nellore cattle around 17 months.…”

Section: Discussionmentioning

confidence: 99%

Alternative adjustment of scrotal circumference for growth traits in Nellore cattle

Nascimento

Silva

Carvalheiro

et al. 2020

Revista Brasileira De Zootecnia

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The objective of this study was to estimate adjustment factors of scrotal circumference for growth traits in Nellore cattle. Measurement at post-yearling of scrotal circumference from 100,107 Nellore was adjusted for six traits: age (A), body weight (BW), hip height (HH), conformation (C), precocity (P), musculature (M), and simultaneously for age and the other five traits (A-BW, A-HH, A-C, A-P, AM), body weight and the other four traits (BW-HH, BW-C, BW-P, BW-M), and hip height and the other three traits (HH-C, HH-P, HH-M). Standard values were 500 days, 300 kg, 135 cm, and 3, for age, body weight, hip height, and visual scores, respectively. Amplitudes of adjustment factor of scrotal circumference for age, body weight, and hip height were 0.6028, 0.4869, and 0.1572, respectively. Scrotal circumference is expected to grow, on average, 8.71 cm per 100 days of age, 6.51 cm per 100 kg of body weight, and 4.81 cm per 10 cm of hip height. The results showed higher amplitude in the adjustment factor of scrotal circumference for age and body weight (0.3429) compared with age and hip height and body weight and hip height (0.1271 and 0.0443, respectively). The amplitude observed in adjustment factor of scrotal circumference for conformation, precocity, and musculature were 0.1328, 0.1175, and 0.1160, respectively. Considering different adjustment factors of scrotal circumference can be useful for identifying better selection criteria for growth and/or sexual precocity in Nellore.

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“…Growth traits have a direct relationship with the productive life of animals ( Araújo et al, 2012 ; Espigolan et al, 2013 ; Bahashwan et al, 2015 ). Therefore, they have been long recognized as important to all animal scientists, regardless of specialization, who are concerned with the effects of their research and recommendations on lifetime production efficiency ( Fitzhugh, 1976 ).…”

Section: Discussionmentioning

confidence: 99%

Crossbreeding effects on growth and efficiency in beef cow–calf systems: evaluation of Angus, Caracu, Hereford and Nelore breed direct, maternal and heterosis effects

Mendonça

MacNeil

Leal

et al. 2019

Translational Animal Science

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The objective of this study was to determine breed additive and heterosis effects on growth curves, total milk yield (TMY), calf weaning weight (WW), predicted energy intake (EI), and cow efficiency (CE) of purebred and crossbred beef cows raised in Southern Brazil. The data were from 175 purebred and crossbred cows representing eight genetic groups: Angus (A), Hereford (H), Nelore (N), A × H (AH), H × A (HA), A × N (AN), N × A (NA), and Caracu (C) × A (CA). Growth of the cows was modeled using the nonlinear Brody function and machine milking was used to assess TMY. WW was linearly adjusted to 210 d. EI was predicted with an equation in which the independent variables were estimates of parameters of the Brody function and TMY. The ratio of WW to EI estimated CE. Taurine–indicine heterosis effects were significant for all traits, and greater than those for taurine breed crosses. In general, crossbred cows were heavier at maturity, matured earlier, produced more milk, weaned heavier calves, and were predicted to consume more energy. Thus, they were more efficient than purebred cows, despite their greater predicted feed intake. Among the purebreds, A cows matured most rapidly, weighed the least at maturity, produced the most milk, weaned the heaviest calves, were predicted to consume the least energy; and were therefore most efficient among the breeds that were evaluated. These results are useful as inputs to bioeconomic models that can be used to predict productive and economic outcomes from crossbreeding and to facilitate recommendations for beef producers of southern Brazil and other similar subtropical climatic regions.

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Aplicação de modelos não-lineares para descrever a evolução de características de crescimento e carcaça em bovinos da raça Hereford

Cited by 7 publications

References 8 publications

Fitting nonlinear autoregressive models to describe coffee seed germination

Fitting nonlinear autoregressive models to describe coffee seed germination

Alternative adjustment of scrotal circumference for growth traits in Nellore cattle

Crossbreeding effects on growth and efficiency in beef cow–calf systems: evaluation of Angus, Caracu, Hereford and Nelore breed direct, maternal and heterosis effects

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