Estimating genetic parameters of reproductive, carcass, and meat quality traits in Polled Nellore cattle

Mamede, M. M. S.; Rosa, Guilherme J. M.; Eifert, E. C.; Lopes, Fernando Brito; Baldi, Fernando; Costa, M. F. O. e; Sainz, Roberto Daniel; Carmo, Adriana Santana do; Mascioli, Arthur dos Santos; Magnabosco, C. de U.

doi:10.1007/s11250-023-03541-3

Cited by 2 publications

(5 citation statements)

References 27 publications

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“…The SC during the PPT, ranging from 21 to 31 cm, differs from the results reported by Mamede et al [19] for the same age range in the Nelore breed (19.73 cm and 21.68 cm at 365 and 450 days of age, respectively). Compared to Guzerat breed animals, the values obtained were higher than the variation of 20.8 to 23.3 cm [20] and 20.87 to 23.24 cm [21].…”

Section: Resultscontrasting

confidence: 93%

“…The SC has a favorable genetic correlation with age at first calving in females, as reported by [25,26], indicating the sexual precocity of the Guzerat breed. Selection for SC can genetically improve the precocity of the herd as it has moderate to high heritability estimates, providing a quick financial return to the [19].…”

Section: Resultsmentioning

confidence: 99%

“…The REA showed early development (Table 5), which is desirable in a cattle herd as it is moderately correlated with the animal's weight gain [18], demonstrating high-value cuts and accumulated productivity [19], and that the growth of the Longissimus dorsi muscle is a good parameter for evaluating animal growth [16]. The allometric function used to describe allometric growth through the growth curves of body parts in relation to the body weight, by detecting high correlations between the traits [4], provides consistency to these statements.…”

Section: Resultsmentioning

confidence: 99%

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B-spline polynomials models for analyzing growth patterns of Guzerat young bulls in field performance tests

Sousa,

Magaço,

Scalez

et al. 2024

Anim Biosci

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Objective: The aim of this study was to identify suitable polynomial regression for modeling the average growth trajectory and to estimate the relative development of the rib eye area, scrotal circumference, and morphometric measurements of Guzerat young bulls.Methods: A total of 45 recently weaned males, aged 325.8±28.0 days and weighing 219.9±38.05 kg, were evaluated. The animals were kept on Brachiaria brizantha pastures, received multiple supplementations, and were managed under uniform conditions for 294 days, with evaluations conducted every 56 days. The average growth trajectory was adjusted using ordinary polynomials, Legendre polynomials, and quadratic B-splines. The coefficient of determination, mean absolute deviation, mean square error, the value of the restricted likelihood function, Akaike information criteria, and consistent Akaike information criteria were applied to assess the quality of the fits. For the study of allometric growth, the power model was applied.Results: Ordinary polynomial and Legendre polynomial models of the fifth order provided the best fits. B-splines yielded the best fits in comparing models with the same number of parameters. Based on the restricted likelihood function, Akaike's information criterion, and consistent Akaike's information criterion, the B-splines model with six intervals described the growth trajectory of evaluated animals more smoothly and consistently. In the study of allometric growth, the evaluated traits exhibited negative heterogeneity (b<1) relative to the animals' weight (p<0.01), indicating the precocity of Guzerat cattle for weight gain on pasture.Conclusion: Complementary studies of growth trajectory and allometry can help identify when an animal's weight changes and thus assist in decision-making regarding management practices, nutritional requirements, and genetic selection strategies to optimize growth and animal performance.

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Section: Resultscontrasting

confidence: 93%

Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

See 1 more Smart Citation

B-spline polynomials models for analyzing growth patterns of Guzerat young bulls in field performance tests

Sousa,

Magaço,

Scalez

et al. 2024

Anim Biosci

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“…It's important to note that while there are breed standards and guidelines for desirable carcass conformation and fattening levels, there is inherent variability within any beef cattle population. This variation allows for genetic diversity and the potential for improvement through selective breeding programs (Barro et al, 2023;Mamede et al, 2023). Additionally, consumer preferences and market demands may in uence the perceived value of different carcass conformations and fattening, resulting in variations in desirability depending on the speci c market or end-use of the meat.…”

Section: Body Nenessmentioning

confidence: 99%

“…The carcass characteristics, particularly carcass weight and conformation, showed rather modest meat traits in the local Algerian cattle population, which has never been subjected to a reasoned selection program within the framework of the genetic improvement of meat production performance. Recent studies showed that yearling weight, visual scores of body structure, muscularity, and precocity, fattening and conformation carcass traits have moderate to high heritability (Barro et al, 2023;Mamede et al, 2023) with signi cant genetic correlation between body weight (BW) at slaughter on carcass and meat quality (Albertí et al, 2005). Thus, the high variance level for most of the studied parameters, explaining the heterogeneity of individuals in the local cattle population, which would make it easier to undertake a selection program to improve bulls economic value.…”

Section: Body Nenessmentioning

confidence: 99%

Slaughter performances, body composition and carcass traits of indigenous Algerian cattle "Brune de l'Atlas"

Gherissi,

Lamraoui,

Chacha

et al. 2023

Preprint

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The present study consists of an assessment of the slaughter performance, body composition, and carcass traits of 51 native Algerian bulls 'Brune de l'Atlas' belonging to four ecotypes, aged 1 to 2 years, and fattened for a period of 4 to 6 months. Its main objective is to provide an estimate of the mean parameters related to meat production in terms of quantity and quality, including live weight and body composition, slaughter yield, conformation, fatness, and fineness of carcasses. The average live weight is 366.56±92.56 kg. The average true and commercial dressing percentages are 60.11±11.09% and 56.1±10.04%, respectively. The studied animals produce lean carcasses with a low proportion of body fat. The fattening index and the score of the fattening state are 5.9±3.86% and 14.81±7.67, respectively, and the score of the fattening state is 1.85±0.83. As for the carcass conformation, it is relatively insignificant. The thigh compactness index is 4.82±1.59, the carcass compactness index is 1.55±0.37, the buttock compactness index is 0.69±0.02, and the average EUROP carcass classification score is 1.86±1.04 (≈O class). Significant positive correlations were found between body live weight and carcass weight, 5th quarter and carcass conformation, and negative correlations with slaughter yield and body fineness. These results showed an interesting level of slaughter performance of the local Algerian cattle population. The latter could contribute to satisfying the growing demand for red meat and reducing the costs of red meats imports through the improved valuation of its butchering performance by implementing genetic, nutritional, and other management practices improvements.

show abstract

Estimating genetic parameters of reproductive, carcass, and meat quality traits in Polled Nellore cattle

Cited by 2 publications

References 27 publications

B-spline polynomials models for analyzing growth patterns of Guzerat young bulls in field performance tests

B-spline polynomials models for analyzing growth patterns of Guzerat young bulls in field performance tests

Slaughter performances, body composition and carcass traits of indigenous Algerian cattle "Brune de l'Atlas"

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