Desempenho de bovinos Nelore e cruzados Blonde d'Aquitaine x Nelore do nascimento ao desmame

Menezes, Lenice Mendonça de; Pedrosa, Amaro Calheiros; Pedrosa, Daniel; Fernandes, Sonyara

doi:10.1590/s1519-99402013000100018

Cited by 7 publications

(8 citation statements)

References 6 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…The effects of sex, season, and year of birth showed were significant (p < 0.001) in both models (Table 1), indicating the need to consider these variables when comparing the performance of animals, and to include them in contemporary training in genetic evaluation. These results are consistent with those reported by Brandt, Müllenhoff, Lambertz, Erhardt and Gauly (2010); Menezes et al (2013); and Pereira and Muniz (2013). The observed effects of sexual dimorphism may be related to the greater weight of males, and consequently the generally higher hormonal levels and metabolic rates, which in turn leads to greater feeding capacities and faster growth, in comparison to those of females (Biffani et al, 1999).…”

Section: Resultssupporting

confidence: 91%

“…The effects of birth season are mainly associated with the increased availability and quality of forage for the dams, thereby facilitating a peak in milk production (McManus et al, 2002). Another factor associated with the season of birth, is low precipitation (dry season) at colder times of the year that results in a lower incidence of parasites and diseases (Menezes et al, 2013). In contrast, the warmer season associated with high humidity, facilitates an increase in parasites that can compromise normal development in the calf.…”

Section: Resultsmentioning

confidence: 99%

“…Other factors reportedly influence the growth of an animal, including gender, environmental management, maternal ability, maternal environment, and year and season of birth (Malhado, Carneiro, Martins Filho & Azevedo, 2009;Menezes, Pedrosa, Pedrosa & Fernandes, 2013;Oliveira et al, 2006;Vieira et al, 2005). However, few studies with pure-and crossbred (Wagyu, Nellore, and Brangus) calves have been conducted in the sub-region of Aquidauana Pantanal.…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

<b>Performance in preweaning pure and crossbred calves in the Mato Grosso do Sul Pantanal region, Aquidauana, Mato Grosso do Sul State, Brazil

Fialho

Rezende

Souza

et al. 2015

Acta Sci. Anim. Sci.

View full text Add to dashboard Cite

Purebred and crossbred calves (n = 3,871) were selected that were born in the sub-region of the Pantanal of Aquidauana (Brazil), derived from Nellore, Brangus, Wagyu, and ½ Brangus + ½ Nellore cows, which were artificially inseminated by bulls of the Aberdeen Angus, Red Angus, Brangus, Nellore, and Wagyubreeds. Parameters such as weaning weight, daily gain from birth to weaning, and the number of days to gain 160 kg, were assessed inthese calves and phenotypic correlations between the traits were evaluated. Data were analyzed using two statistical models. The first model included sire breed effects, the genetic group of the cow, sex, year of birth (AN), birth season (EN), and the interaction AN * EN. The second model included the genetic group of the calf, sex, AN, EN, and the interaction AN * EN. The genetic group of the cow and calf and the interaction AN * EN did not significantly affect body weight (p < 0.05). The average weaning weights of progeny were as follows:

show abstract

Section: Resultssupporting

confidence: 91%

Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

<b>Performance in preweaning pure and crossbred calves in the Mato Grosso do Sul Pantanal region, Aquidauana, Mato Grosso do Sul State, Brazil

Fialho

Rezende

Souza

et al. 2015

Acta Sci. Anim. Sci.

View full text Add to dashboard Cite

show abstract

“…Average birth weights ranged from 29.5 kg to 32.8 kg in previous reports (HOLANDA et al, 2004;MENEZES et al, 2013;ARAÚJO et al, 2014), for Nellore herds in Midwestern and Northeastern Brazil, compared to 37.6 kg in this study. The same was true for the adjusted 120-day weight 138.4 kg, compared to 119.1-129.0 kg in GARNERO et al, 2010;SOUZA et al, 2011), for the adjusted 205-day weight compare Table 1 to SANTOS et al, 2012;AMARAL et al, 2014;ARAÚJO et al, 2014), and for adjusted 365-day and 550-day weights, compare Table 1 with the study by (RIBEIRO et al, 2001;GARNERO et al, 2010).The high birth weight measured in this study might result from the selection criteria adopted for the analysis, which included birth weight in the calculations of adjusted weights at weaning.…”

Section: Resultscontrasting

confidence: 38%

“…Birth weight plays an important role in a calf's ability to express its genetic potential, but should be monitored to prevent dystocia: in Nellore cows, calving ease is associated with moderately low birth weights (30 kg on average) (HOLANDA et al, 2004;MENEZES et al, 2013;ARAÚJO et al, 2014). Calf weights at 120 days and 205 days (weaning weight) indicate a cow's producing ability, because maternal effects directly influence calf performance at these stages (CARDOSO et al, 2004).…”

Section: Introductionmentioning

confidence: 99%

Genetic parameters of growth traits in Nellore cattle

Kamei

Ribeiro

Fonseca

et al. 2017

SCA

View full text Add to dashboard Cite

This study evaluated non-genetic factors and calculated heritability estimates of direct and maternal effects for growth traits in Nellore cattle raised in southern Brazil. Performance records of 4170, 1538, 3139, 1830, and 1151 calves born from 2005 to 2011 were analyzed for birth weight (BW), adjusted120-day weight (W120), adjusted 205-day weight (W205), adjusted365-day weight (W365), and adjusted 550-day weight (W550), respectively. The components of (co)variance used to calculate heritability estimates were determined by Derivative-Free Restricted Maximum Likelihood using the MTDFREML software. Contemporary groups were included in the model as fixed effects, and direct and maternal effects, permanent environmental effects, and residual errors were included as random effects. Phenotypic correlations were estimated using the PROC CORR procedure from SAS. Overall means for BW, W120, W205, W365, and W550 were 38, 138, 201, 270, and 376 kg, respectively. Heritability estimates for direct and maternal effects were 0.17 ± 0.04 and 0.11 ± 0.03 (BW), 0.14 ± 0.03 and 0.03 ± 0.04 (W120), and 0.17 ± 0.04 and 0.09 ± 0.03 (W205). Genetic, phenotypic, and environmental correlations were 0.79, 0.44, and 0.32 for BW and W120, 0.79, 0.39, and 0.26 for BW and W205, and 0.96, 0.74, and 0.75 for W120 and W205. The results indicate that selection for pre-weaning weight would be more efficient using W205, and genetic correlation coefficients indicate that selection at any age should produce a positively correlated response at older ages. Genetic, phenotypic, and environmental correlation coefficients between W365 and W550 were 0.99, 0.75, and 0.76, respectively. Selection for adjusted 550-day weight should produce the greatest genetic gains. Genetic correlation coefficients between weight traits indicate that selection for weight at older ages, which could help reduce the number of weighings and increase accuracy of selection at younger ages, produces gains at older ages. Key words: Beef cattle. Body weight. Correlation. Direct heritability. Maternal heritability. ResumoCom o objetivo de estudar os fatores ambientais e estimar os parâmetros genéticos, para os efeitos diretos e maternos, para as características de crescimento, foram utilizadas 4170, 1538, 3139, 1830 e 1151 observações de peso ao nascer (PN), peso ajustado aos 120 dias de idade (P120), peso ajustado aos 205 dias de idade (P205), peso ajustado aos 365 dias de idade (P365) e peso ajustado aos 550 dias (P550), de bovinos da raça Nelore nascidos no município de Amaporã-PR. As médias estimadas para PN, P120, P205, P365 e P550, foram 38 kg, 138 kg, 201 kg, 270 kg e 376 kg, respectivamente. Os componentes de (co) variância utilizados para estimar as herdabilidades foram obtidos por meio do programa MTDFREML, o modelo utilizado considerou o efeito fixo do grupo de contemporâneos, o efeito da idade da vaca ao parto como covariável, além dos efeitos aleatórios genéticos aditivo direto e materno e o efeito de ambiente permanente. As correlações fenotípicas foram estim...

show abstract

Economic efficiency of Rhipicephalus microplus control and effect on beef cattle performance in the Brazilian Cerrado

Calvano

Brumatti²,

Garcia

et al. 2019

Exp Appl Acarol

View full text Add to dashboard Cite

The cattle tick Rhipicephalus microplus causes significant economic losses to cattle production systems and is a main barrier to the introduction of Bos taurus breeds and their crosses in Brazil. These breeds have the genetic potential to generate animals that are more productive, but they are also more susceptible to R. microplus. One of the alternatives for conventional tick control is the use of strategic control, aiming at delaying or even preventing the development of its resistance to acaricides. The present study aimed to evaluate the economic losses caused by tick infestation on the productive performance of two breeds of beef cattle and to evaluate the economic efficiency of tick strategic control and its impacts on beef cattle production systems. Animal weights were obtained from the literature and were used to calculate the weight loss in kilograms (kg) and the economic loss (US$) caused by R. microplus infestation. The cost/loss ratio of performing strategic control was also calculated. The data show that tick infestation causes economic losses to the breeds and groups of animals evaluated and reduces animal performance (weight loss). The results show a loss of US$34.61/animal in the backgrounding phase and US$7.97/animal in the finishing phase for Brangus animals and its crosses. In conclusion, the data show that strategic control is economically efficient for Brangus animals in the backgrounding phase, independent of the methods used for acaricide application.

show abstract

Desempenho de bovinos Nelore e cruzados Blonde d'Aquitaine x Nelore do nascimento ao desmame

Cited by 7 publications

References 6 publications

<b>Performance in preweaning pure and crossbred calves in the Mato Grosso do Sul Pantanal region, Aquidauana, Mato Grosso do Sul State, Brazil

<b>Performance in preweaning pure and crossbred calves in the Mato Grosso do Sul Pantanal region, Aquidauana, Mato Grosso do Sul State, Brazil

Genetic parameters of growth traits in Nellore cattle

Economic efficiency of Rhipicephalus microplus control and effect on beef cattle performance in the Brazilian Cerrado

Contact Info

Product

Resources

About