Bulls Evaluation
Mostrando 13-24 de 52 artigos, teses e dissertações.
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13. Performance of Nellore young bulls on Marandu grass pasture with protein supplementation
The objective of this study was to verify the effect of low-intake supplementation on performance of Nellore young bulls kept on Marandu grass pasture. The experiment was divided in two periods: the dry and rainy seasons. Treatments during the dry period were composed of mineral salt with urea and mineral supplement enriched with true protein and additive. I
R. Bras. Zootec.. Publicado em: 2013-06
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14. Avaliação espermática do sêmen criopreservado de touros Curraleiro/Pé Duro em banco de germoplasma / Spermatic evaluation of cryopreserved semen from curraleiro/ pé duro bulls in germplasm bank
Esta pesquisa objetivou avaliar a qualidade do sêmen criopreservado de 21 touros Curraleiro/Pé Duro em banco de germoplasma, categorizando as doses dos reprodutores segundo parâmetros espermáticos que buscam a fertilização oocitária, e verificando in vitro o potencial fecundante da dose seminal. Todas as amostras foram descongeladas e analisadas pelos
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 28/02/2012
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15. Evaluation of models for prediction of the energy value of diets for growing cattle from the chemical composition of feeds
The objective of this study was to estimate and evaluate the contents of apparently digestible fractions of crude protein, ether extract and non-fibrous carbohydrates, the digestible fraction of the neutral detergent fiber and the content of total digestible nutrients (TDN) from the chemical composition of feeds in growing cattle fed different diets. Fourtee
R. Bras. Zootec.. Publicado em: 2012-09
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16. Testicular echotexture and seminal quality of young Montana Tropical Compound bulls classified as sound and unsound for breeding
The objective of this study was to investigate the relationship between testicular echotexture and seminal quality, in addition to evaluate the testicular parenchyma echogenicity pattern in young Montana bulls classified as sound and unsound for breeding. Fifty-two young Montana Tropical Compound bulls from 22 to 33 months of age were used. The animals were
R. Bras. Zootec.. Publicado em: 2012-08
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17. Causes of rejection of beef bulls in breeding soundness evaluation
The objective of this study was to analyze the rates of rejection in the different steps of the breeding soundness evaluation of beef bulls in the state of Rio Grande do Sul, Brazil. The breeding soundness of 22,113 young and mature bulls of 14 beef breeds, participating in the Program of Reproductive Evaluation (PARTO) was evaluated in the experiment. Data
Revista Brasileira de Zootecnia. Publicado em: 2012-07
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18. Leptin and insulin in the seminal plasma of zebu bulls in peripuberty
In order to determine the profile of leptin and insulin values in seminal plasma and their correlations with sperm patterns during the peripuberty, a total of 16 crossbred Gyr dairy bulls were monitored from 60 days before to 60 days after puberty, separated into two groups, early and regular, according to the onset of puberty. Hormone values were determined
Revista Brasileira de Zootecnia. Publicado em: 2012-04
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19. Performance and nutritional evaluation of beef cattle raised on pasture, castrated at different ages, with and without supplementation
The objective of this study was to evaluate performance and nutritional traits of beef cattle raised on pastures, castrated at different ages, with and without supplementation. Forty-four crossbred young bulls with predominance of Zebu breed at initial average age of 120±30 days were used in the experiment. Animals were distributed in a completely randomize
Revista Brasileira de Zootecnia. Publicado em: 2012-04
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20. In vitro and in situ activity of carboxymethyl cellulase and glutamate dehydrogenase according to supplementation with different nitrogenous compounds
Two experiments were carried out to evaluate the effect of supplementation with different nitrogenous compounds on the activities of carboxymethil cellulase (CMCase) and glutamate dehydrogenase (GDH). In the first experiment, four treatments were evaluated in vitro: cellulose, cellulose with casein, cellulose with urea, and cellulose with casamino acids. Aft
Revista Brasileira de Zootecnia. Publicado em: 2012-03
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21. Evaluation of mathematical models to describe growth of grazing young bulls
The objective of this study was to evaluate the use of different mathematical models to describe growth of grazing beef cattle. Data of 20 Nellore bulls with initial weight of 129±28.1 kg and final weight of 405±62.0 kg were used. The animals were randomly divided into four plots and placed on B. decumbens Stapf pastures. Three plots received concentrate s
Revista Brasileira de Zootecnia. Publicado em: 2012-02
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22. Generalized linear mixed models for the genetic evaluation of binary reproductive traits: a simulation study
The objective of this study was to evaluate the use of probit and logit link functions for the genetic evaluation of early pregnancy using simulated data. The following simulation/analysis structures were constructed: logit/logit, logit/probit, probit/logit, and probit/probit. The percentages of precocious females were 5, 10, 15, 20, 25 and 30% and were adju
Revista Brasileira de Zootecnia. Publicado em: 2012-01
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23. Avaliação da Proporção Sexual de Embriões Desenvolvidos In Vitro e de Progênie a Campo de Touros Jovens. / Evaluation of the Sex Ratio of Embryos Developed In Vitro and in Field Progeny of Young Sires.
Some of the main problems that affect the in vitro production of embryos is the variation among bulls in relation to fertility and the greater birth of male embryos. Many factors can change the ratio 1:1 between the genders, both in the in vitro production of embryos and in the method of artificial insemination. To try to change this sex ratio in vitro, we s
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 01/08/2011
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24. Utilização de diferentes metodologias para avaliação genética de bovinos de corte / Utilization of different methodologies for genetic evaluation of beef cattle
With the constant changes in the beef cattle production system, and an even more demanding consumer market, the focus on the carcass yield and quality is increasing. For the slaughters claims to be met, the breeder needs a tool that can identify the bulls that will be, in fact, the improvers to those specific features. Therefore, this project aims to: (i) Es
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 15/06/2011