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| Costa, Carolina Floret; Arrigoni, Mário De Beni; Martins, Cyntia Ludovico; Sarti, Luís Marcelo Nave; Franzói, Maria Caroline Silva; Pereira, Ismael Castro. |
| This study aimed to evaluate the effects of diets supplemented with natural or rúmen-protected lipid source on plasma cortisol concentration, animal reactivity and stress of feedlot cattle. One hundred and twenty Nellore bulls (366.9 ± 28.7), male, raised on pasture were distributed in a completely randomized design with measures repeated over time. There were three treatments: Control - without additional fat source; GDESP - with natural fat source based on cottonseed by-products; and GPROT - with rúmen-protected polyunsaturated fat acid. Blood samples were collected before to boarding of animals (day 0) and after transport to the feedlot, on days 1, 3, 7 and 14. There was significant effect (p<0.05) between temperament and day of analysis, as well as... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Cortisol; Estresse; Lipídeos; Reatividade.. |
| Ano: 2016 |
URL: http://e-revista.unioeste.br/index.php/scientiaagraria/article/view/10902 |
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| Costa, Carolina Floret; Brichi, André Luis Coneglian; Pereira, Ismael Castro; Factori, Marco Aurélio; Martins, Cyntia Ludovico; Arrigoni, Mário De Beni. |
| To enhance the efficiency of production of beef, some countries use β-adrenergics, promoters of non-hormonal growth, on final phase of beef cattle. These substances are chemically and pharmacologically similar to the natural catecholamines (dopamine, noreprinephrine and eprinephrine) and promote an increase of the deposition rate of muscle tissue, with consequent decrease in the deposition of adipose tissue. The β-adrenergic most used in beef cattle are ractopamine hydrochloride and zilpaterol hydrochloride. These products should only be used in confined cattle during the finishing period. According to studies, there are various effects of administration of β-adrenergic for beef cattle. The main effects are increased muscle mass, with consequent increase... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Beta-agonistas; Confinamento.. |
| Ano: 2015 |
URL: http://e-revista.unioeste.br/index.php/scientiaagraria/article/view/10232 |
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