Peso, idade e perfil bioquímico, hematológico e hormonal de novilhas Nelore à puberdade
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2013-07-12
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Universidade Federal de Goiás
Resumo
The age of puberty is a feature of great importance in beef cattle for it allows the
anticipation of the reproductive activity of females and increases the productivity of
the livestock sector. Anticipation of the puberty is possible due to the influence of
environmental and genetic factors on this feature. The interaction of pubertal
phisiology with these factors is not fully understood, hindering the application of
managements for its reduction. To better understand the puberty physiology in
heifers, we studied the involvement of the hormone leptin, leptin receptor gene
and biochemical and hematological profiles in the occurrence of puberty. The
study was conducted following 56 heifers raised on pasture during 17 months.
Blood samples were collected at intervals of two months for biochemical
characterization, hematological profiles, and to measure progesterone and leptin
concentrations as well as the leptin receptor gene sequence. We observed a
correlation between the occurrence of puberty and total protein, globulin,
phosphorus, magnesium, alanine fosfatase (ALP), aspartate aminotranferase
(AST), the number of red blood cells, hematocrit and platelets. In the present study
it was not possible to define the role of biochemical and hematological
components with the occurrence of puberty, thus more studies are necessary to
better understand this relationship. A better understanding of the involvement of
leptin in the pubertal phisiology more detailed study on leptin receptor gene,
seeking a reliable molecular marker for sexual precocity, are also necessary.
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ABUD, Lucas Jacomini. Peso, idade e perfil bioquímico, hematológico e hormonal de novilhas Nelore à puberdade. 2013. 81 f. Tese (Doutorado em Ciência Animal) - Universidade Federal de Goiás, Goiânia, 2013.