Browsing by Author "VILLARRETA, Elias Tunon"

Filter results by typing the first few letters
Now showing 1 - 3 of 3
  • No Thumbnail Available
    Item
    Algumas considerações sobre a eficiência produtiva de vacas leiteiras de alta produção
    (Centro Universitário da Fundação de Ensino Octávio Bastos, 2004-09-30) ALVAREZ JÚNIOR, Roberto Aparecido; VILLARRETA, Elias Tunon
    The objective of this literature review is based on data from the researched literature regarding the economic efficiency of high production dairy cows, to discuss postpartum efficiency data due to the higher negative energy balance, first postpartum heat, pregnancy rates, heat silent, increased incidence of double ovulations, altered levels of progesterone, estrogen, IGF -1, luteinizing hormone and embryonic death.
  • No Thumbnail Available
    Item
    Efeitos do estresse térmico sobre os parâmetros produtivos e reprodutivos de vacas leiteiras
    (Fundação de Ensino Octávio Bastos, 2004-09-30) MATURANA FILHO, Milton; VILLARRETA, Elias Tunon
    This literature review aims to discuss thermal comfort variables and their effects on the production and reproduction of dairy cows. It has been found that in tropical countries, dairy cows are influenced by unfavorable environmental conditions and compromise the maximum expression of superior genotypes.
  • No Thumbnail Available
    Item
    Mecanismos endócrinos envolvidos no reconhecimento materno do embrião em bovinos
    (Centro Universitário da Fundação de Ensino Octávio Bastos, 2004-09-30) ALVAREZ JÚNIOR, Roberto Aparecido; TUNIN, Adriana Maria Favaro; MATURANA FILHO, Milton; VILLARRETA, Elias Tunon
    The purpose of this literature review is to describe the antiluteolytic mechanism estimated by the conceptus. It is known that interferon-tau is secreted by the bovine embryo in order to suppress the synthesis of prostaglandin (PGF) from epithelial cells in order to maintain pregnancy. The mother's endocrine mechanisms are also responsible for the development of the embryo, in which the production of progesterone by the corpus luteum stands out.