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Articles by Jose A. Toca Ramirez
Total Records ( 2 ) for Jose A. Toca Ramirez
  Jose Luis de la Cruz Gamez , Jose A. Toca Ramirez , Esperanza Herrera Torres , Manuel Murillo Ortiz , Juan Ramon Esparza Rivera and Francisco O. Carrete Carreon
  The positive sensory and nutritious attributes of ruminant meat have been overshadowed in recent years by the perception involving a high contribution of saturated fat to the diet with negative health effects. However along with dairy products, beef has been the largest source of Conjugated Linoleic Acid (CLA) which could have several benefits for human health. This study evaluated in laboratory data from 50 beef samples taken at random from a beef slaughtering plant of Federal Inspection type (TIF) for CLA determination, using the Gas Chromatography method (GC), the impact of factors related to animals (feeding system, feed type, sex, age, breed and origin) on the CLA proportion in the longissimusdorsi muscle. Among these factors, only significant differences (p<0.05) were found for the origin of the animals in the proportion of CLA content in different places of origin. However, intrinsic factors (breed, age, sex and type of muscle) could modulate the CLA proportion in beef from 24-47%. The specific biological properties of these isomers should determine the understanding and consequences in the variations of intramuscular CLA isomers for health of consumers.
  Mayela Patricia Gallegos de la Hoya , Jose A. Toca Ramirez , Pedro Rodriguez Contreras , Carmen Elisa Pinzon Diaz , Fanny Olivia Reveles Saucedo and Jose Salome Quintero Saucedo
  Leptin is produced in the adipose tissue and other organs. Its main function is to maintain glucose homeostasis indicating the status of the reserve of energy to ventromedial nucleus of the hypothalamus; target of leptin which regulates eating behavior, so this is considered a sensor of energy balance. This hormone is involved in the onset of puberty and acts as a critical hormonal signal of nutritional status in the neuroendocrine regulation of pulsatile secretion of Growth Hormone (GH) and release of Gonadotropin-Releasing factor (GHRH) mediated by Neuropeptide Y (NPY). This hormone is involved in the onset of puberty and acts as a critical hormonal signal of nutritional status in the neuroendocrine regulation of pulsatile secretion of GH and release of GHRH mediated by NPY. Leptin also controls the hypothalamic-hypophysis-gonadal axis through synthesis and release of hypothalamic and hypophyseal gonadotrophins (GnRH, FSH and LH) and potentiates the effects of insulin through which regulates the synthesis of blood glucose. The regulation of secretion of this hormone is at long term and depends on the variation in body mass and stimulating effects of insulin because of this, it has great importance in the transition period in dairy cattle in which during the time of drying the body condition and fat reserves are recovered for postpartum performance. The cattle breed tically determines the amount of body fat and leptin secretion which in turn determines the quality of the carcass.
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