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Articles by M.E. Trujillo-Ortega
Total Records ( 4 ) for M.E. Trujillo-Ortega
  S?nchez-Aparicio P , M. Gonz?lez-Lozano , D. Mota-Rojas , M. Alonso-Spilsbury , M.E. Trujillo-Ortega , R. Ram?rez-Necoechea and 2R.E. P?rez-Galv?n
  Artisan pig family farms are an important mean of income, in spite of their poor performance they represent a small capital fund that can be used when faced with urgent cash flow situations, or to face immediate family feeding needs. Boar service rental in urban and rural areas is still common, this consists of renting boars for breeding in exchange of cash or in species. The objective of the present study was to carry out a retrospective analysis of the records of 63 boars, in order to characterize the frequency of use, age, preferred breed by the public of the region, and distances walked and traveled by the boars in service in the Chinampa region of Xochimilco, Mexico City. An average of 0.19 to 0.27 mountings per day was observed which corresponds to 1.36 and 1.92 mountings per week. Boars had short intervals between mountings, one or two days, or else carried out one mounting per year, registering an average of 15.94 days between breedings. Boars older than twelve months had the highest number of mountings, more than 50, and were used only for one year. Surprisingly, males staying for 3 to 4 years, were not the ones that registered more mating activity since these pigs could not overcome an average of 40 mountings during their 4 years staying at the farm. Distances walked by boars during service, varied from 0.5 km in the Chinampa region, to 25 km in urban areas. The results obtained in this study indicate that the reproductive efficiency in backyard swine breeding can not be established due to the lack of an appropriate reproductive program. It is necessary to consider hygiene and health measures in all the boars, since the increase in annual number of mountings could also rise the risk of venereal diseases during contact with females from different origin and unknown hygiene habits.
  M. Alonso-Spilsbury , R. Ramirez-Necoechea , M. Gonzlez-Lozano , D. Mota-Rojas and M.E. Trujillo-Ortega
  Piglet death during the perinatal and lactation period is one of the more easily identified causes of reduced production efficiency in swine herds. Pre-weaning mortality rates vary between 12 and 25%. The present review analyses factors related with non-infectious pre-weaning mortality. Among the maternal factors, farrowing and intra-uterine asphyxia, behaviour and maternal ability are discussed. Piglet factors include newborn vigour, teat seeking ability, acidosis, hypothermia and hypoglucemia. Even though there had been technological changes and improvements in husbandry, housing designs and preventive measures, piglet mortality in lactation remains a major economical and welfare problem. The major causes of pre-weaning mortality are those associated with basic husbandry skills, starvation and crushing by the sow. One potential alternative to reduce neonatal mortality in pigs is the monitoring of foetal stress during birth, it is also important to consider the physiological, behavioural and biochemical changes that take place during early lactation which subsequently affect the vitality, maturity and development of neonatal pigs. A mortality rate of say 8% of piglets born alive is possible and should be the target, getting more knowledge of factors influencing piglet non-infectious mortality within the first three days may help improve piglet welfare.
  P. Sanchez-Aparicio , D. Mota-rojas , R. Ramirez Necoechea , A. Olmos-Hernandez , M. Alonso-Spilsbury , D. Villanueva-Garcia , M.E. Trujillo-Ortega and R. Hernandez-Gonzalez
  Sildenafil citrate is an orally administered effective treatment for erectile dysfunction; nevertheless administrated in high concentrations produces relaxation of myometrium in pregnant women, thus sildenafil or related molecules may have future potential tocolytic application. In the present review sildenafil mechanism of action, pharmakocinetics and therapeutic use are discussed. Sildenafil is also considered a potent pulmonary vasodilator in pharmacology representing an alternative to neonates during the last month of in utero development. We conclude that studies in animals including metabolic and physiological traits in the fetus and neonates from treated dams with sildenafil in their last third of pregnancy may help to characterize neonate tolerance to asphyxia with posterior application in human perinatology.
  D. Mota-Rojas , M. Becerril Herrera , M.E. Trujillo-Ortega , M. Alonso-Spilsbury , S.C. Flores-Peinado and I. Guerrero-Legarreta
  The aim of this research was to study the effects of pre-slaughter transport and lairage on the chemical serologic profile of swine, as well as its relationship with qualitative aspects of meat: pH, color and temperature. Forty eight Pietrain x Landrace pigs were monitored (24 females and 24 barrows). They were transported on straw bedding trucks without stops during 2 h and deprived of feed and water. Blood samples were taken before loading, at arrival to the slaughterhouse, after lairage and during bleeding (20 sec after they were electrically stunned). At arrival to the slaughterhouse pigs were randomly distributed in 4 groups: Rested (n = 24) non-rested (n = 24) these groups were also divided by sex. Blood samples were taken form groups 1 and 2 and the animals sent directly to the slaughter pens, whereas groups 3 and 4, after blood sampling, were taken to lairage pens. Glucose and Creatine Kinase (CK) showed a high increase in blood concentration, associated to an increase in muscular activity and a decrease in globulins concentration as a consequence of stress and immunosuppression. Hyperglycemia and lactic acidosis detected in animals without rest were statistically different (p<0.05) compared to the group that rested. Bicarbonate level significantly decreased (p<0.05) in non-rested animals as compared to rested animals. Results indicated that animals without rest before slaughter can show hemodynamic and metabolic alterations that lead to hyperglycemia, lactic acidosis and an abrupt descent of pH, altering the carcass color.
 
 
 
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