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Articles by R. Ramirez-Necoechea
Total Records ( 15 ) for R. Ramirez-Necoechea
  I. Escobar-Ibarra , L. Mayagoitia , C. Gonzalez-Rebeles , R. Ramirez-Necoechea , D. Mota and M. Alonso-Spilsbury
  The aim of the study was to analyse the scent marking patterns in frequency, type and position throughout the reproductive period of two pairs of Canis lupus baileyi housed in two zoos (LZ = Leon and ZZ = Zacango), in terms of newly and established pairs. Focal behaviour sampling was used to register 1,211 scent markings. Data were grouped in three periods: before, during, after and posterior to the reproductive season. Between newly formed pairs no significant difference was found in the previous period (U = 6.50, p>0.065); also, no significant difference was observed in the double marking (U = 54.0, p>0.083) during the reproductive season, although it was greater in the LZ compared to the ZZ pair. After commingling together for one year the established LZ couple, showed an increase in double marking (U = 16.5, p<0.001) during the mating period in comparison with the prior year. Male wolves marked with greater frequency with the leg raised in both, the double and single marking, whereas females marked more in a squatting position. It is concluded that scent marking is different in recently formed pairs in captivity, which are found in a reduced space and have not free choice to elect its mate.
  M. Sciences-Hernandez , M. Soriano-Lopez , D. Mota-Rojas , A. Vergara Iglesias , R. Ramirez-Necoechea , A. Olmos-Hernandez , J. Toca-Ramirez and M. Alonso-Spilsbury
  Ambystoma mexicanum is an amphibian endemic to Xochimilco Lake in Mexico City. It has been declared in danger of extinction and is under special protection. Some chemical contaminants in the water are extremely high and could be the cause of its high mortality rate in certain areas of Xochimilco. In order to preserve this species it will not only be necessary and fundamental to prohibit fishing axolotls in their natural state, a market study and nutritional chemical analysis will also be necessary in order to establish the organoleptic properties and level of acceptance before a taste panel; that is to say, get to know more about the specie in order to give the product added value offering its meat as an unconventional delicacy. This way the creation of farms that will help its conservation will be justified. On the other hand it is important to mention that the axolotls are very important in scientific research. Since it serves as an amphibious model for many physiological and morphological processes that explain the regenerative process that this species possess. The objective of this study is to emphasize the advantages that the Ambystoma mexicanum has with the intention to rationally exploit these attributes in order to achieve its conservation.
  M. Alonso-Spilsbury , I. Escobar-Ibarra , L. Mayagoitia , R. Ramirez-Necoechea and D.Mota-Rojas
  The social and maintenance behaviors of two pairs of Mexican gray wolf in captivity were studied. Wolves belonged to Zacango (ZZ) and Leon Zoo (LZ). For the ZZ pair significant differences were observed (p<0.01) for the social behaviors, whereas no differences were found for neutral or affiliative behaviors. The LZ pair showed no differences in social behavior before the breeding season, but after this significant differences were observed for playing and sexual activity (p<0.001). Wolves showed a preference (p<0.0001) to perform their activities on a reduced place far away from the human transit, especially those related with the courtship behavior. For the ZZ pair a total number of 389 mounting observations were registered during 11 consecutive days, most of them with pelvic movements but only two culminating with copulation (0.6%). The LZ pair showed a reproductive activity of 180 mountings, three of them culminating with copula (1.6%); none of the pairs showed reproductive success. Reproductive success depends on both physiological and behavioral compatibility, but some other causes may be involved in the reproductive failure of the ZZ pair, among them the stress of restraining for the cytology studies and the housing conditions like the presence of large predators as closer neighbors to the wolves.
  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.
  M. Becerril , C. Lemus , J.G. Herrera , M. Huerta , M. Alonso-Spilsbury , R. Ramirez-Necoechea , D. Mota-Rojas and J. Ly
  A 2x2 factorial arrangement was used for evaluating carcass traits and meat quality of 22 Yorkshire x Landrace (YL) and 13 Pelón Mexicano (PM) castrate male and female pigs 63 days old which were allotted at random during 16 weeks into 2 rearing systems consisting of total (15 and 7 pigs) or partial confinement (7 and 6 pigs). Partial confinement included rearing animals outdoors in a grass prairie (Brachiaria brizantha) from 9-16 h. There were no significant differences (p<0.05) for the interaction rearing system x genotype in any measurement conducted throughout this experiment. Highly significant (p<0.001) differences between genotypes was encountered for carcass yield and primary cuts adjusted to slaughter weight as covariable. However, carcass yield expressed as percentage of slaughter weight only tended (p<0.103) to favour YL pigs. Differences between rearing systems were less marked, with better carcass traits in either totally confined YL animals or partially confined PM pigs. The genotype effect was at least significantly (p<0.01) different in all measurements indicating a higher fat content in carcasses of PM pigs, when compared to YL animals. Length of some reservoir digestive organs were significantly (p<0.001) higher in PM than in YL pigs. There were no significant differences (p>0.05) in meat quality indices, including meat pH, water holding capacity, color and marbling. It is considered that a total or partial confinement, consisting on daily grazing outdoors, rearing system, has less influence on carcass traits in pigs when Pelón Mexicano and Yorkshire x Landrace pigs are compared.
  M. Becerril , C. Lemus , J.G. Herrera , M. Huerta , M. Alonso-Spilsbury , R. Ramirez-Necoechea , D. Mota-Rojas and J. Ly
  A 2x2 factorial arrangement was used for evaluating performance traits during 16 weeks in 2 groups of 22 Yorkshire x Landrace (YL) and 13 Pelón Mexicano (PM) castrate male and female pigs 63 days old which were allotted at random into 2 rearing systems consisting of total (15 and 7 pigs) or partial confinement (7 and 6 pigs). Partial confinement included rearing animals outdoors in a grass prairie (Brachiaria brizantha) from 9:00-16:00 h. No significant differences (p<0.05) for the interaction rearing system x genotype were found in any measured performance trait. It was observed that treatments involving Yorkshire x Landrace animals had a high significant (p<0.001) live weight at any age, as compared to the PM pigs. It was evident that YL pigs had a higher daily feed intake than PM animals and on the other hand, results from animals in confinement clearly indicated that feed intake in those pigs was higher than in the others, permitted to graze during 8 h every day. Calculated daily gain was 820 and 757 g in YL pigs when reared in total confinement or partially outdoors, whereas this same trait was 414 and 335 g in PM pigs. When a comparison was made between improved and local pigs reared in total confinement, feed conversion was on average, 3.07 kg kg-1 in the YL animals and 5.03 kg kg-1 in the PM pigs.
  K. Mejia-Martinez , C. Lemus-Flores , J.F. Zambrano-Zaragoza , R. Ramirez-Necoechea , D. Mota-Rojas and M. Alonso-Spilsbury
  The aim of the study was to measure the cytokine immune response in 2 Mexican creole biotypes and compare it to commercial pigs (COM) as disease resistance indicators. Twenty six commercial (COM), 25 Cuino (CP) and 25 Mexican hairless (MHP) pigs were vaccinated with a commercial bacterin containing Salmonella, E. coli and Pasteurella at 45 days of age; a sample was taken a week later to test serum levels of interleukin 1 (IL-1 ), interleukin 4 (IL-4), interferon-gamma (INF- ) and alfa tumor necrosis factor (TNF- ). Cytokine quantification serum tests were carried out with commercial kits using the ELISA sandwich method. The Kruskal-Wallis test was used to compare cytokine concentrations and the Wilcoxon test was run to look for differences among breeds. IL-1 and IL-4 production was higher in HMS as compared to the other breeds. No significant differences between INF- and TNF- production were seen. Results suggest that MHP have a higher response capacity before an infection, compared to the other breeds.
  J.A. Toca Ramirez , E. Salazar Sosa , R.T. Zuniga , J.S.C. Serrato , M.E. Pereda Solis , J. Toca Ramirez , F.O. Carrete Carreon , H. Herrera Casio and R. Ramirez-Necoechea
  We make a review of the importance of Phosphorus manure (P) as an environment contaminant and its relationship with organic and sustainable agriculture. The P elimination pathway related with intensive livestock production in described as well as the soil harmful effect. The natural resistance against high levels of soil P shown by some plants is pointed out. Also, procedure to reduce manure P excretion. The poor handling of livestock manure coming out from intensive farming has a very high P contents with represent a dangerous challenge to the environment. Two main tools are available to reduce for P harmful effect one are the phytase inclusion in feed stuffs and two the growing of P resistant plants.
  M. Carrillo del Valle , D.T. Velez-Trujillo , I. Guerrero-Legarreta , M. Becerril-Herrera , R. Ramirez-Necoechea , M. Alonso-Spilsbury , S. Flores-Peinado and D. Mota-Rojas
  The research for post-mortem tenderizing methods comes about from the need to provide good tasting and uniform quality in meat products, considering tenderness as the most important quality characteristic. A number of researchers studied various methods in order to improve meat tenderness cause by the physico-chemical condition of muscle contractile proteins, connective tissue or both. During post mortem storage, the muscle undergoes a series of biochemical, histological and physical events which collectively are called rigor mortis. Variation of rigor mortis events largely influences meat acceptability. Electric Stimulation (ES) directly affects meat sensory characteristics (color, odor and flavor and tenderness). Other factor determining meat quality of stimulated meat are time elapsed from slaughtering to stimulation, ripening and storage temperature after stimulation.
  M.J. Maldonado , D. Mota-Rojas , M. Becerril-Herrera , S. Flores-Peinado , D. Camacho-Morfin , A. Cardona-Leija , R. Ramirez-Necoechea , L. Morfin-Loyden , M. Gonzalez-Lozano , M.E. Pereda-Solis and M. Alonso-Spilsbury
  The objective of this study, was to evaluate the effect of two stunning methods on blood gasometry, metabolic profile, acid-base balance and carcass quality on broilers. Sixty broilers were monitored. Before sacrifice, the birds were weighed and randomly divided by sacrifice method into 2 groups: decapitation (30) and electric stunning (30). Bleeding was timed and a blood samples were taken in order to evaluate critical blood parameters. The chickens remained 7 sec in the scalding bucket at a 33 C, carcass meat pH and temperature were measured warm, post thermal shock and cold. The pCO2 was the highest value measured on the desensitized chickens using the electric stunning method and the pO2 was higher on the decapitated birds. Even though no differences were noted, it is worth mentioning that glucose levels were higher than 200 mg dL-1 and lactate was extremely low (5 mg dL-1) regardless of sacrificial method. Highly significant differences were observed in pre-shock pH and post shock values of the decapitated bird (from acid to neutral). We conclude that regardless of the sacrificial method, the physiological variables were not modified between groups, and therefore had no negative effects on the broiler carcass.
  M. Becerril-Herrera , O. Guzman-Pina , M. Alonso-Spilsbury , E.V. Dorsey-San Vicente , C. Lemus-Flores , S. Flores-Peinado , R. Ramirez-Necoechea and D. Mota-Rojas
  The objective of the present study was to evaluate the morphometry and carcass traits of Creole goats sacrificed and packed in a Federal Inspection Plant (FIP). The study was carried out in a FIP abattoir during May and June 2004. Fifty Creole male goats, 40 to 50 days old were used, brought form nearby family farms. Goats were transported without stops and they were not fed, nor provided with water. Carcasses were graded and 11 indicators were measured: both hot and cold carcass yields, cold carcass temperature, viscera weight, morphometry and pH, among others. When comparing the hot carcass weight with and without viscera (5.03 vs. 4.55), the values measured indicated that viscera represented 20.22% of the animals weight. The difference observed between hot carcass and cold carcass weight was 4.55 vs. 4.28 kg, respectively. Positive correlations were determined (R = 0.96) between hind-limbs (R = 0.65) and forelimbs (R = 0.69), as well as the one registered of both limbs with the hind and fore canes` perimeters. On the other hand, the abdominal and thoracic regions were highly correlated (R = 0.9). This is an indicator of the animal biotype, which shows that these animals are long linear with highly developed limbs. The pH mean of the hot carcass and the cold carcass was 6.06 and 5.97, respectively.
  M. Becerril-Herrera , M. Zermeno , D. Mota-Rojas , G.H. Gonzalez , C. Casas-Garcia , J. Toca-Ramirez , R. Ramirez-Necoechea , J.A. Toca-Ramirez , C. Lemus-Flores and M. Alonso-Spilsbury
  Ten equine carcasses from creole horses were used, distributed by sex: 5 females and 5 males. Animals were identified with a mark in their posterior limbs using indelible ink in order to follow the carcass up to the butchery. Each cut was weighed in order to characterize the shrinkage percentage and carcass yield. Samples of the Longissimus dorsi muscle at the level of the tenth rib were taken at the butchery in order to carry out a proximal chemical analysis. The average percentage of protein was 18.6, which turned out to be 7.5% lower than the one reported by others authors. In adult animals gaskins, shoulder blades, ribs and flanks (spare meat for fillets) corresponded to 30.0, 21.3, 31.2 and 16.5%, respectively, of the total carcass. In young animals gaskins represented 29.5%, shoulder blades 19.6%, ribs 31.3% and flanks, 12.5% of the total carcass. We conclude that horse meat can be an excellent alternative for consumption for its high content in proteins and low levels of fat. It is also worth mentioning the higher losses for shrinkage due to the high content of humidity as well as the characterization of the yield at cutting.
  Gonzalez H.G. , D. Mota-Rojas , M. Becerril-Herrera , C.Casas-Garcia , M. Zermeno , R. Ramrez-Necoechea , J.A.Toca-Ramirez , C. Lemus , J. Toca-Ramirez and M. Alonso-Spilsbury
  In Mexico, equine use for meat production is not commonly found; the highest percentage of equine meat that can be possibly consumed comes mostly from culled animals. The objective of the present study was to characterize the slaughter performance and test the effect of gender in the incidence of injuries during transportation, in offals and hot carcass yields in twelve creole horses. Results indicate an average live weight of 296 Kg and carcass weight of 175 Kg, equivalent to 60% yield. It is possible that the husbandry method commonly used on pasturing the animals, decreased the thoracic development and increased the corporal length and diameter of the leg. With regard to slaughtering yield, red viscera represented 4.3%, green viscera 30%, skin 6%, limbs 2.8%, head 4.4% and loss at slaughter 1.5% of the total live weight. Average body condition in the horses was poor. No significant differences were observed between genders in the presence of injuries, although there was an influence of the arrival position on the severity of injuries; animals that were facing the direction of travel (rear-facing) showed injury 2 affecting subcutaneous and muscular tissues, whereas animals facing backward did not show injuries or these were not too severe.
  M.G. Nunez-Gutierrez , J.M. Tapia-Gonzalez , M. Becerril-Herrera , R. Ramirez-Necoechea , M. Alonso-Spilsbury and D. Mota-Rojas
  The objective of this study was to diagnose the risks of microbiological contamination in 3 meet products: Frankfurt type sausage, Virginia ham and dried salted pork, made in the meat processing plant at the University of Guadalajara. The influence from the physical infrastructure of the plant was evaluated such as the type and number of handlers, number of people present when the handling was carried out, as well as the time of manipulation and storage in refrigeration, the environmental conditions in processing areas and refrigeration and water from the municipal source (used to wash hands), equipment and utensils. Meat products with various preparation processes were chosen, individual microbiological tests for Salmonella, Escherichia coli and Staphylococcus aureus were made. The 90 point sanitary questionnaire was used to verify sanitation for physical risks in the processing plant. The results were analyzed using the EpiInfo® 2002 data base. There was a significant effect (p< 0.05) between independent variables, number of people coming in per day, and time of refrigeration with S. aureus present in the sampled food. Using standard comparison we observed that 100% of the products had some kind of microorganism. The installations complied entirely with the 90 point questionnaire by 23.08%, partially by 42.31% and was incompliant by 34.62%.
  M. Becerril-Herrera , C. Lemus-Flores , H.J.G. Herrera , M.Alonso-Spilsbury , R. Ramirez-Necoechea and D. Mota-Rojas
  The study was carried out with 13 Mexican Hairless (MHP) and 21 York-Landrace (Y-L) fattened pigs, randomly distributed in 4 treatments: 1) MHP under total confinement, 2) MHP in pasturing conditions, 3) Y-L in total confinement and 4) Y-L in pasturing conditions, all four groups were fed ad libitum. Morph metric growth in 63 days old pigs showed significant differences (p<0.0001) between breeds; however, at the end of the study (175 days old) significant differences were observed (p<0.05), both between breeds and between productive systems for the following variables: height at withers, hind- and fore- cane perimeters and snout length; indicating that the feeding system caused some hypertrophies in the organs mostly exercised. Results on the percentage of ileal apparent digestibility showed significant differences (p<0.001) between breeds and between productive systems too, whereas in the total apparent digestibility, differences between feeding-productive systems were only significant in the MHP. Results indicate that the MHP is a small size animal with thin limbs, these pigs show a great instinct for forage consumption but are unable to take advantage of this since they can not digest fiber, which ends with the myth that swine autochthonous breeds are able to digest fiber.
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