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Search Results: 1 - 10 of 198674 matches for " D. Mota-Rojas "
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Effects of Additional Space During Transport on Pre-slaughter Traits of Pigs
M. Becerril-Herrera,D. Mota-Rojas,I. Guerrero-Legarreta,M. Gonzalez-Lozano
Journal of Biological Sciences , 2007,
Abstract: The objectives of the present study were to evaluate the effects of increasing space in transportation at different distances, on live weight loss in pigs and to determine the effects of fasting and pre-slaughter lairage period on both live and carcass weights by sex and on pork quality. Seven hundred and twenty pigs Pietrain x (YorkshirexLandrace) were divided into two experimental conditions (EC1 and EC2). EC1 pigs were divided in three groups of 120 animals each and were transported for 8, 16 and 24 h (loading density: 0.35 m2/100 kg). EC2 pigs were divided in three groups of 120 animals, the transport duration was the same as in EC1 (loading density: 0.68 m2/100 kg). Transport duration and space allowance significantly affected (p< 0.01) the posture of the pigs on arrival to the slaughterhouse; there were significant differences (p< 0.01) between genders. When transport time was shorter, a higher number of pigs arrived in a standing posture, more females arrived in a standing position in the group shipped for 8 h. Pig position affected carcass yield, when transportation time was shorter carcass yield was higher. There was a higher percentage (p< 0.01) of pigs at pH 5.8-6.2 in animals transported for 8 h, compared with 16 and 24 h period, independently of the space allowance. Additional space provided to pigs during transportation lead to a better animal welfare in transit and had no decisive influence in the quality of the carcass; nevertheless, the quality of meat improved.
Equine Carcasses: Nutritional Analysis, Shrinkage and Cutting Performance
M. Becerril-Herrera,M. Zermeno,D. Mota-Rojas,G.H. Gonzalez
Journal of Biological Sciences , 2006,
Abstract: 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.
The Axolotl (Ambystoma mexicanum): Factors That Limit its Production and Alternatives for its Conservation
M. Sciences-Hernandez,M. Soriano-Lopez,D. Mota-Rojas,A. Vergara Iglesias
International Journal of Zoological Research , 2006,
Abstract: 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.
Feeding Kitchen Leftovers to Fattening Pigs Effects on Health and Production Performance
D. Mota-Rojas,M. R. Becerril-Herrera,H. J. Herrera,C. Noriega,M. Alonso-Spilsbury
Journal of Food Technology , 2013,
Abstract: The use of kitchen leftovers as a feeding source in pigs has quality limitations as well as health and sanitary restrictions; nevertheless, it is still the only affordable food for some artisan pig farms. Production performance in hybrid pigs at an artisan farm in the State of Mexico, was studied. Four treatments (T1-T4) were administered to 50 hybrid pigs distributed at random as follows: T1 had 15 sows and T2, 15 castrated male pigs, both groups were fed with kitchen leftovers; T3 had 10 sows and T4, 10 castrated male pigs; these latter groups were fed with a commercial balanced feed. In order to analyse the differences between the means of the treatments a Tukey test was used. Proximal analysis showed the low nutritional quality of the leftovers. Animals fed with kitchen waste showed a higher percentage of respiratory and enteric signs that affected the muscular tissue development. Furthermore, leftovers increased feed conversion compared to the balanced diet. Treating the kitchen waste is recommended in order to diminish the pathogen incidence, and adding protein to the diet which will guarantee the fulfillment of animal nutritional needs. It is true that feeding with leftovers is cheap but it is convenient to take into account the cost involved which includes growth delay and both respiratory and digestive problems in animals.
Lactational Estrus in Sows, a Way to Increase the Number of Farrowings Per Sow Per Year
M. Alonso-Spilsbury,L. Mayagoitia,M.E. Trujillo,R. Ram?rez- Necoechea,D. Mota-Rojas
Journal of Animal and Veterinary Advances , 2012,
Abstract: During lactation the sow generally remains anestrus. However, lactational estrus and ovulation sometimes occurs under unusual circumstances. Practical outcomes of lactational estrus are reducing the interval between weaning and estrusand therefore the non-productive days in the herd. Although various techniques to induce lactational estrus have been performed through natural management of the animals or the use of exogenous hormones during lactation, induction of estrus during lactation has not been recommended for commercial use. The objective of this study was to review and analyze the basic lactating sow physiology and the different methodologies to induce lactational ovulation, in order to improve her reproductive and productive performance, as a possible alternative to the early weaning system, especially in those cases where lactation length is determined by welfare constraints.
Welfare at Slaughter of Broiler Chickens: A Review
D. Mota-Rojas,M.J. Maldonado,M.H. Becerril,S.C.P. Flores
International Journal of Poultry Science , 2008,
Abstract: Currently, poultry plants are sacrificing between 140 to 180 broilers per minute; sometimes animals are not sacrificed properly, which makes manual sacrifice necessary. In the present study a review is provided on the most relevant aspects regarding different methods used for chicken sacrifice, these methods are analyzed and a comparison with Mexican regulations is given regarding the humanitarian sacrifice of domestic birds for human consumption. We conclude that the main objective of broiler sacrifice should be the well-being of the animal, it must also be economic, practical and safe for workers. In Mexico, research must be developed to justify adequate use of sacrificial methods and its effect on the quality of poultry meat such as ostrich, turkey and quail.
Aplicación de somatotropina recombinante porcina en lechones durante la primera semana de vida: efecto sobre variables metabólicas y somatométricas
Olmos-Hernández,A; Trujillo-Ortega,ME; Alonso-Spilsbury,M; Becerril-Herrera,M; Hernández-González,R; Mota-Rojas,D;
Archivos de medicina veterinaria , 2010, DOI: 10.4067/S0301-732X2010000200011
Abstract: the aim of this study was to evaluate the effect of porcine recombinant somatotropin (rpst) administered to piglets during their first week of life, on metabolic and somatometric variables. a total of 220 piglets born from 40 hybrid landrace x large white sows were used. piglets were randomly assigned to either group 1 (g1, control, n = 106) or group 2 (g2, rpst treatment, n = 114). the rpst dose was 1mg/kg every 24h during 7 consecutive days. serum ph at birth showed significant differences between groups (7.42 ± 0.47 and 7.31 ± 0.59), although this difference dissapeared on day 8. there was a significant increase (p < 0,001) in plasma glucose levels for the treated group on day 8 (68.78 ± 10.44 and 103.71 ± 18.44). average daily weight gain was also higher for the somatotropin treated group compared to the control (137.25 ± 31.31 and 209.21 ± 45.97). comparisons for interaction between treatment and sex showed dramatic differences (p < 0,001) for glucose, lactate and weight gain for the males from g2 when compared to the females from the same experimental group on day 7 post-treatment. piglets treated with rpst showed significant differences in abdominal perimeter (28.67 ± 4.41 and 31.79 ± 3.74), dorsal length (28.42 ± 2.66 and 30.21 ± 4.70), and ham roundness (18.79 ± 2.62 and 22.38 ± 2.98). there is an ongoing research that will allow to determine the composition of body mass (bone or muscle) in the treated piglets.
Leptospirosis Seroconversion During an Abortion Outbreak in a Mexican Hairless Swine Herd
M. A. Cisneros-Puebla,D. Mota-Rojas,L. P. Moles-Cervantes,R.Ram?rez-Necoechea,M. Alonso-Spilsbury
Journal of Animal and Veterinary Advances , 2012,
Abstract: A herd of Mexican Hairless Swine, maintained in an agro-silvi-culture pasture in the village of Chapa de Mota, Mexico, underwent a serological study after one of the sows aborted a litter showing fever. Blood samples were drawn from thirty-four animals in reproductive stage, which then underwent a treatment, based on a streptomycin dose of 25 mg/kg live weight during five days. Twenty-eight samples were taken 15 days after the herd either farrowed or aborted. Seroconversion was found in five animals with a serovar of hardjo H 89 origin. One of the animals aborted after seventy-eight days of gestation; in all the cases there was a negative increase of between 1:200 to 1:800 titres, while the serovar bratislava presented titres in six animals. In two cases the seroconversion went from a negative to a 1:200, while one of the pigs miscarried on the 77th day of pregnancy, and two other animals went from a titre 1:100 to 1:200. Another sow lost a litter on day 84, and in the last two animals the titre was maintained at 1:100, though one of the pigs aborted on the 86th day. This paper constitutes the first report of an outbreak of abortions in the Mexican Hairless Swine caused by Leptospira interrogans serovars bratislava and hardjo.
Effects of Pre-Slaughter Transport, Lairage and Sex on Pig Chemical Serologic Profiles
D. Mota-Rojas,M. Becerril Herrera,M.E. Trujillo-Ortega,M. Alonso-Spilsbury,S.C. Flores-Peinado,I. Guerrero-Legarreta
Journal of Animal and Veterinary Advances , 2012,
Abstract: 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.
Piglet Survival in Early Lactation: A Review
M. Alonso-Spilsbury,R. Ramirez-Necoechea,M. Gonzlez-Lozano,D. Mota-Rojas,M.E. Trujillo-Ortega
Journal of Animal and Veterinary Advances , 2012,
Abstract: 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.
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