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Articles by Daniel Mota-Rojas
Total Records ( 4 ) for Daniel Mota-Rojas
  Daniel Mota-Rojas , Mar?a Alonso-Spilsbury , Lilian Mayagoitia Novales , Mar?a Elena Trujillo , Javier Valencia , Ramiro Ram?rez- Necoechea , Sa?l Cort?s and Isabel Escobar
  The objective of this study was to identify changes of the vaginal epithelium in Mexican hairless sows, which ovulated during lactation, caused by the effect of the boar presence and the litter withdrawal. In order to determine the oestrus stage, an exfoliative vaginal cytology and 17 estradiol and progesterone determinations were carried out on the 8 day after the onset of lactation out accompanied with behaviour observations. Four groups of sows were used: Group 1 was not stimulated; Group 2, remained with the boar; Group 3 was separated from its litter for 4 h and Group 4 got both stimuli. Vaginal smear samples were collected every 24 h. for 5 days after stimulus. An ANOVA statistical analysis was performed for repetitive samples during the 5 days of the test. Stimuli used in group 4 caused significant modifications (P< 0•001) when compared to Groups 1, 2 y 3. Estradiol levels were higher than 30 pg/ml in Group 4 on day 10 post partum and 4.5 ng/ml of progesterone on day 11 and 12 post partum. It was evident that 100% of the sows in Groups 1, 2 and 3 did not show oestral activity when relating vaginal cytology with the oestral behaviour and hormone determination of the lactating sows, whereas 100% of the sows in group 4 presented oestrus 72 h. after the stimulus and ovulated 24 to 36 h after the oestrus onset, this was corroborated by estradiol and progesterone determinations, respectively.
  Ma.L. Alonso-Spilsbury , F. Clemente Lemus , R. Ram?rez- Necoechea and Daniel Mota-Rojas
  Traditionally, Mexican Hairless pigs had been discriminated and replaced by genetic improved breeds due to their poor performance; nevertheless, their importance is double since the meat improves the peasants? diet while the income received by fattening and selling the pigs creates an economy base for the communities. Currently there are interdisciplinary efforts to study this biotype, some of them are guided to raise the pigs at different confinement systems. In this study two Mexican Hairless herds kept on grazing conditions in two climates were analyzed and compared. Results show that the two herds under study had similar performances. Also, there were similarities of our results with others in variables like litter size (6.16?2.78), piglets born alive (5.66?2.31), stillbirths (5.66?2.31), litter weight (5.99?2.45) and individual weight at birth (1.09?0.27), therefore we conclude that there is no artificial selection in this biotype. The number of farrowings per sow per year varied from 1.06 to 2.75, showing that females? reproductive performance could be improved if the sows become pregnant while still nursing, taking advantage of the lactational estrus.
  Marcelino Becerril-Herrera and Daniel Mota-Rojas
  The use of kitchen waste or leftovers in animal feeding is limited basically by its high nutritious variability and for sanitary reasons; although it represents an option in the artisan pig raising system, its effect on the carcass quality has not been evaluated yet. In this study 50 hybrid pigs from a family pig farm were evaluated; animals were distributed by sex at random: T1: 15 females and T2: 15 castrated males, both groups fed with left-overs; T3: 10 females and T4: 10 castrated males, fed with balanced commercial food. Tukey test was used to determine significant differences between the treatments?. Pigs fed with leftovers had less height and less corporal length and a high leg development; an increase in the backfat covering and smaller development of the Longissimus dorsi muscle as well. Besides, these animals had carcasses of smaller length, compared with pigs fed with balanced commercial feed, which showed carcasses of better quality, as well as higher values in the viscera. Contrary to what was expected, in barrows fed with kitchen leftovers the backfat deposition was favored in comparison with the females fed in the same way.
  Daniel Mota-Rojas , Maria Elena Trujillo-Ortega , Dina Villanueva-Garcia , Miguel Gonzalez-Lozano , Hector Orozco-Gregorio , Ramiro Ramirez-Necoechea , Adriana Olmos-Hernandez and Maria Alonso-Spilsbury
  Stillbirths in large-scale porcine farms are still a problem reducing the reproductive performance. Oxytocin and vetrabutin chlorhydrate are the uterotonics frequently used with the purpose to accelerate the labor in sows of different countries, including Mexico. Currently, there is controversy if uterotonic drugs use increase or not the survival of the newly born porcine. The objective of this review is to comment the schemes of treatment used with oxytocin and vetrabutin chlorhydrate and their effects on mortality due to postnatal and intrauterine asphyxiation and discuss the uterotonics schemes of treatment that have tried to resolve it as well. We conclude that it is necessary to establish the pros and contrast of the use of oxytocin and vetrabutin chlorhydrate and the uterotonics treatment schemes to stop their indiscriminate use and overdosage because of a lack of standardized dose protocols, routes of administration and times of application during farrowing, which increase the risk of perinatal mortality.
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