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Objective. Determine chromosomal aberrations such as aneuploidies/polyploidies (ap/pp) of cows with a history of abortion from a municipality in Zacatecas, Mexico. Materials and methods. 107 blood samples were collected from cows with a history of abortion and ages between 3 and 10 years in the municipality of Enrique Estrada Zacatecas Mexico, a chromosomal analysis was performed with the conventional cytogenetic technique, to determine chromosomal aberrations such as aneuploidies/ polyploidies. Results. The ap/pp cows range from those that did not present any aberrations (0%), a median of (2%) and a maximum of (16%) chromosomal aberrations, the recorded age of the cows was a minimum of 3.5 years, a median of 5.8 and a maximum of 7.4. With these results it can be predicted that there is the possibility that with each year a cow will abort and it increases by 31.7%. However, the p of this coefficient is 0.384—not significant. On the other hand, the possibility of a cow aborting increases by 16.5% with each unit percentage increase in the degree of polyploidy, and the p for this coefficient is 0.029, which is significant. Conclusions. Aneuploidies/polyploidies in correlation with the age of the cows are a possible probability of abortion. [ABSTRACT FROM AUTHOR]

Objective. To identify Escherichia coli 0157:H7 present in diarrheal feces of lactating ruminants with diarrheal syndrome and safety of colostrum intake. Materials and methods. A feces sampling of 316 ruminants was carried out during the period of August 2015 to March 2016 in the municipalities of Río Grande, General Enrique Estrada, Morelos and Calera de Victor Rosales of the state of Zacatecas, obtained from 67 cattle, 183 sheep and 66 goats. Results. The following were identified in CHROMagarTM chromogenic medium: 260 coliforms, 78 Escherichia coli 0157:H7, 16 Proteus spp. and 25 colonies of unidentified bacteria, finding an incidence of Escherichia coli 0157:H7 of 22.03% in the four municipalities. Conclusions. Escherichia coli 0157:H7 is the second bacteria found in ruminant feces with an incidence of 22%, which is a mortality risk factor in lactating ruminants (less than 21 days old), causing economic loss and health risk for the population of the state of Zacatecas. [ABSTRACT FROM AUTHOR]