Morphological description of gametes in cave and surface populations of (De Filippi, 1853).

The Mexican tetra presents two contrasting morphs, a widely distributed surface morph and a cave-adapted morph. These cave-adapted morphs have evolved independently from two different lineages (i.e.

Milk yield did not decrease in large herds of high-producing Holstein cows in semi-arid climate of Mexico.

This study aimed to determine the trends in milk production, fertility, temperature-humidity index (THI), and herd size in dairy herds from the Laguna region in northern Mexico. Records of 16 dairy herds of Holstein cows from January 2002 to December 2016 were used. Milk production was categorized in low and high levels.

Mitochondrial DNA sequence analysis of the Mexican Creole sheep (Ovis aries) reveals a narrow Iberian maternal origin.

The Creole sheep in America is supposed to have originated specifically from the Iberian Peninsula and introduced by the Spaniards during the colonization. However, it is not clear their genetic relationship with Iberian breeds. The genetic origin and diversity of the Mexican Creole sheep (MCS) were investigated by mitochondrial DNA control region nucleotide sequences.

Proteolytic activity of extracellular products from Arthrobotrys musiformis and their effect in vitro against Haemonchus contortus infective larvae.

Arthrobotrys musiformis is a nematophagous fungus with potential for the biological control of Haemonchus contortus larvae. This study aimed to identify and demonstrate the proteolytic activity of extracellular products from A musiformis cultured in a liquid medium against H contortus infective larvae. A musiformis was cultured on a solid medium and further grown in a liquid medium, which was then processed through ion exchange and hydrophobic interaction chromatography.

Genotyping of infectious pancreatic necrosis virus isolates from Mexico state.

The infectious pancreatic necrosis virus (IPNV; genus Aquabirnavirus) affects salmon and trout, causing high mortality in first-feeding fry. The classification of this virus includes nine serotypes and seven genogroups. In Mexico, two different isolates were identified in 2000 and 2008, respectively.

Association between major histocompatibility complex microsatellites, fecal egg count, blood packed cell volume and blood eosinophilia in Pelibuey sheep infected with Haemonchus contortus.

The objective of this study was to assess the correlation among traits associated with resistance or susceptibility to Haemonchus contortus infestation and to evaluate the participation of the ovine major histocompatibility complex (MHC) in Pelibuey sheep, a prevalent breed in tropical and sub-tropical regions in Mexico and elsewhere. Association among the fecal egg count (FEC), blood packed cell volume (PCV), antibody (AB) levels, serum proteins (SP) and blood eosinophil count (EOS) was assessed in 52 lambs experimentally infected with H. contortus, and the participation of the MHC was evaluated using polymorphisms in three microsatellites, located at the class I (OMHC1) and class II (OLADRB1, OLADRB2) regions of the MHC.

Molecular characterization of the VP1 gene of a Mexican isolate of infectious pancreatic necrosis virus.

The presence of infectious pancreatic necrosis virus (IPNV) in salmonids predominantly produces a high mortality rate in first-feeding fry. Genomic analysis of the vp2 gene sequence is most commonly used to determine the genetic diversity of IPNV isolates. Recently, information obtained from the vp1 gene allowed for efficient analysis of the genetic diversity of IPNV.

Blood group O alleles in Native Americans: implications in the peopling of the Americas.

All major ABO blood alleles are found in most populations worldwide, whereas the majority of Native Americans are nearly exclusively in the O group. O allele molecular characterization could aid in elucidating the possible causes of group O predominance in Native American populations. In this work, we studied exon 6 and 7 sequence diversity in 180 O blood group individuals from four different Mesoamerican populations.

Histopathologic study of long-bone growth plates confirms the basset hound as an osteochondrodysplastic breed.

Osteochondrodysplasias are caused by abnormal development and growth of cartilage and bone. These abnormalities have been reported in both humans and animals with dwarfism. The basset hound is considered a breed with a disproportionate prevalence of dwarfism, the cause of which is unknown.