Obtención, evaluación y manipulación del semen de verraco en una unidad de producción mexicana

Córdova Izquierdo, A.; Pérez Gutiérrez, J.F.; Méndez Hernández, W.; Villa Mancera, A.E.; Huerta Crispín, R.: Obtención, evaluación y manipulación del semen de verraco en una unidad de producción mexicana. Rev. vet. 26: 1, 69-74, 201

Consecuencias del estrés calórico sobre la reproducción del ganado vacuno

Heat stress represents one of the major environmental factors that adversely affect the reproductive performance of cattle. In this paper the behavioral adjustments, physical mechanisms and physiological responses to heat loss are described; bos indicus adaptive advantages with respect to bos Taurus, pathophysiology of heat stress and heat stress effects in animal reproduction, both the male and the female.El estrés calórico representa unos de los principales factores del medio ambiente que repercuten negativamente en el desempeño reproductivo del ganado vacuno. En este trabajo se describen los ajustes conductuales, mecanismos físicos y respuestas fisiológicas para la pérdida calórica; ventajas adaptativas del bos indicus con respecto al bos Taurus, fisiopatología del estrés calórico y repercusiones del estrés calórico en la reproducción animal, tanto en el macho como en la hembra

Can bovine embryos be successfully transferred after 40 years of cryopreservation?

ABSTRACT Global advances in reproductive biotechnology have allowed for the transfer of embryos from donor females with high genetic merit to recipients using the cryopreservation technique, which preserves an embryo of excellent quality and viability, thereby achieving a feasible pregnancy rate. The objective of this study was to evaluate the quality and viability of Holstein embryos that have been cryopreserved for more than 40 years under glycerol freezing. The embryos were transferred to the recipient heifers using a non-surgical method. Two 17-month-old Holstein heifers (360 kg live weights) which were clinically healthy and reproductively active were used as the recipients. Two bovine embryos of Grade 1 quality were thawed and evaluated for their morphology. Of the two embryo transfers, one pregnancy was achieved, resulting in the birth of a calf. Therefore, embryos frozen in liquid nitrogen and glycerol as a cryopreservative for more than 40 years maintained their quality and viability to produce a live calf

Molecular characterization of occult hepatitis B virus infection in patients with end-stage liver disease in Colombia.

ABSTARCT: Hepatitis B virus (HBV) occult infection (OBI) is a risk factor to be taken into account in transfusion, hemodialysis and organ transplantation. The aim of this study was to identify and characterize at the molecular level OBI cases in patients with end-stage liver disease. METHODS: Sixty-six liver samples were obtained from patients with diagnosis of end-stage liver disease submitted to liver transplantation in Medellin (North West, Colombia). Samples obtained from patients who were negative for the surface antigen of HBV (n = 50) were tested for viral DNA detection by nested PCR for ORFs S, C, and X and confirmed by Southern-Blot. OBI cases were analyzed by sequencing the viral genome to determine the genotype and mutations; additionally, viral genome integration events were examined by the Alu-PCR technique. RESULTS: In five cases out of 50 patients (10%) the criteria for OBI was confirmed. HBV genotype F (subgenotypes F1 and F3), genotype A and genotype D were characterized in liver samples. Three integration events in chromosomes 5q14.1, 16p13 and 20q12 affecting Receptor-type tyrosine-protein phosphatase T, Ras Protein Specific Guanine Nucleotide Releasing Factor 2, and the zinc finger 263 genes were identified in two OBI cases. Sequence analysis of the viral genome of the 5 OBI cases showed several punctual missense and nonsense mutations affecting ORFs S, P, Core and X. CONCLUSIONS: This is the first characterization of OBI in patients with end-stage liver disease in Colombia. The OBI cases were identified in patients with HCV infection or cryptogenic cirrhosis. The integration events (5q14.1, 16p13 and 20q12) described in this study have not been previously reported. Further studies are required to validate the role of mutations and integration events in OBI pathogenesis

HORSES AN IMPORTANT SPECIE IN CHARRERIA, ITS MANAGEMENT AND WELFARE : Well-being in charro sport horses

The management practices provided to charrería horses in the state of Guerrero, Mexico were described and were related to animal welfare. Sixty-four owners of charrería horses were interviewed and 10% underwent an evaluation according to the protocol of the Welfare Quality ®. The most used breeds are Creole, Quarter Horse, Aztec, Spanish and Arabian. The starting age in charrería is 2 to 4 years, with workdays between two to four hours a day (81.2% of horses). Hoof shoeing is done every 8 to 12 weeks in 54.3%. The diet is based on forage and commercial feed (82.8%). Deworming is every six months (60.9%), 17.1% are vaccinated against tetanus, rabies, and influenza and very few owners (48.4%) request veterinary care. The most frequent diseases are digestive and locomotor, skin and respiratory. The stereotypes presented were rocking, nodding the head, kicking doors, chewing wood, and walking in circles. Body condition is good (3/5) (33.3%), fat (4/5) (33.3%), moderate (2/5) (16.6%) and Poor (1/5) in 16.6% of the animals. The majority had white hairs on their withers and back, because of injuries caused by their harnesses. The findings observed in the horses indicate that the welfare conditions were affected, which led to the development of vices, poor body condition, sick animals, and skin lesions in the animalsObjective: Describe the management practices provided to charrería horses in the state of Guerrero, Mexico and relate them to animal welfare. Design/methodology/approach: Sixty-four owners of charrería horses were interviewed and 10% underwent an evaluation according to the protocol of the Welfare Quality ® Results: The most used breeds are Creole, Quarter Horse, Aztec, Spanish and Arabian. The starting age in charrería is two to four years. Hoof shoeing is done every 8 to 12 weeks in 54.3%. The diet is based on forage and commercial feed (82.8%). Deworming is every six months (60.9%), vaccinated against tetanus, rabies, and influenza. The most frequent diseases are digestive and locomotor, skin and respiratory. The stereotypes were rocking, nodding, kicking doors, chewing wood, and walking in circles. Abundant body condition ranged from good to obese in the animals. The majority had white hairs as an indication of injuries caused by the harnesses. Limitations on study/implications: The lack of knowledge of the owners of horses dedicated to charro sport, to relate the five freedoms of well-being that must be given to every animal to improve their sporting performance, has caused problems in the animal’s life quality.  Findings/conclusions: The findings observed in the horses indicate that the welfare conditions were affected, which led to the development of vices, poor body condition, sick animals, and skin lesions in the animals

Composición nutricional, consumo e índices de palatabilidad relativa de los frutos de tres acacias en la alimentación de ovejas y cabras

El objetivo fue determinar la composición nutricional de los frutos de Acacia farnesiana, Acacia macilenta y Acacia cochliacantha y medir en las cabras y las ovejas el consumo de frutos (CF), el índice de palatabilidad relativo (IP) y su correlación con la composición nutricional de los frutos. Se utilizaron 16 hembras: 8 ovejas F1 Dorper X Pelibuey de 18,5 ± 1,5 kg de peso vivo y 8 cabras Criollas de 20,6 ± 1,8 kg de peso vivo. Los animales fueron alojados en corrales individuales (1,0 x 1,20 m) y se les ofreció a libre acceso los frutos de las tres acacias y rastrojo de maíz (RM) al mismo tiempo las 24 horas durante 15 días. El contenido de fibras detergentes ácida y neutra (P < 0,01), fenoles totales (FT) y taninos condensados (TC) (P < 0,01) fue diferente entre los frutos. Los frutos de A. farnesiana y A. cochliacantha fueron los más consumidos por las cabras (P < 0,01), y las ovejas consumieron más frutos de A. cochliacantha . En promedio el CF fue mayor en las cabras (P < 0,05), pero el IP fue mayor en las ovejas (P < 0,01). El CF y el IP tuvieron correlación positiva con el contenido de proteína (P < 0,01) y FT (P < 0,05) y negativa con el contenido de fibras detergentes ácida y neutra (P < 0,01). Se concluye que los frutos de A. farnesiana y A. cochliacantha tienen más valor alimenticio para ovejas y cabras por el menor contenido de fibras detergentes neutro y ácido y el mayor índice de palatabilidad observado

In Vitro Anthelmintic Activity of Methanolic Extract from Caesalpinia coriaria J. Willd Fruits against Haemonchus contortus Eggs and Infective Larvae

The aim of this study was to evaluate the in vitro lethal effect of a methanolic extract (ME) from Caesalpinia coriaria fruits against Haemonchus contortus eggs and infective larvae. The anthelmintic activity was assessed using the egg hatching inhibition assay (EHI) and the mortality test. The ME was assessed using five concentrations as follows: 6.15, 3.12, 1.56, and 0.78 mg/mL to eggs and 150, 100, 75, and 50 mg/mL to larvae, respectively. Ivermectin (5 mg/mL) was used as positive control and 4% methanol and distilled water were used as negative controls. The data of ovicidal and larvicidal effect were analyzed with a completely randomized design through ANOVA analysis using the general linear model (GLM) and lethal concentrations (LC50 and LC90) were estimated through a Probit analysis using the SAS program. A clear ME increased concentration dependence effect was observed in the EHI and mortality tests. The highest activity of the methanolic extract was observed at the highest concentration (P < 0.05) to obtain a similar effect to the positive control (ivermectin), with LC50 = 78.38 and 0.00064 mg/mL and LC90 =235.63 and 0.024 mg/mL, respectively, for larvae and eggs. The results indicate that the C. coriaria fruit ME possesses in vitro ovicidal and larvicidal properties (gallotannins: methyl gallate) against H. contortus that needs to be investigated more in vivo for the control of gastroenteric nematodes in ruminants

Identification of protective peptides of Fasciola hepatica-derived cathepsin L1 (FhCL1) in vaccinated sheep by a linear B-cell epitope mapping approach

Background: Fasciolosis is one of the most important parasitic diseases of livestock. The need for better control strategies gave rise to the identification of various vaccine candidates. The recombinant form of a member of the cysteine protease family, cathepsin L1 of Fasciola hepatica (FhCL1) has been a vaccine target for the past few decades since it has been shown to behave as an immunodominant antigen. However, when FhCL1 was used as vaccine, it has been observed to elicit significant protection in some trials, whereas no protection was provided in others. Methods: In order to improve vaccine development strategy, we conducted a linear B-cell epitope mapping of FhCL1 in sheep vaccinated with FhCL1, FhHDM, FhLAP and FhPrx plus Montanide and with significant reduction of the fluke burden, sheep vaccinated with FhCL1, FhHDM, FhLAP and FhPrx plus aluminium hydroxide and with nonsignificant reduction of the fluke burden, and in unvaccinated-infected sheep. Results: Our study showed that the pattern and dynamic of peptide recognition varied noticeably between both vaccinated groups, and that the regions 55–63 and 77–84, which are within the propeptide, and regions 102–114 and 265–273 of FhCL1 were specifically recognised only by vaccinated sheep with significant reduction of the fluke burden. In addition, these animals also showed significant production of specific IgG2, whereas a scarce non-significant production was observed in animals vaccinated with Aluminium hydroxide and no production was detected in infected control animals. Conclusions: We have identified 42 residues of FhCL1 that contributed to protective immunity against infection with F. hepatica in sheep. Our results provide indications in relation to key aspects of the immune response. Given the variable outcomes of vaccination trials conducted in ruminants to date, this study adds new insights to improve strategies of vaccine development

MOESM3 of The antibody response in the bovine mammary gland is influenced by the adjuvant and the site of subcutaneous vaccination

Additional file 3. Differences in least square means (Log 2 ) of Îą-toxin specific antibody isotype titers and neutralization titers