Evaluation of the effect of centromeric heterochromatin polymorphism on pig fertility

C-banding identified centromeric heterochromatin polymorphism, most often located in pair no. 16, was a basis for selecting animals for the experiment. The aim of the experiment was to assess the impact of centromeric heterochromatin polymorphism on pig fertility, expressed by litter size. The research included the first two litters obtained from 30 pairs of parents with different genotypes as regards the parameter under study. A statistical analysis of the number of offspring from different mating types showed no significant differences between the experimental groups of animals. The results obtained did not confirm suggested correlation between polymorphism of the centromeric heterochromatin regions and pig fertility, estimated by mean litter size. Thus the polymorphism cannot be regarded as a selection criterion

Decrease in pig fertility as a result of reciprocal translocations and associated economic effects on the basis of rcp [7;13][q13;q46]

Reciprocal translocations, very frequently identified in pigs, are the cause of fertitlity decrease. The aim of this work was to provide an objective assessment of the real effect of reciprocal translocation (7;13) on the fertility of carriers and associated economic effects. The experiment has shown that fertility, expressed as a mean litter size, decreased by 48% in comparison to that of the control group. On the basis of simulation account, financial losses incurred a translocation - as a result of using carrying boar in a commercial herd were estimated at about 8,000 USD for natural mating and at about 162,000 USD for artificial insemination. The results obtained show the need for introducing a system for cytogenetic control of boars producing small litters into the Polish swine improvement programme

Identificación preliminar de la reorganización del par cromosómico 1 en porcinos Landrace polacos

Se identificó una reorganización en el par cromosómico 1 de la raza Landrace Polaco mediante las metodologías de bandeo HRBT - RBA, GTG y CBG. Comparando la ordenación de las bandas de los cromosomas elongados con los patrones desarrollados para cromosomas prometafásicos porcinos, se localizaron puntos de ruptura en las cromátidas del par 1. La reorganización fue provisionalmente diagnosticada como una inversión pericéntrica inv/1// p 2.2.2.1.;q 1.1./. La cerda portadora de la anomalía se caracterizó por un fenotipo correcto. Sus características reproductivas, valoradas en función del tamaño medio de camada no diferían del tamaño medio de camada en su lote