Universidad Nacional Agraria La Molina. Escuela de Posgrado. Maestría en Producción Animal

The objective of the present study was to analyze the effect of three factors as type of seed, seed density and crop fertilization on the yields of commercial sweet potato roots cv. Jonathan. Four variables were analyzed: total root yield, commercial roots yield, non-commercial root yield and total dry matter. The experiment design was a randomized complete block factorial arrangement 2Sx2Dx2F, with two levels in each factor: common seed and basic seed, 20 cm and 40 cm spacing between cuttings, low and medium fertilization. The results showed that there is no interaction among the factors evaluated. The average planting density factor was statistically higher in all treatments with the spacing of 20 cm between cuttings; both commercial roots yield and other variables evaluated. In all treatments, commercial yield ensured the economic return of production, T5 treatment (basic seed, 20 cm ...

We report 2 novel autosomal translocations in the horse. In Case 1, a breeding stallion with a balanced t(4p;30) had produced normal foals and those with congenital abnormalities. Of his 9 phenotypically normal offspring, 4 had normal karyotypes, 4 had balanced t(4p;30), and 1 carried an unbalanced translocation with tertiary trisomy of 4p. We argue that unbalanced forms of t(4p;30) are more tolerated and result in viable congenital abnormalities, without causing embryonic death like all other known equine autosomal translocations. In Case 2, two stallions produced by somatic cell nuclear transfer from the same donor were karyotyped because of fertility issues. A balanced translocation t(12q;25) was found in one, but not in the other clone. The findings underscore the importance of routine cytogenetic screening of breeding animals and animals produced by assisted reproductive technologie...