Universidad Nacional Agraria La Molina. Escuela de Posgrado. Doctorado en Ciencia Animal

The genomes of 41 bovines of five breeds, existing in the SRA-NCBI database, were used to identify 17 single nucleotide polymorphisms (SNPs) which generate non-synonymous mutations in 10 hypoxia-inducible genes. Of this, only three SNPs located in positions c.1081G>C, c.2089G>A and c.2101G>A of exons 7 and 12 of the EPAS1 gene had different allelic frequencies between beef and dairy cattle (p<0.05). Based on the results of the bioinformatic analysis of the genomes, exonic regions of the EPAS1, NOS2, EPO and VEGFA genes were chosen, which were studied in 60 DNA samples from Creole and Brown Swiss cattle raised in the high Andean region (3213-4309 m above sea level). The cattle were grouped by their haemoglobin concentration (Hb) in Brown Swiss with high Hb (BSHbA) (n=13), Brown Swiss with low Hb (BSHbB) (n=11), Creoles with high Hb (CRHbA) (n=13) and Creoles with low Hb (CRHbB...

The aim of this study was to evaluate the dynamics of growth and nutritional value of Pennisetum spp (cv. Maralfalfa) at three cutting ages (45, 60 and 75 days) and at two times of the year (high and low rainfall) in the district of Oxapampa, Pasco, Peru. Plant height to flag leaf (AH), number of tillers (NT), green biomass (BV), dry matter (DM), in vitro digestibility of dry matter (DIVMS), crude protein (CP), crude fibre (CF), calcium (Ca) and phosphorus (P) were evaluated in a completely randomized design with a 3x2 factorial arrangement (cut-off age and time of year). The AH did not present significant differences for age at cutting (34.27±4.00, 210.08±4.00 and 251.14±4.00 cm for 45, 60 and 75 days, respectively), nor between seasons (191.91±3.26 and 205.09±3.26 cm in low and high precipitation, respectively). The NT did not show significant differences for age at cutting (54.56...