The aim of the study was to evaluate the supplementation of dry brewery by-products and mineral salts (Fosvimin®) in milk yield of crossbred cows in the Pucallpa area, Peru. Three groups of six cows each were used. Cows were at various phases of lactation and had various degree of crossbreeding, but with zebu predominance. The treatments were: T1 = naturalized pasture (PN), T2 = PN + 5 kg of brewery residue (Os) and T3 = PN + Os + 100 g/cow of mineral salt. The three groups of cows were confronted with the three treatments for periods of 10 days, in a randomized complete block design, where daily milk yield was recorded between days 6 and 10 of each period. Supplements of T2 and T3 were provided during milking. The available forage of the naturalized pasture was 2207.6 kg/ha of dry matter. The milk production in T1, T2 and T3 was 4.5, 4.3 and 4.8 l/cow/day respectively, showing signific...

The purpose of this study was to evaluate the yield of dry matter (DM), crude protein (CP) and in vitro digestibility of dry matter (IVDMD) at four cutting heights and five maturity times of Pennisetum sp (Maralfalfa) during the periods of greatest and least precipitation in Pucallpa, Peru. Cuts were made at 0, 10, 20 and 30 cm height from the ground at 28, 35, 42, 49 and 56 days of regrowth. Plant height, number of stems, number, length and width of leaves, DM, CP and IVDMD yield were evaluated under a complete randomized design with a 4x5 factorial arrangement and 4 repetitions. The plant reached 120.5 cm in height at 56 days of regrowth. At the beginning of the growth period, it had 28 stems and 127 leaves, decreasing until it was established on 15 stems and 58 leaves after 56 days. In that same period the leaves grow up to 77.9 cm long and 2.3 cm wide. The DM performance increases wh...

El propósito del estudio fue evaluar la suplementación de residuo seco de cervecería (orujo) y sales minerales (Fosvimin®) en la producción de leche de vacas cruzadas en la zona de Pucallpa, Perú. Se utilizaron tres grupos de seis vacas en diferente fase de lactación y de diverso grado de cruzamiento, pero con predominancia cebú. Los tratamientos fueron: T1 = pastura naturalizada (PN), T2 = PN + 5 kg de orujo seco de cervecería (Os) y T3 = PN + Os + 100 g/vaca de sal mineral. Los tres grupos de vacas fueron enfrentados a los tres tratamientos por periodos de 10 días, en un diseño de bloques completos al azar, donde la producción de leche fue medida entre los días 6 y 10 de cada periodo. Los suplementos de T2 y T3 fueron proporcionados durante el ordeño. El forraje disponible de la pastura naturalizada fue de 2207.6 kg/ha de materia seca. La producción de leche en T1, T2 y ...

The aim of this study was to determine the frequency and load of ectoparasites in gills of cachama fry from three semi-intensive farming fish farms in the province of Coronel Portillo, Ucayali, Peru. Sixty fingerlings (35-45 days old) were selected from each of the three fingerling supply establishments (E1, E2 and E3), reared at similar density and feeding conditions. Three fresh gill layer sections were evaluated from both sides, by visual observation with a 2x magnifying glass to detect crustaceans and by direct microscopy at 10x for trematodes and at 40x for protozoa. Four degrees of infestation were considered; null (0 parasites), mild (1-3), moderate (4-7) and severe (>8). It was possible to identify mainly forms compatible with monogeneans of the Dactylogyridae family, compatible with Dactylogyrus spp (41.1%) and protozoa, mostly of the Oodiniaceae family, compatible with Pisci...

The aim of this study was to determine the frequency and load of ectoparasites in gills of cachama fry from three semi-intensive farming fish farms in the province of Coronel Portillo, Ucayali, Peru. Sixty fingerlings (35-45 days old) were selected from each of the three fingerling supply establishments (E1, E2 and E3), reared at similar density and feeding conditions. Three fresh gill layer sections were evaluated from both sides, by visual observation with a 2x magnifying glass to detect crustaceans and by direct microscopy at 10x for trematodes and at 40x for protozoa. Four degrees of infestation were considered; null (0 parasites), mild (1-3), moderate (4-7) and severe (>8). It was possible to identify mainly forms compatible with monogeneans of the Dactylogyridae family, compatible with Dactylogyrus spp (41.1%) and protozoa, mostly of the Oodiniaceae family, compatible with Pisci...