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Observaciones sobre fertilidad comparada y efecto de la inseminación artificial sobre la Trichomoniasis en vacunos lecheros
(Instituto Interamericano de Ciencias Agrícolas (IICA), 1962-01-01)Comparisons are made on fertility of dairy cattle before and after the introduction in 1957 of artificial insemination Fertility was good in Criollo cattle under natural conditions, until there was a drop due to the presence ... -
El problema del crecimiento estacional del bovino en clima tropical
(Instituto Interamericano de Ciencias Agrícolas (IICA), 1962-01-01)Even in the humid tropics such as Turial. D ba, where grasses are green throughout the year, marked seasonallity in weight increase in young cattle was observed This is ascribed to seasonal changes in the feeding value of ... -
Leguminosas en los pastizales de Costa Rica
(Instituto Interamericano de Ciencias Agrícolas (IICA), 1962-01-01)A list is given of the numerous species found in grasslands in Costa Rica. They constitute from 5 to 25 percent of the forage produced in some of the better pastures Attention is called to the probable use fulness of the ... -
La utilización de sangre de razas europeas y zebú para producción de leche en América Tropical
(Instituto Interamericano de Ciencias Agrícolas (IICA), 1962-01-01)Comparisons have been made for ten year performance of Jersey cows and two generations of halfbred Jersey x Zebu, and Brown Swiss x Zebu, at Turrialba. Results up to now indicate that for animals fed on tropical grasses ... -
Pruebas de toros en el mejoramiento del ganado criollo lechero tropical
(Instituto Interamericano de Ciencias Agrícolas (IICA), 1962-01-01)Progeny tests were made with four Criollo bulls, based on milk and butterfat praduction in the first calving of their daughters Results show that the indexes are similar to those obtained from the best bull of a previous ... -
Eficacia del aldrin, dieldrin y heptachlor en el combate del picudo del tubérculo de la papa, Premnotrypes vorax (Huctache) (coleóptera: Curculionidae) en Ecuador
(Instituto Interamericano de Ciencias Agrícolas (IICA), 1962-01-01)A test was conducted at Chimborazo province, Ecuador, on control of the Irish potato weevil, Premnotrypes vorax (Huct.), one of the principal insect pest of this crop The insecticides tested were Aldvin, Dieldrin and ... -
Aumentos de peso de la vaca lechera durante su periodo seco
(Instituto Interamericano de Ciencias Agrícolas (IICA), 1963-04)Daily weight gains of Criollo cows on pastures during their dry period were tabulated at Turrialba. Greatest gains were recorded during the period May to July. This is not the period of heaviest rainfall. It is suggested ... -
Influencia de la estabulación sobre la producción de leche en vacas pastoreadas en pasto Pangola
(Instituto Interamericano de Ciencias Agrícolas (IICA), 1963-04)Groups of cows mantained on Pangola grass pastures were subjected to nocturnal and diurnal stall feeding. Night stabling increased milk production, over continuous grazing, not so the day stabling. It is suggested that ... -
Studies on the effect of mulch and irrigation on root and stem development in Coffea arabica L. I. Changes in the root system induced by mulching and irrigation
(Instituto Interamericano de Ciencias Agrícolas (IICA), 1963-04)Se describen los efectos del mantillo (mulching) y del riego sobre el desarrollo de las raíces en árboles de 20 años de Coffea arabica L. cultivados en Lyamungu, Tanganyika. La profundidad de penetración de las raíces ... -
La antracnosis del plátano "cachaco" en el Tolima
(Instituto Interamericano de Ciencias Agrícolas (IICA), 1963-04)A disease damaging the fruit of “cachaco” plantains, Musa balbisiana Colla, was identified as anthracnose caused by the fungus Gloeosporium musarum (perfect state Glomerella cingulata) The disease originates mainly through ...