Luis Alberto RaggiUniversity of Chile · Departamento de Biología
Luis Alberto Raggi
About
19
Publications
2,669
Reads
How we measure 'reads'
A 'read' is counted each time someone views a publication summary (such as the title, abstract, and list of authors), clicks on a figure, or views or downloads the full-text. Learn more
246
Citations
Publications
Publications (19)
San Pedro de Atacama, ubicado en la Región de Antofagasta, es la cuna de la cultura Atacameña, la que habita desde al menos 5.000 años a.C. en esta región, estando siempre ligada a los Camélidos Sudamericanos (CS), dedicándose a la caza en un comienzo, razón por lo cual sus tribus eran nómades pues seguían a las manadas en busca del sustento. Luego...
Because the etiologic agents are mainly multi-resistant bacteria, the treatment of nosocomial infections is increasingly complicated. In addition, because bacterial resistance is encoded by genes, it becomes necessary to know and update their frequencies and to guide the control of antimicrobial resistance in hospitals. Currently, the Polymerase Ch...
Fetal weight and the placenta of sheep at high altitude (HA) are affected by hypoxia. Placental changes (an increase in placental size and vascularization) are greater in ewes from populations that have lived for several generations at HA than in those exposed during just 1 gestation. This study investigated placental expression of vascular endothe...
Fetal growth and newborn weight from ovine gestations at high altitudes (HA) are greater in ewes that live at HA for several generations than in those native to low altitudes (LA) exposed to HA only during pregnancy. Because the placenta is a key regulator of fetal growth, the present study compared placental characteristics in term pregnancies amo...
The present studies assessed the effect of hypobaric hypoxia on fetal lamb growth in high-altitude (HA) and low-altitude (LA) native ewes. Growth patterns of fetal biparietal diameter (BPD), abdominal diameter (AD) and thorax height (TH) were described by consecutive ultrasound measurements throughout the entire pregnancy. Three groups of animals w...
El objetivo de este estudio fue determinar la influencia de diferentes condiciones medioambientales (calidad de los pastos y altura) sobre la composición del calostro y la leche de alpacas,durante los primeros cinco meses de lactación.Los principales componentes de la leche fueron determinados y comparados entre alpacas en lactación mantenidas en d...
Sixty-three pregnant llamas of known breeding date were used in this study. Forty-six of them were submitted to surgery between 186 and 320 days of gestation (52-91% of average gestation period, respectively). Under general anesthesia their fetuses were exteriorized and fetal weight (W), biparietal diameter (BPD) and femoral (F), tarsus-hoof (T-H),...
Fetal biparietal diameter (BPD) and thorax height (TH) were measured by ultrasound during intrauterine growth in pregnant llamas (Lama glama) and alpacas (Lama pacos). The goal was to establish representative curves that allows estimation of gestational age (GA) from real-time ultrasonic measurements of these fetal structures at any stage of gestat...
Plasma progesterone concentration during pregnancy and the early postpartum period was measured by radioimmunoassay in five alpacas (Lama pacos), of the Huacaya breed, whose pregnancy length had a mean of 344.8 +/- 4.4 days. Concentration of progesterone increased (P < 0.001) from low premating values (0.11 +/- 0.06 nmol/l) to greater values at 30...
An ultrasonography study of early pregnancy diagnosis was carried out in 19 alpacas and 12 llamas, after controlled matings. The aim was to determine the earliest gestational age at which pregnancy diagnosis by transrectal ultrasonography could be achieved, and to generate an empirical formula for gestational sac diameter (GSD) growth as a function...
El propósito del presente trabajo es realizar una caracterización fisiológica de la alpaca en el ambiente del altiplano chileno. considerando la posible influuencia de las variaciones diurnas. Se utilizaran 30 animales adultos, machos y hembras, provenientes de tres rebaños ubicados entre los 4400 y 4600 metros sobre el nivel del mar. Los animales...
Frente al creciente interés por la cría de alpacas en zonas geográficas diferentes a su hábitat natural, la región del altiplano, se evalúa la respuesta adaptativa de esta especie sometida a un cambio de ambiente. Se utilizaron 14 alpacas adultas, elegidas al azar a partir de diferentes rebaños del altiplano chileno (4500 metros sobre el nivel del...
A study was made of basal secretion and the effect of the infusion of pilocarpine on the flow and composition of saliva in the parotid and mandibular glands of the anaesthetized lactating goat. In the parotid gland there was a basal flow (1.6 +/- 0.29 microliter/min) which was not present in the mandibular gland. There is a statistically significan...
A double re-entrant bile cannula is described for use in conscious goats which permits study of bile flow and composition.
El objetivo de este estudio fue estudiar algunas variables fisiológicas de alpacas, que han sido mantenidas por un prolongado periodo de tiempo en el valle semiárido de la zona central de Chile, ambiente en extremo diferente al hábitat altiplánico. Se utilizó un rebaño de 31 alpacas adultas, 21 hembras y 10 machos, con edades comprendidas entre los...
