At high altitudes, hypoxia, oxidative stress or both compromise sheep fertility. In the present work, we tested relative effect of short- long-term exposure to altitude hypobaric hypoxia and on corpora luteal structure function. The growth dynamics lutea during estrous cycle were studied daily by ultrasonography in cycling that either native naïve high-altitude conditions supplemented not with antioxidant vitamins. Arterial venous blood samples simultaneously drawn for determination gases...

Pregnancies at high-altitudes are influenced by hypoxia and oxidative stress frequently affected IUGR. However, a common thought is that early pregnant women visiting altitude have no major complications for gestation development, since IUGR developed during the second half of pregnancy. Thus, using well-characterized sheep-model, we aimed to determine whether long- and/or short-term exposure high-altitude may affect maternal steroidogenesis therefore embryo-fetal growth from conception. The...

The aim of the present study was to assess reliability fecal indices as predictors nutrient intake in sheep under extensive grazing conditions. Fecal concentrations 2,6-diaminopimelic acid (DAPAf), nitrogen (FN) and phosphorous (FP) were determined four kept an system on annual Mediterranean grassland vegetative, reproductive dry phenological stages. Metabolizable energy (MEI), crude protein (CPI) phosphorus (PI) calculated using botanical composition, metabolizable energy, each vegetal...

Understanding the botanical composition of herbivores' diets and their nutritional quality is an important question in development sustainable strategies for management natural resources. In Chilean highland vicuña-grazed grasslands, there little information this regard and, therefore, study aimed to determine year-round profile diet's quality. on area 21.9 ha, continuously grazed 3.06 VU/ha/year (18°03' S, 69°13' W; 4425 m.o.s.l), twelve feces piles were sampled monthly analyzed through...

A simple method for estimating suitable territory bioenergy species in Chile.Cien.Inv.Agr.42(2

For an adequate management of natural grasslands, the knowledge and understanding dietary habits herbivores their trophic interactions are fundamental. During two summer seasons, in a mountain range sector Coquimbo Region, Chile, botanical composition, diversity, similarity diets horses, European brown hares, guanacos were studied, as was selectivity main grassland plant species, using feces microhistology. The contribution hydromorphic grasses similar (35.90 ± 7.27%) horses (32.25 4.50%),...

A study was conducted to determine the Livestock farm intensity coefficient, by ratio between stocking and carrying capacity of grazinglands Los Ríos, Lagos, General Carlos Ibanez del Campo (Aysén) Magallanes Chilean Antarctica (Chilean Patagonia) regions.The current rate determined through 2007 Census information coverage crosses regarding pastoral rangelands at county level, it compared which capacity.The latter variable calculated from average rangeland DM annual production, estimated...

The aim of the present study was to evaluate effect two types nutritional supplementation during late gestation on chemical composition, energy value, and IgG concentration in colostrum blood serum lambs. Pregnant Merino Precoz ewes (n = 36) carrying single fetuses were used. Animals kept grazing Mediterranean annual grassland. From day ~90 pregnancy, animals allocated into three groups: daily with oat grain or lupine a control group without supplementation. Immediately after parturition,...

Sheep and goat grazing diets on an annual Mediterranean

The genetic coefficients, representative of a crop, are necessary to use growth models; in many cases the range species is known, but there no specific values for varieties.Durum wheat (Triticum turgidum L. ssp.durum) 'Llareta-INIA' and 'Corcolén-INIA' were sown under irrigation experiment station Antumapu Universidad de Chile on 29 June 2007, 19 May 2009, 15 2010 order determinate four coefficients: developmental thermal time, phyllochron (PHLN), extinction coefficient (k), radiation...

The re-introduction of domestic South American camelids (alpacas and llamas) in the central zone Chile makes it necessary to study their behaviour adaptability.Since is fundamental characterize camelid's diet, present work had as an objective determination plant species selected by alpacas (Lama pacos Linn.) different phenological stages (vegetative, reproductive dry season).The was carried out over three years a paddock 2.5 ha sparse shrubland dominated Acacia caven (Mol.)Mol. annual...

For a simple, non-invasive evaluation of nutritional status sheep kept under extensive grazing conditions on annual rangeland, fecal indices (2,6 diaminopimelic acid, nitrogen, and phosphorus) obtained during the vegetative, reproductive, dry grassland phenological stages, were correlated with ruminal physiological biomarkers (volatile fatty acids ammonia). Through correlation analysis linear regressions, degree association between variables studied was established. The that presented...

The success of conservation programs for the taruka (Hippocamelus antisensis d’Orbigny), an endemic and endangered deer, depends on many factors, highlighting anthropogenic ecological effects. Among latter, how this herbivore interacts with forage resources is important. objective study was to describe main attributes diet deer in rangelands adjacent agricultural areas foothills Tarapacá Region, Chile. botanical composition (BCD) determined by microhistology feces fecal nitrogen (NF, %)...

Suffolk Down (S) and Merino Precoz (MP) are the main sheep breeds reared in central south area of Chile.In both source income for farmers is weaned lamb sale, therefore traits associated to reproduction, live weight growth were included selection objectives genetic improvement programs.In dual purpose breeds, fleece weight, length diameter fiber also programs.The objective this study was estimate phenotypic correlations among some economically important meat sheep.The studied S MP birth (BW)...

In the present study, models were developed to determine monthly and annual spatio-temporal variation of temperature, precipitation, solar radiation based on topoclimatic analysis Arica-Parinacota Tarapacá in northern Chile. To construct equations model, data from meteorological stations physiographic factors (latitude, longitude, altitude, distance bodies water) obtained a digital terrain model with resolution 90 m compiled database. The generated by stepwise regression backward selection...

Abstract Sustainability in aquaculture is a necessity of the future, not only as most promising means supplying protein that world will require to feed its growing population but offer needed conservation world’s ocean resources. The use wild fish inputs farm-raised outputs has been primary concern sustainability production. Herbivorous are more efficient converters into flesh. Species genus Medialuna have reported fast-growing, short-lived species. native Acha ( ancietae Chirichigno 1987)...

An analysis of the morphometric variables and zoometric index a herd creole goats in Mediterranean area central Chile was conducted, considering both females males three age categories (unweaned kids, growing adults). These were analysed using variance principal components analysis. In most variables, effect sex their respective interaction significant. The component allowed to reduce number be (from 16 8 variables) establishing two major components, one related size other referring animal...

Body weight in alpacas from birth up to 6 month of age was studied 4 different regions Chile. Animals were located the Andean high plateau (I region) (n=37); Magallanes (XII (n= 12); coastal dryland (VI (n=20, and semiarid interior valley nearby mountains (metropolitan (n=32). Each animal weighed at then once a month. No statistical differences body by sex observed any group. All newborns double their second age, except where it took them 3 months. At six subjects represent 54.64% mature...

The aim of this study was to calculate and compare efficiency four selection indices (I S ) in dual purpose sheep.Selection were calculated using records the Merino Precoz sheep flock Estación Experimental Rinconada de Maipú, University Chile.The traits included breeding objective for each I were: greasy fleece weight (GFW), fibre diameter (FD), birth (BW) weaning growth rate (GR).Genetic parameters obtained from literature phenotypic belong population.Genetic-economic changes (∆H), which...

Estimaciones de temperatura la superficie terrestre, en dias parciales a completamente despejados, fueron realizadas partir los datos proporcionados por el sensor Advanced Very High Resolution Radiometer (AVHRR), bordo serie satelites National Oceanic and Atmospheric Administration (NOAA) aplicacion un algoritmo basado metodo Split-Window. El utilizado supone correcciones emisividad y contenido vapor agua atmosferico, fue validado con mediciones terrestre terreno. Para esto, data logger...

Sheep production on the Mediterranean dry climate lands of Chile is characterized by its seasonality and extensive system, with low use purchased external productive inputs. The prevailing market conditions have determined an increasing tendency towards specialized meat breeds. systems are strongly influenced agroclimatic characteristics continuous need management profitability improvement. A simulation model was developed to assist decision-making be used as a tool for supporting that...