The aim of this study was to compare the expected genetic progress of the selection indexes for Corriedale sheep based on performance and progeny tests. The study was carried out in the “Corpacancha” Production Unit of the SAIS Pachacútec, Junín, Peru, at an altitude of 4150 meters above sea level. A performance test was used based on bodyweight and fleece weight, and the mixed model to obtain the best unbiased linear predictor (BLUP), where the fixed effects were sex, type of parturition and a covariate age at weaning. The progeny was 118 females and 73 males. The bodyweight at first shearing was 65.86 ± 13.25 kg and the clean fleece weight of 5.99 ± 1.44 kg. The fertility rate was 75%, birth rate 109.7%, twin births 4.8% and 1.7 services/pregnancy. The bodyweight correlation with fleece weight was 0.47, suitable for the selection indices. The expected genetic progress of the pe...

The aim of this study was to compare the effect of N, P and K fertilization on the production of aerial biomass of two native grasses Festuca dolichophylla and Festuca humilior. The experiment was carried out in the SAIS Túpac Amaru, Junín, Peru, at an altitude of 4186 m. The treatments were N, P, K, NPK and a control. The nitrogen, phosphorus and potassium doses were 36.24, 4.27 and 29.92 kg/ha, respectively. The model of blocks with orthogonal contrasts was used. The variables were: fresh aerial biomass (kg/ha), dry aerial biomass (kg/ha) and percentage of dry matter. Fresh aerial biomass was 783.9±110.7 and 662.9±24.9 kg/ha, dry aerial biomass was 477.6±62.9 and 410.2±15.4 kg/ha, and percentage of dry matter was 64.11±1.82 and 61.47±0.56% in F. dolichophylla and F. humilior, respectively, with F. dolichophylla being the species with the highest production of aerial biomass (p&...

The aim of this study was to compare the growth, biomass accumulation, tillering dynamics and water behavior of Festuca dolichophylla (Presl, 1830) (fedo) and Festuca humilior (Nees y Meyen, 1841) (fehu). The study was carried out in grasslands of good condition in the Peruvian highlands at an altitude of 4186 m. The model included species and month as fixed effects, and age post-plating as a random effect. fedo evidenced a greater height to the flag leaf with 29.66±0.56 cm and volume of grass with 993.88±44.34 cm3, while fehu evidenced a greater proportion of flowering with 35.71±1.84%. Both species had a similar quantity of basal tillers. In March-2016 the highest peak of volumetric soil moisture (20 cm) with 57.37±0.78% was evidenced, while in September 2016 it was the lowest peak with 13.86±0.83%. In December 2016, the highest transpiration peaks were evident with 92-95 mmol m2-...

The models of growth and allometry of grasslands allow to know growth and development phenomena. Consequently, the aim of this study was to develop a multi-species allometric model to estimate biomass in three grasses in the High Andean Zone of Jauja, Peru, at an altitude of 3600 m above sea level. The native grasses were Festuca dolichophylla (J. Presl) tall (50-90 cm), Festuca humilior (Nees & Meyen) medium (20-35 cm) and Calamagrostis vicugnarum (Weddell) Pilger short (5- 25 cm). The measured variables were biomass (g, YB), basal diameter (cm, XD), canopy diameter (cm, XC) and height (cm, XH). The potential regression was used by choosing the strength of the models by the Akaike criterion (IAC) and the adjusted coefficient of determination (adjusted R2). The multispecies allometric model was Y = 1,238 * XD2,231, due to its lower IAC (383.795) and higher adjusted R2 (85.4%). C. vic...

The aim of this study was to compare the expected genetic progress of the selection indexes for Corriedale sheep based on performance and progeny tests. The study was carried out in the “Corpacancha” Production Unit of the SAIS Pachacútec, Junín, Peru, at an altitude of 4150 meters above sea level. A performance test was used based on bodyweight and fleece weight, and the mixed model to obtain the best unbiased linear predictor (BLUP), where the fixed effects were sex, type of parturition and a covariate age at weaning. The progeny was 118 females and 73 males. The bodyweight at first shearing was 65.86 ± 13.25 kg and the clean fleece weight of 5.99 ± 1.44 kg. The fertility rate was 75%, birth rate 109.7%, twin births 4.8% and 1.7 services/pregnancy. The bodyweight correlation with fleece weight was 0.47, suitable for the selection indices. The expected genetic progress of the pe...

The aim of this study was to compare the effect of N, P and K fertilization on the production of aerial biomass of two native grasses Festuca dolichophylla and Festuca humilior. The experiment was carried out in the SAIS Túpac Amaru, Junín, Peru, at an altitude of 4186 m. The treatments were N, P, K, NPK and a control. The nitrogen, phosphorus and potassium doses were 36.24, 4.27 and 29.92 kg/ha, respectively. The model of blocks with orthogonal contrasts was used. The variables were: fresh aerial biomass (kg/ha), dry aerial biomass (kg/ha) and percentage of dry matter. Fresh aerial biomass was 783.9±110.7 and 662.9±24.9 kg/ha, dry aerial biomass was 477.6±62.9 and 410.2±15.4 kg/ha, and percentage of dry matter was 64.11±1.82 and 61.47±0.56% in F. dolichophylla and F. humilior, respectively, with F. dolichophylla being the species with the highest production of aerial biomass (p&...

The aim of this study was to compare the growth, biomass accumulation, tillering dynamics and water behavior of Festuca dolichophylla (Presl, 1830) (fedo) and Festuca humilior (Nees y Meyen, 1841) (fehu). The study was carried out in grasslands of good condition in the Peruvian highlands at an altitude of 4186 m. The model included species and month as fixed effects, and age post-plating as a random effect. fedo evidenced a greater height to the flag leaf with 29.66±0.56 cm and volume of grass with 993.88±44.34 cm3, while fehu evidenced a greater proportion of flowering with 35.71±1.84%. Both species had a similar quantity of basal tillers. In March-2016 the highest peak of volumetric soil moisture (20 cm) with 57.37±0.78% was evidenced, while in September 2016 it was the lowest peak with 13.86±0.83%. In December 2016, the highest transpiration peaks were evident with 92-95 mmol m2-...

The models of growth and allometry of grasslands allow to know growth and development phenomena. Consequently, the aim of this study was to develop a multi-species allometric model to estimate biomass in three grasses in the High Andean Zone of Jauja, Peru, at an altitude of 3600 m above sea level. The native grasses were Festuca dolichophylla (J. Presl) tall (50-90 cm), Festuca humilior (Nees & Meyen) medium (20-35 cm) and Calamagrostis vicugnarum (Weddell) Pilger short (5- 25 cm). The measured variables were biomass (g, YB), basal diameter (cm, XD), canopy diameter (cm, XC) and height (cm, XH). The potential regression was used by choosing the strength of the models by the Akaike criterion (IAC) and the adjusted coefficient of determination (adjusted R2). The multispecies allometric model was Y = 1,238 * XD2,231, due to its lower IAC (383.795) and higher adjusted R2 (85.4%). C. vic...

Background: Creole goat husbandry for milk and meat improves food security in rural areas in Perú. Body weight (BW) is a key trait for selecting breeding stock, and it is estimated to be using algorithms. Likewise, BW is common in livestock farming. Aim: This study aimed to compare BW prediction models using a data mining algorithm in Creole goats, considering their biometric measurements. Methods: Data from 1,075 females aged between 1 and 4 years were used. Measurements of chest width, thoracic perimeter, wither height, sacrum height, rump width and length, body length, cannon bone perimeter, age, and region of the herd were recorded. The regression trees (classification and regression tree), support vector regression (SVR), and random forest regression (RFR) algorithms were used. Results: The SVR was better at predicting BWs in Creole goat herds. Similarly, the results were stable du...

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

Universidad Nacional Agraria La Molina. Escuela de Posgrado. Maestría en Producción Animal

Universidad Nacional Agraria La Molina. Escuela de Posgrado. Maestría en Producción Animal

Universidad Nacional Agraria La Molina. Escuela de Posgrado. Maestría en Producción Animal

Goat farming in Peru is a husbandry activity that, although it is considered secondary in the country, has a great economic and social impact on the rural population, that is why government efforts to develop is so important. The objective of this study was to characterize dairy goat rearing systems in the coastal valleys of the Lima region to identify gaps and opportunities for improvement. This cross-sectional research was conducted in four provinces located in the Lima region, Peru. A total of 62 goat farmers participated in the trial. For data collection, a standard survey was prepared with open and closed questions distributed across two components (socioeconomic and productive). The surveys were processed for qualitative variables using a multiple correspondence analysis (MCA) followed by a hierarchical cluster analysis (HCA) to differentiate the types of farming systems prevalent ...

Background and Aim: Characterizing local animal production systems is crucial for sustainable livestock development. This study aimed to characterize the diversity of goat production systems in the Highlands of Chincha province, Ica, Peru. Materials and Methods: A structured questionnaire was used to gather data from 82 goat breeders in three districts: San Juan de Yanac, San Pedro de Huacarpana, and Chavín. Factor analysis of mixed data and hierarchical classification analysis were conducted to identify typologies of goat production systems using R version 4.4.2. Results: Four distinct goat production types were identified, primarily differentiated by feeding location and deworming frequency. Type 2 (41.5%) was the most prevalent, characterized by grazing on breeders own land, minimal milk production (<1 liter/day, 91.2%), and a focus on cheese and goat kid sales (70.6%). Breeders were...

Creole goats have adapted to the harsh Andean environment, yet the physiological impacts of high-altitude production systems remain underexplored. This study assessed seasonal and dietary influences on the hematological and biochemical profiles of 45 Creole goats in the Peruvian Andes. The animals were assigned to three diets: D1 (grazing), D2 (grazing + 2000 g hay), and D3 (grazing + 400 g concentrate), across rainy and dry seasons. Biweekly blood sampling measured urea, cholesterol, total protein, albumin, ALP, ALT, WBCL, NeuP, LymP, HGB, and MCV. Season exerted the strongest influence (p < 0.001), with modest dietary effects and a consistent effect of sampling time. Urea, total protein, and albumin increased during the rainy season, though only urea responded significantly to diet. Leukocytosis rose in the dry season and with higher-protein diets, suggesting heightened immune activati...

Goats are an important component of smallholder family farms along the coast and highlands of Peru. The weight of an animal is an important indicator of the production and economy of farmers in rural areas. Therefore, this study aimed to develop predictive models for Body Weight (BW) using Morphometric Measurements (MM) of Creole goats (Capra hircus) in Perú. BW and five MM were collected from 356 goats from the coast and highlands of Peru. Variables were analyzed using correlation and stepwise regression analysis to select the best model based on the coefficient of determination (r²), adjusted r², Residual Standard Error (RSE), and Akaike Information Criterion (AIC) using the RStudio statistical software. The highest correlation was found between BW and TG (0.76), followed by RW (0.67), and RH (0.65). The combinations of MM selected as predictors of BW by stepwise regression were TG,...