Examinando por Materia "Morphometry"

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Dinámica subpoblacional del semen criopreservado de alpaca obtenido de conductos deferentes y post cópula
(UCOPress, Universidad de Córdoba, 2026-01-15) Ccalta Hancco, Ruth; Sevilla, F.; Araya Zúñiga, I.; Mata, X.; Cucho, H.; Valverde, A.
Los camélidos suramericanos poseen una relevancia económica, biológica y cultural para estas regiones. A pesar de ello, la conservación y la utilización de tecnologías de reproducción asistida no se ha promovido lo suficiente. La caracterización y conservación de los eyaculados seminales de estas especies, pueden favorecerse con estos procesos. El objetivo de este estudio fue determinar los patrones la morfométricos del semen criopreservado de alpaca recuperado mediante dos métodos de colecta sobre la dinámica subpoblacional espermática. El estudio se realizó en el distrito de Marangani de la provincia de Canchis, Cusco, Perú por el Laboratorio de Biotecnologías Reproductivas de la Facultad de Agronomía y Zootecnia, Universidad Nacional de San Antonio Abad del Cusco y el Laboratorio de Reproducción Animal (AndroTEC) del Instituto Tecnológico de Costa Rica, Escuela de Agronomía, Costa Rica. Se utilizaron un total de 18 eyaculados de seis alpacas adultas (6-8 años). Se utilizó un sistema computarizado de análisis seminal (módulo CASA-morph) para la determinación de la forma y tamaño de la cabeza del espermatozoide de alpaca. Se utilizaron modelos generales lineales y mixtos para evaluar las variables morfométricas de la cabeza del espermatozoide de alpaca. Hubo un efecto sobre las variables de morfometría de acuerdo con el método de colecta y el proceso de conservación del semen. Se determinaron cuatro subpoblaciones espermáticas en los eyaculados de alpaca. Los procesos de conservación seminal influyen sobre el tamaño y forma de los espermatozoides de alpaca. También, tienen efecto sobre la distribución de los espermatozoides en subpoblaciones dentro de un eyaculado. La valoración de la morfología espermática puede favorecer a seleccionar los animales para los procesos de conservación de estas especies.
Morphometric Characterization and Zoometric Indices of High-Andean Creole Cows from Southern Peru
(MDPI, 2025-08-20) Ccalta Hancco, Ruth; Huayta Arizaca, Rito Felipe; Salcedo Quispe, Elvis Lizandro; Valverde, Anthony; Cucho Dolmos, Hernán Carlos; Canaza-Cayo, Ali William; Acuña Leiva, Alex Yony; Estrada Cañari, Richard
High-Andean Creole cattle represent a genetic resource with significant adaptive value in high-altitude ecosystems. In this study, 151 Creole cows from the provinces of Canas and Quispicanchis (Cusco, Peru) were evaluated to characterize their morphometry, calculate zoometric indices, and establish functional biotypes. Ten morphometric parameters were measured, and eight structural indices were calculated. Four differentiated biotypes were identified through the multivariate analysis and hierarchical clustering of quantitative variables (BI, BII, BIII, and BIV). Morphological differences were statistically significant (p < 0.05) and associated with different productive orientations. Biotype I showed greater thoracic development and a compact structure, which is compatible with intermediate beefaptitude; Biotype II exhibited more elongated proportions and a lower weight, indicating a dairy tendency; Biotype III stood out for its muscle mass, thoracic depth, and pelvic width, evidencing a clear beef orientation; and Biotype IV combined a higher weight, rectangular conformation, and wide pelvis, showing potential for beef production and ease of calving. Functional differentiation was supported by Principal Coordinates Analysis (PCoA) and PERMANOVA tests. Correlations between morphometric variables and zoometric indices revealed anatomical patterns consistent with the productive functions proposed. The results highlight the morpho-functional diversity of Andean Creole cattle and their potential for conservation and improvement programs in extensive highland systems.
Phenotypic characterization of the creole goat in the southern highlands of Peru: A first step toward the sustainable use of a forgotten zoogenetic resource
(Eldaghayes Publisher, 2025-06-30) Sessarego Davila, Emmanuel Alexander; Godoy Padilla, David; Lopez Mendoza, Yolvi; Cruz Luis, Juancarlos Alejandro
Background: Five hundred years ago, goats were introduced to Peru, and since then, they have adapted to different climatic conditions, giving rise to the Creole goat, characterized by showing greater rusticity and better quality in both milk and meat than specialized breeds. Aim: This study aimed to describe the phenotype of the Creole goat in the Highlands of Chincha province, Ica. Methods: A total of 146 females aged >2 years without signs of crossbreeding with specialized breeds from the districts of San Juan de Yanac, San Pedro de Huacarpana, and Chavin were evaluated. Six phaneroptic characteristics, nine morphometric characteristics, and nine zoometric indices were registered. Tables and bar graphs were prepared. The chi-square test was performed to determine the association between districts and phaneroptic variables, ANOVA to identify differences between districts, correlation coefficients to evaluate morphostructural harmonicity, and multiple regression analysis to predict the live weight of animals. Results: Of the goats, 61.6% had a spotted coat, 59.6% had no beard, 75.3% had horns, 57.5% had parallel teats, 90.4% had no wattles, and 80.8% had the correct number of teats, showing an association between district and absence/ presence of beard (p = 0.001). All morphometric parameters and zoometric indices were homogeneous within each district, with differences between districts (p < 0.05). Conclusion: The Creole goat of the high Andean area of Chincha is characterized by presenting a high morphostructural harmony, being medium to large in size, brevilineal, convexilinear and having a productive aptitude with a tendency to double purpose.