Efecto de la hora de colecta e índice temperatura-humedad sobre las características seminales porcinas
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Rev. Inv. Cs. Agro. y Vet.
Abstract
La calidad seminal en porcinos es un campo de investigación en la producción porcina, ya que tiene un impacto directo en la eficiencia reproductiva y, por consiguiente, en la rentabilidad de las granjas. El objetivo del estudio fue evaluar el efecto del índice de temperatura y humedad (ITH) sobre las características seminales porcinas colectadas en diferentes horarios. El enfoque es cuantitativo, descriptivo, diseño experimental, Se realizó en la Unidad de Docencia, Investigación y Vinculación Hato Porcino de la ESPAM-MFL. Materiales y métodos: Se usaron tres verracos mestizos y se extrajo un eyaculado de cada animal semanalmente durante 14 semanas. La unidad experimental fue el eyaculado extraído individualmente. Se evaluó volumen de eyaculado, concentración espermática, motilidad masal, motilidad individual y rectilínea, vitalidad, pH y morfología espermática. Se aplicó un modelo lineal general mixto considerando la hora de colecta e ITH como efectos fijos y los verracos como efecto aleatorio. Las horas de colecta fueron a las 8:00 h, 12:00 h y 16:00 h. Los resultados registraron una temperatura ambiental promedio de 29,24 ± 3,13 °C, acompañada de una humedad relativa promedio de 81,14 % ± 13,02. El ITH presentó un valor promedio de 80,69 ± 3,25., lo que indica presencia de estrés calórico durante el experimento. Sin embargo, las variables macroscópicas y microscópicas del eyaculado porcino no mostraron diferencias significativas (p>0,05), a pesar de ello, se observó que el volumen del semen variaba en función del horario de colecta. Se concluye que el ITH dentro del rango evaluado en este estudio, no afecta la calidad espermática.
Semen quality in pigs is a field of research in pig production, as it has a direct impact on reproductive efficiency and, consequently, on farm profitability. The objective of the study was to evaluate the effect of the temperature and humidity index (THI) on the characteristics of pig semen collected at different times. The approach is quantitative, descriptive, experimental design. It was carried out at the Teaching, Research and Pig Herd Linkage Unit of ESPAM-MFL. Materials and methods: Three crossbred boars were used and an ejaculate was extracted from each animal weekly for 14 weeks. The experimental unit was the ejaculate extracted individually. Ejaculate volume, sperm concentration, mass motility, individual and rectilinear motility, vitality, pH and sperm morphology were evaluated. A mixed general linear model was applied considering the collection time and THI as fixed effects and the boars as a random effect. The collection times were 8:00 h, 12:00 h and 16:00 h. The results recorded an average environmental temperature of 29.24 ± 3.13 °C, accompanied by an average relative humidity of 81.14 % ± 13.02. The THI presented an average value of 80.69 ± 3.25, which indicates the presence of heat stress during the experiment. However, the macroscopic and microscopic variables of the boar ejaculate did not show significant differences (p>0.05), despite this, it was observed that the semen volume varied depending on the collection time. It is concluded that the THI within the range evaluated in this study does not affect sperm quality.
Semen quality in pigs is a field of research in pig production, as it has a direct impact on reproductive efficiency and, consequently, on farm profitability. The objective of the study was to evaluate the effect of the temperature and humidity index (THI) on the characteristics of pig semen collected at different times. The approach is quantitative, descriptive, experimental design. It was carried out at the Teaching, Research and Pig Herd Linkage Unit of ESPAM-MFL. Materials and methods: Three crossbred boars were used and an ejaculate was extracted from each animal weekly for 14 weeks. The experimental unit was the ejaculate extracted individually. Ejaculate volume, sperm concentration, mass motility, individual and rectilinear motility, vitality, pH and sperm morphology were evaluated. A mixed general linear model was applied considering the collection time and THI as fixed effects and the boars as a random effect. The collection times were 8:00 h, 12:00 h and 16:00 h. The results recorded an average environmental temperature of 29.24 ± 3.13 °C, accompanied by an average relative humidity of 81.14 % ± 13.02. The THI presented an average value of 80.69 ± 3.25, which indicates the presence of heat stress during the experiment. However, the macroscopic and microscopic variables of the boar ejaculate did not show significant differences (p>0.05), despite this, it was observed that the semen volume varied depending on the collection time. It is concluded that the THI within the range evaluated in this study does not affect sperm quality.
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Vol. 9, No. 25