EFEITO DO USO DE ÁGUA SALOBRA TRATADA MAGNETICAMENTE SOBRE A TAXA DE PRENHEZ DE VACAS NELORES SUBMETIDAS À IATF

Abstract

This work aims to evaluate the use of brackish water subjected to magnetic treatment on pregnancy rate of Nellore cows subjected to fixed-time artificial insemination. As well as the physicochemical parameters characterization of the untreated water and water subjected to the proposed treatments. Related to this theme, climatic and water challenges, with consequences of water resources availability in the different regions of the country, with emphasis on the areas classified as semi-arid in the Midwest and Northeast of Brazil, reveal the need for technologies about the use and treatment of this resource, coming from different sources, as in the case of "brackish water" use for animal watering, specifically in beef cattle in the predominant extensive system in the country, in different production scales. Through the exploration of this asset by small-scale activity, as in family farming, the adoption of new accessible proposals in the different axes of food, genetics, management and animal health, such as the use of technology for water treatment and quality improvement, should be validated to stimulate the activity. Such implementation should consider cost, ease of implementation and management, as well as the different development conditions, such as, for example, magnetic treatment, a technique used for millennia and which has gained prominence in water treatment in several segments, such as in civil construction, human watering, agriculture (application in lettuce, bean seedlings, etc.), and in the interest of animal breeding, with reports of use in female rabbits, dairy cows, improvement of carcass finish index and blood osmolarity in cattle. The present study carried out an experiment using samples of brackish water from a watering trough intended for animal watering of Nellore cattle, destined for slaughter, from a property in the municipality of Arraias-Tocantins, subjected to treatment with a Sylocimol® magnetizing magnet (T1) and to the treatment with a magnet magnetizer from the disposal of the computer sector (T2), the evaluations were carried out during the breeding season (EM) of the 2023/2024 periods, at different times, being M1: 30 days before the beginning of EM, M2: on the day of the beginning of EM, M3: on the last day of EM and M4: 30 days after the end of EM. Within each moment, different times were also differentiated to characterize the physicochemical parameters of the treated water, being T1= immersion moment, T2= 24 hours after immersion, T3= 7 days after immersion and T4= 30 days after immersion, and within each moment they were listed with the samples of brackish water subjected to magnetic treatment. The pregnancy rate calculated based on the numerical formula (%) was analyzed using a generalized linear model (GLM) with the adoption of logistic regression, showing a significant difference within the animals of each treatment group, considering C: control, T1: commercial magnet and T2: alternative magnet.