Índices de condenações de carcaças suínas conforme as estações do ano e tendência para o ano subsequente na região do Triângulo Mineiro, MG

Abstract

This study aimed to investigate the relationship between the condemnation of swine carcasses and the season (hot and humid x cold and dry) and determine trends for the following year. The information obtained from monthly reports produced by the Federal Inspection Service of the region of Triângulo Mineiro, MG, on carcass disapprovals, from 2010 to 2015, amounting to a total of 7,688,972 animals slaughtered was used. Data were evaluated numerically and percentage from the total number of animals disapproved in the period. In sequence, the seasons were defined in summer (October to March), characterized by high air temperature associated with high rain fall and winter (April to September), with slightly milder average temperatures and low rainfall intensity. The verification of the association between the stations and the affections was made by Student's t-test. The prediction occurred after the appropriate adjustment of the time series models for each condition, allowing the prognosis of the behavior of its incidence. The total number of carcass condemnation was 354,064 (4,605%), and, in this figure, 76,847 (21.704%) was due to the contamination, 62,298 (17.595%) to adherence, 47,304 (13,360%) to contusion, 39,747 (11,226% ) to excessive scald, 38,555 (10,889%) to lymphadenitis, 37,491 (10,589%) to dermatosis and 51,822 (14,637%) to other causes. The seasons didn’t influence the prevalence rates of carcass condemnation reasons, except for jaundice that increased in hot and humid period when compared to cold and dry period (P = 0.009). It was estimated that in all months of 2016, the most prevalent disease among the six mentioned, is contamination. In contrast, alternately during this period, adherence and lymphadenitis took the place of lower priority as causes of carcass condemnations. It was concluded that there is no association between the seasons and the causes of swine carcass condemnation in the region of Triângulo Mineiro, MG, and that in the following year, the main cause of carcass condemnations was contamination, while, depending on the month, lymphadenitis and adherence will be considered smallest.