Diagnóstico comparativo do desempenho produtivo de bovinos de corte em sistema de terminação intensiva a pasto

Abstract

The supplementation of animals managed in an extensive system becomes an essential practice when one wants a high performance of the animals, with regard to weight gain and carcass yield, even in animals managed in an intensive system on pasture, known as intensive finishing to pasture. Thus, the present research aimed to present a comparative diagnosis of the productive performance of three distinct genetic groups of beef cattle managed in Intensive Finishing on Pasture. A total of 195 male beef steers were used, distributed in 3 (three) different genetic groups (Nelore, Angus and crossbred animals), in a commercial farm located in the municipality of Nova Mutum, State of Mato Grosso, from 10/16/2020 to 04/27/2021. Animals were subjected to the same management and slaughtered without castration, being kept in intensive finishing on pasture (IFP) until they reached the desired weight at slaughter. The performance variables used in the comparative diagnosis were: Average Daily Gain (ADG), Carcass Weight (CW) and Carcass Yield (CY). In addition to these variables, the variables initial weight, final weight and acquired weight were also analyzed using descriptive statistics. The GMD, PC and RC variables were grouped for comparison using the Mann-Whitney test, at 5% probability. It was observed when comparing the genetic groups two by two, that is, Nellore x Angus, Nellore x Cruzados and Angus x Cruzados, that the animals of the Nellore breed presented better performance (p<0.05) in relation to the Angus animals for all the evaluated variables (GMD, PC and RC) and in relation to the Crossed animals, only the carcass yield (RC) was similar between the genetic groups. When the Angus x Cruzados animals were evaluated, a higher PC (p<0.05) was observed in Angus animals, with no significant difference (p>0.05) for GMD and RC of these two groups. It can be concluded that Nellore animals showed superiority in relation to Angus and Cruzados animals, regarding weight gain, carcass weight and carcass yield, when managed in intensive finishing on pasture.