Eficiência produtiva e econômica na terminação de borregas de descarte reprodutivo com dietas de alto concentrado

Abstract

ABSTRACT This study aimed to evaluate the performance of reproductive culled lambs kept in confinement, through weight gain, carcass yield, and the state of non-carcass components using two high concentrate diets (90%). One diet was formulated on the property compared to commercially available concentrate. The cost-benefits of each diet were analyzed and compared. We used 24 Corriedale lambs, aged 180 days weighing an average of 28 ± 4 kg. The animals were randomly separated into two groups: the commercial concentrate group (CC) which received 0.4% and 4% of their live weight in Tifton hay and commercial concentrate, respectively, and the property concentrate group (CP) received hay and a high-concentrate diet produced on the property (using whole grain corn as a base), in the same proportions. The study was conducted, for a period of 55 days, along with ten days of adaptation, until they reached 40 ± 2 kg body weight (BW). Animals in the property concentrate group achieved a higher average daily gain (0.232 kg/day), but there was no significant difference in carcass yield between the groups The weights of non-carcass components such as the liver, spleen, and kidneys with fat were higher in the concentrate group. The property concentrate group presented a net income of R$ 0.40, while the animals that received the commercial concentrate presented a negative income of R$ - 0.45, per day. Therefore, the use of a high-grain diet produced on the property under the conditions of this study allowed for better weight gain, and a better cost-benefit ratio.