Increasing the level of supplementation improves weight gain and increases ω-6 fatty acid levels in the meat of dairy steers finished on tropical pasture
DOI:
https://doi.org/10.5433/1679-0359.2025v46n6p1975Keywords:
Concentrate supplementation, Dairy calves for beef production, Fatty acids in beef, Girolando steers, Grazing cattle.Abstract
The objective of this study was to evaluate the effect of concentrate supplementation on intake, apparent digestibility, feeding behavior, performance, carcass traits, centesimal composition, and fatty acid profile of meat from Girolando steers finished on tropical pasture during the dry season. Twenty castrated Girolando steers, aged 24 ± 2 months and weighing 371 ± 13.02 kg, were distributed in a completely randomized design. The animals were kept under intermittent grazing on Urochloa brizantha cv. Marandu for 135 days on 7.0 ha, divided into 14 paddocks. The animals received concentrate supplement at 3 g kg-1 or 6 g kg-1 of body weight (BW). Crude protein intake increased by 38% (P<0.05), and non-fiber carbohydrate intake increased by 15% with the increase in supplementation from 3 to 6 g kg-1 BW at finishing. Chewing time and the number of chews per cud were lower (P<0.05) in steers supplemented at 6 g kg-1 BW during finishing. Daily weight gain was 29% higher (P<0.05) in animals supplemented at 6 g kg-1 BW. Increasing the supplementation level did not influence (P>0.05) the weight, yield, or carcass fatness parameters of the steers. The 6 g kg-1 level resulted in meat with lower (P<0.05) levels of C15:0 and C14:1, as well as higher (P<0.05) proportions of n-6 fatty acids and a higher n-6:n-3 ratio. We recommend a concentrate supplementation level of 3 g kg-1 BW for steers finished on tropical pasture.
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