Nutritional and productive performance of grazing system beef heifers receiving multiple supplementation in the dry season
DOI:
https://doi.org/10.5433/1679-0359.2022v43n4p1541Keywords:
Digestibility, Microbial protein, Nellore, Ruminant nutrition, Supplement, Pasture.Abstract
This research was conducted to evaluate the effects of supplementation multiple on intake, digestibility, and microbial protein synthesis and, productive performance of grazing system receiving multiple supplementation in the dry season. Twelve Nellore heifers (averaging 214.6 ± 7.3 kg initial BW and 8.0 ± 0.10 months) were distributed to a completely randomized design in two treatments: unsupplemented (only mineral) and; supplemented (1 kg per animal day-1 of multiple supplement). Only the crude protein (CP) intake was increased by supplementation (P < 0.05). In addition, the supplementation increased the digestibility of organic matter (OM), CP, ether extract (EE), non-fibrous carbohydrates (NFC) and dietary content of digested OM (DOM) (P < 0.05). The supplementation decreased microbial nitrogen to ingested nitrogen ratio (MICNR) (P < 0.05) and increased the serum urea nitrogen (SUN) concentration and urinary nitrogen excretion (UNE) (P < 0.05) in the animals. Finally, average daily gain (ADG) and final BW (FBW) were not affected by supplementation (P > 0.05). In summary, the provision 1 kg per animal day-1 of multiple supplement for beef heifers in grazing system does not improve productive performance in dry season when there is adequate qualitative and quantitative availability of forage mass. However, provision of supplement increases the total nutrients digestibility and nitrogen statuses in the animals.Downloads
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