Abstract
The expansion of agricultural frontiers in Brazil has resulted in the growth of ruminant production in the Pre-Amazon Region. However, this production is favored mainly in the rainy season, due to the greater supply of pasture for the animals. This fact limits the maintenance of production due to the lack of quality forage for the animals throughout the year. This work aimed to evaluate the nutritional value of the different sugarcane varieties for animal feeding during four crop cycles. In this experiment, the varieties RB 92579, RB 867515 and RB 863129 were studied for cane plant, first, second and third ratoons. The experiment was divided in four stages according to each cycle, and each cycle lasted approximately 10 to 11 months. For the productivity analysis and other parameters samples were collected at the end of each experimental cycle, when the dry matter (DM), crude protein (CP), neutral detergent fiber (NDF), acid detergent fiber (ADF), Brix, NDF/Brix and produtctivity were determined. The RB 92579 variety showed higher productivity (P < 0.05) in all the studied cycles, and remained above the national productivity average in all the cycles (±75 ton ha-1). This same variety, presented the best results for all nutricional parameters (DM, CP, NDF, ADF and FDN/Brix) when compared to the other varieties. The productivity/nutritional relation value must be taken into account when choosing a variety for animal feeding, being the RB 92579 variety the most expressive, during four cycles, wich lasted 4 years.
Highlights
The expansion of agricultural frontiers in Brazil has resulted in the growth of ruminant production in the Pre-Amazon Region
This work aimed to evaluate the nutritional value of the different sugarcane varieties for animal feeding during four crop cycles
For the productivity analysis and other parameters samples were collected at the end of each experimental cycle, when the dry matter (DM), crude protein (CP), neutral detergent fiber (NDF), acid detergent fiber (ADF), Brix, NDF/Brix and produtctivity were determined
Summary
With the expansion of agricultural frontiers in Brazil, the Pre-Amazon Region is in full growth with regard to the production of ruminants, mainly goats, sheep, and dairy cattle This growth is considered seasonal, once the production is only accentuated in the rainy season when there is a greater supply of pasture for the animals. Used in the rest of the country as an excellent forage resource in the dry season due to its innumerable attributes, such as the easy implantation, the need for few crop treatments, as well as its high productivity (ranging from 100 to 120 ha-1 or even more), sugarcane has increased its expressiveness in the agricultural scenario in Brazil’s Pre-Amazonian Region, currently with 840 ha-1 planted, and average productivity of 51.64 ton ha-1 in this region (Vidal, 2018) Their harvest season coincides with the period of pasture shortage. The nutritional value of sugarcane should not be considered as an isolated factor, but as a complex formed by chemical composition, and secondary constituents that, together, may interfere with the ingestion and jas.ccsenet.org
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