Resumo

TONETTO, Cléber José et al. Production and chemical composition of diploid and tetraproid genotypes of Ryegrass. Zootecnia Trop. [online]. 2011, vol.29, n.2, pp.169-178. ISSN 0798-7269.

The objective of the work was to evaluate the chemical composition and production of dry matter and seed in five genotypes of ryegrass subjected to different number of cuts, with emphasis on growing dual purpose. The experimental delineation was adopted in blocks at random, with four repetitions and the treatments were distributed in factorial scheme 5 x 5 (genotypes x number of cuts). Was used five genotypes: “Comum”, “São Gabriel”, “Estanzuela 284”, “Avance” and “INIA Titán” and five cut number (one, two, up to five cuts). A significant interaction (P< 0.05) genotype x number of cut for all the variables studied was observed. The increase in the number of cuts ordered greater accumulation of total dry matter (leaves and stems), but lower seed production for all genotypes studied. The response of the chemical composition of dry matter varied depending on the genotype and the number of cuts. The increase in the number of cuts promoted lower crude protein content of leaf and stem for all genotypes studied. The genotypes showed quadratic answer to the contents of neutral detergent fiber of leaves, and the lowest level was observed when there were up to three cuts. Aiming the dualpurpose, you must choose from two to three cuts, given a good production of dry matter to animals but also promoting a seed production satisfactory

Palavras-chave : Lolium multiflorum Lam; poácea; nutritional quality; seed.