<b>Hay Tifton 85 grass under nitrogen doses in different days of regrowth

Abstract

The objective of this study was to evaluate the yield, nutritional value and potential ruminal degradation of Tifton 85 hay (Cynodon spp.) harvested at four regrowth ages (28, 35, 42 and 49 days) and fertilized with two nitrogen doses (N; 100 and 300 kg N ha-1). The experimental design was a randomized block design, arranged in a 4 x 2 factorial scheme, with six replications each. Nitrogen fertilization increased (p &lt; 0.05) dry matter yield and digestible dry matter production of hay and also lignin and crude protein contents. Nitrogen fertilization increased (p &lt; 0.01) the dry matter yield and the digestible dry matter production of hay, as well as lignin (p = 0.01) and crude protein (p = 0.01). The neutral detergent fiber corrected for ash and protein (p = 0.01), acid detergent fiber (p = 0.01) and cellulose (p = 0.02) adjusted to the quadratic function regression model of the regrowth ages. For potential rumen degradability hay, it was observed quadratic effect (p = 0.01) with maximum value of 73.1% at 37 days of regrowth. Tifton 85 hay fertilized with 300 kg ha -1 of N and harvested up to 37 days of regrowth results in higher hay dry matter yield, higher crude protein content, and better dry matter rumen degradability.

PRODUCTION AND NUTRITIVE VALUE OF CANARANA ERECTA LISA (Echinocloa piramidalis Lam.) IN RESPONSE TO HARVEST INTERVALS

“…It is important to note that the variation in forage accumulation between the cut intervals was reduced, but even so, it was possible to observe that, in the longer harvest intervals, a stabilization tendency occurred. This is in accordance with Andrade et al (13) , who noted that as a plant ages, the dry matter content tends to increase, with stabilization at the end of the cycle. In this study, the observed production of dry matter per harvest was much higher than that observed by Abreu et al (14) ; they found an average yield of 617 kg ha -1 in four cuts at different times of the year when evaluating the productive potential of canarana erecta lisa under rotational grazing in flooded areas of the Amazon.…”

Prevalência De Mastite Em Um Rebanho Bovino No Noroeste Do Paraná E a Susceptibilidade Das Bactérias Isoladas Aos Antimicrobianos

“…Andrade et al (2018) avaliando o feno de capim Tifton 85 adubado com 300 kg de N ha -1 ano e colhido em diferentes idades, obtiveram maior produção e melhor valor nutricional em fenos produzidos aos 37 dias de rebrota. É possível ainda determinar o momento de corte aliando a altura a outros fatores.…”