<b>Nutritional value of dual-purpose wheat genotypes pastures under grazing by dairy cows

Abstract

In the south of Brazil, one of the major limitations to milk production is the low forage availability during autumn and early winter. The use of dual-purpose wheat genotypes is one alternative to minimize the impact of low forage availability in addition to produce grains. Therefore, this study aimed to evaluate the nutritional value of two dual-purpose wheat genotypes (BRS Tarumã and BRS Umbu). Structural composition and forage nitrogen uptake were evaluated. The nutritional value of the forage was analyzed for mineral matter (MM), organic matter (OM), neutral detergent fiber (NDF), crude protein (CP), total digestible nutrients (TDN), in situ organic matter digestibility (ISOMD) and in situ dry matter digestibility (ISDMD). Differences in NDF (49.03 vs. 46.44%), CP (24.4 vs. 27.4%), ISOMD (83.53 vs. 85.45%), ISDMD (83.59 vs. 86.65%) and TDN (75.37 vs. 78.39) for BRS Umbu and BRS Tarumã genotypes were detected, respectively. The BRS Umbu genotype had a lower leaf blade proportion and forage nitrogen uptake. The dual-purpose wheat genotype BRS Tarumã was superior in nutritive value.

Agronomic performance of wheat BRS Tarumã under different sowing densities, nitrogen fertilization and cutting managements

“…Meinerz et al (2011), evaluating wheat genotypes submitted to 3 cuts, observed average values between 24.2% (1 st cut), 22.8% (2 nd cut) and 15.6% (3 rd cut) crude protein. Quatrin et al (2017) observed values of 26.7, 27.8 and 27.6% crude protein for the 1 st , 2 nd and 3 rd cuts, respectively.…”

“…According to the results of Meinerz et al (2012), wheat BRS Tarumã showed higher forage production in the second cut compared to the first one. Quatrin et al (2017), evaluating the nutritional value of dual-purpose wheat BRS Tarumã in 3 grazing cycles, observed higher forage yield in the last grazing cycle (2,070 kg ha -1 ).…”

<b>Nitrogen sources associated with different physical forms of corn grain in the diet for steers in feedlot

“…In these samples, it were determined the dry matter, crude protein and ether extract contents, according to Association of Official Agricultural Chemists (AOAC, 1995). The neutral and acid detergent fiber contents were determined by the method of Van Soest, Robertson, and Lewis (1991) and the estimation of the total digestible nutrients was obtained according to Quatrin et al (2017).…”

Nutrient production in pastures of Triticale BRS Saturno submitted to different levels of nitrogen in topdressing

“…Dual-purpose winter cereals (Avena sativa L.; Avena strigosa Schreb; Hordeum vulgare L.; Secale cereale; Triticum aestivum; X Triticosecale Witt.) that allow the production of both pasture and grains during the same harvest cycle, have been used in several countries, including Australia (Sprague, Kirkegaard, Graham, Dove, & Kelman, 2014;Sprague et al, 2018), Brazil (Meinerz et 2012; Quatrin et al, 2017;Carvalho et al, 2018), China (Tian, Bell, Shen, & Wish, 2012;Hu et al, 2019), and Italy (Giunta, Motzo, Virdis, & Cabigliera, 2017;Giunta, Cadeddu, Mureddu, Virdis, & Motzo, 2020), among many others. They are seen as a way to intensify production on rural properties and increase profitability (Ates et al, 2018) by increasing integrated agricultural production systems in the short term (Henz et al, 2016).…”