296 Black oat production in different oversowing modalities in an integrated crop–livestock system
Year: 2017
Type: conference-abstract
Abstract: The aim of this study was to evaluate the effects of corn (Zea mays L.) silage intercropped with palisade grass [Urochloa brizantha (Hochst. ex A. Rich.) R. Webster cv. Marandu] and pigeonpea [Cajanus cajan (L.) Millsp.] in summer/fall and oversowing modalities of black oat (Avena strigosa Schreb.) in winter/spring on forage mass of pasture. The experiment was conducted in a completely randomized design, with a 2 × 2 × 2 factorial treatment arrangement (n = 48/yr), combining 2 silage production systems (SPS; corn + palisade grass + pigeonpea [C+PG+PP] and corn + palisade grass [C+PG]), 2 black oat oversowing modalities (BO; in line [LI] and broadcasted [BR]), and 2 grazing cycles (GC). Grazing management used 12 crossbred male lambs (27.2 ± 0.6 and 24.0 ± 0.7 kg BW in the first and second growing season, respectively) by treatment. Animals spent the day grazing the black oat (fixed stocking rate and rotational grazing) and at night, they were herded into a barn. Prior to starting grazing, 16 height measurements, using a sward stick, were determined and forage mass of pasture (FM) was determined by cutting 2 representative samples (0.25 m2 areas per plot at ground level). Forage samples were dried, weighed, and reported as kilograms of DM per hectare. Data were analyzed using PROC MIXED with SPS, BO, GC, and their interactions considered fixed effects and paddocks (SPS × BO × GC) as random effects. In the first growing season, FM was greater for C+PG+PP (P = 0.04; 814 vs. 665 kg of DM/ha), greater for black oat oversowing LI (P = 0.05; 813 vs. 667 kg of DM/ha), and greater in the first GC (P < 0.001; 884 vs. 635 kg of DM/ha). In the second growing season, there were interactions between SPS and BO. Greater FM was observed for C+PG+PP associated with LI oversowing of oat than BR (P = 0.04; 2,409 vs. 1,947 kg of DM/ha) in this season. However, for C+PG, the FM was not altered, regardless of oat oversowing, BR or LI (P = 0.04; 1,803 vs. 1,706 kg of DM/ha). For oversowing BR, the FM was not altered, regardless of silage production systems, C+PG+PP or C+PG (P = 0.04; 1,947 vs. 1,804 kg of DM/ha). For LI oversowing, the FM was greater for C+PG+PP (P = 0.04; 2,409 vs. 1,707 kg of DM/ha). In conclusion, corn intercropped with palisade grass and pigeonpea for silage in summer/fall increases the forage mass of pasture. In the winter/spring, in line oversowing of black oat presents greater forage mass than the broadcasted modality.
Source: Journal of Animal Science
Language: English
Subfield: Agronomy and Crop Science
Domain: Life Sciences
SDG: Zero hunger
Open Access status: green
OpenAlex ID: W2744599704