In vitro evaluation of sunflower ( Helianthus annuus L.) silage alone or combined with maize silage

Abstract

Sunflower silage (SS) is being promoted as an efficient forage for feeding dairy cattle in the face of shortages of irrigation and erratic rainfall. The objective was to compare, through the in vitro gas production technique, the kinetics of ruminal fermentation of SS and its mixtures with maize silage (MzS) to know its nutritional characteristics before its inclusion in feeding strategies. Five combinations of SS with MzS were assessed (MzS%: SS%); T1) 100:0, T2) 75:25, T3) 50:50, T4) 25:75 y T5) 0:100. Combining MzS with 25% SS decreased neutral detergent fiber and acid detergent fiber contents (P<0.05), which resulted in a digestibility of dry mather, organic matter, neutral detergent fiber and metabolizable energy similar to MzS (P>0.05), and with a CP content not statistically higher than MzS. The MzS had the highest total gas production (GP) but at a lower fermentation rate (P<0.05) when compared to T2 that had a better fermentation rate of 0.0530 %/h, with Lag time of 3.4 h. Before ensiling, sunflower supplies 31.8 % more CP, 11.8 % less metabolizable energy and 11.9 % less in vitro digestibility of organic matter than maize plant. Compared to T1, the T2 supplied 1.6 % more crude protein, 2 % less metabolizable energy and 4.4 % less of in vitro digestibility of organic matter. Therefore it is concluded that sunflower silage could be an alternative to substitute up to 25 % of maize silage as the crude protein and metabolizable energy supply are similar to maize silage.

Generation of models from existing models composition: An application to agrarian sciences

“…Colonization times ( λ ) ranged from 4.40 h for G2 to 5.46 h for G3. [24] fitted model LB to ten genotypes of Arachis pintoi and found similar λ values as those obtained in the present study at 4.4 to 5.5 h. Lower values were found by [25] for the Arachis pintoi cultivars assessed, from 2.8 to 4.3 h and [26] variation from 3.4 to 4.0 h to evaluate sunflower and corn silage, individually and with different proportions. Highest values were related by [27] for Brachiaria brizantha ranging from (12.9 to 14.6 h), and by [1] in Mulato II grass under nitrogen adubation with doses and different sources this element (6.73 to 9.51 h).…”

“…[26] found high accumulated gas production for corn and sunflower silages and their combinations (0, 25; 50 and 100%). Forage peanut contain some soluble carbohydrates [28] and according to [29], the volume of gases produced depends on substrate composition, i.e., the higher the starch and fiber contents, the lower and higher their gas productions, respectively.…”

Parámetros Fermentativos Y Valor Nutricional De Ensilados De Avena Con Granos De Girasol Y Maíz

“…The IVDMD increased with SG due to the lower degree of lignification of oat forage. Moreover, micro-silos with CG provided soluble carbohydrates which improved digestibility (Aragadvay-Yungán et al, 2015;Ortiz et al, 2017). Additionally, the treatment with the lowest NDF and lignin content has the lowest IVDMD; on the contrary, the higher the content of NDF and lignin, the higher the IVDMD.…”

New model of evaluation of sunflower and corn silages by the in vitro gas production technique

“…Those authors also reported that the TL model had an adequate curve shape in all phases up to 144 h after incubation, except for a small trend shown at 18 h after incubation in corn silage. Aragadvay-Yungán et al (2015) worked with sunflower silage as single roughage or mixed with corn silage at 25, 50, and 75% and found the highest total gas production for corn silage, however, with a lower fermentation rate compared to the mixture containing 25% sunflower silage. Those authors recommended adding sunflower silage to corn silage at 25% to obtain similar rates as corn silage as single roughage.…”

“…Several studies have been carried out to asses the agronomical characteristics, fermentation patterns, bromatological composition, and nutritional value of sunflower silage (Aragadvay-Yungán et al, 2015;Leite et al, 2006Leite et al, , 2017A. D. S. Martins et al, 2014;Viana et al, 2012;Wanderley et al, 2012).…”