Effect of replacing forage sorghum silage with biomass sorghum silage in diets for F1 Holstein × Zebu lactating cows

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The objective of this study was to evaluate the effects of two grazing management strategies on structural, productive and nutritional parameters of Marandu grass (Urochloa brizantha cv. Marandu). A completely randomized block design with two pasture management strategies and eight replications (blocks) was used. The grazing management strategies were: (1) low intensity rotational grazing (LI), with a pre-grazing sward height of 40 cm and a post-grazing sward height of 24 cm, i.e., a defoliation intensity of 50%; (2) High intensity rotational grazing (HI), with a pre-grazing sward height of 40 cm and a post-grazing sward height of 10 cm (±70% defoliation intensity). Pastures were sampled before and after grazing for estimation of forage mass, forage accumulation rate, structural characteristics, nutritional value and dry matter intake.The LI strategy resulted in higher dry matter production than HI before (18.33%) and after grazing (49.06%), increasing pre-grazing forage density by 13.21% (P < 0.05). The production of potentially digestible dry matter was highest (P < 0.05) in LI strategy (21.3% before and 39.6% after grazing, respectively). Higher post-grazing green forage mass (45%) increased the residual crude protein in LI. The LI management strategy increased forage mass production and can be used in Marandu grass pastures.

Section: Resultsmentioning

confidence: 99%

Effect of grazing management strategies on the yield and nutritional value of Marandu grass in the semiarid of Brazil

Araújo

Sales

Monção

et al. 2021

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“…However, depending on the production level, there is a need to adjust the protein and energy levels of the diet. In F1 ½ Holstein x ½ Zebu cows in the middle third of lactation, Ramos et al (2021) found that milk yield was not modified when forage sorghum silage (Volumax) was replaced with biomass sorghum silage (BRS 716) harvested at 160 days after planting, and 70 cm of row planting spacing. The forage: concentrate ratio of the diet was 75:25.…”

Section: 48mentioning

confidence: 99%

“…In many regions of the world, in recent years, Sorghum [Sorghum bicolor (L.) Moench] has become an increasingly important forage crop (Qu, Liu, Dong, Lu, & Shen, 2014;Amelework, Shimelis, Tongoona, Mark Laing, & Mengistu, 2015;Rakshit et al, 2016;Perazzo et al, 2017;Mwamahonje & Maseta, 2018;Worede, Mamo, Assefa, Gebremariam, & Beze, 2020). This trend is a consequence of the high dry matter yield of sorghum and its ability to adjust to different climatic and soil conditions, which include hot weather, such as in the semiarid region (Perazzo et al, 2017;Mwamahonje & Maseta, 2018;Borges et al, 2019;Ramos et al, 2021;Rigueira et al, 2021), or relatively cold climates, like Canada, Korea (McCaughey, Therrien, & Mabon, 1996;Paradhipta et al, 2019).…”

Section: Introductionmentioning

confidence: 99%

“…In Brazil, the area destined for the cultivation of sorghum in 2020 was 745.3 thousand hectares, of which more than 95% was destined for animal feed (Companhia Nacional de Abastecimento [CONAB], 2020). In the production of silages for ruminants, forage sorghum has been widely grown in Brazil (Ramos et al, 2021;Rigueira et al, 2021). However, with the uneven rainfall distribution in the semiarid region and other regions of Brazil and the world (Qu et al, 2014), the demand for biomass sorghum for cultivation has grown due to its high dry mass yield, up to 50 t/ha (Castro et al, 2015;May, Souza, Gravina, & Fernandes, 2016;Almeida et al, 2019) in relation to forage sorghum traditionally grown as Volumax, up to 19 t/ha (Castro et al, 2015).…”

Section: Introductionmentioning

confidence: 99%

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Yield and nutritional value of biomass sorghum (BRS 716) managed in different row spacing and maturity at harvest in the semiarid region of Brazil

Souza¹,

Júnior²,

Monção³

et al. 2021

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The objective was to evaluate the structural, yield and nutritional characteristics of biomass sorghum BRS 716 managed in different row planting spacing and harvest age in a semiarid region of Brazil. Three row spacing (45, 70 and 90 cm; plots) and four maturity at harvest (70, 100, 130 and 160 days; subplots) were evaluated following a randomized block design in a 3 x 4 split plot arrangement, with eight blocks. The useful area was 3 x 15 m. Variation in soil fertility in the area was the blocking factor. There was interaction between row spacing and maturity at harvest (P < 0.05) on plant height (P = 0.01), dry matter yield (DMY; P < 0.01) and proportion of senescent material (P = 0.01). The DMY observed at the age of 160 days and spacing of 90 cm was 41.40% higher than the DMY at the same age and in spacings of 45 and 70 cm (mean of 21.45 t/ha). As the maturity at harvest increased, there was a reduction in the crude protein content (P < 0.01), potential degradability (P < 0.01) and effective degradability (P < 0.01) of dry matter, and the content of non-fiber carbohydrates (P < 0.01), total digestible nutrients (P < 0.01) and the readily soluble fraction (P < 0.01) of the dry matter increased. Considering the yield and nutritional characteristics of biomass sorghum BRS 716 managed in the semiarid region for silage production, the row spacing of 90 cm and the maturity at harvest of 160 days after planting are recommended.

“…The Brazil is the fifth largest producer in the world and the first in Latin America. In Brazil, most of the sorghum grown is for animal feed, especially in regions with low rainfall (Ramos et al, 2021;Queiroz et al, 2021;Souza et al, 2021).…”

Section: Introductionmentioning

confidence: 99%

Effect of replacement of forage sorghum silage with biomass sorghum silage in diets for dairy heifers

Queiroz

Júnior

Monção

et al. 2022

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This trial aimed to analyze the replacement of forage sorghum silage (FS silage) with biomass sorghum silage (BRS 716 silage) in diets for heifers ¾ Holstein x ¼ Zebu on their nutrient intake and digestibility, nitrogen balance, microbial production, feeding behavior, and animal performance. Eight heifers with average age 18±4 months (mo) and average body weight (BW) 271 ± 57 kg were used. The experimental design was double-Latin square, 4×4, being four diets, four experimental periods and four animals. Four experimental diets with 0, 33, 67 and 100% substitution of forage sorghum silage with biomass sorghum silage were used. The roughage:concentrate ratio in the total dry matter (DM) of the diets was 75:25. The fraction “b” of DM was higher in the BRS 716 silage. There was no difference (p> 0.05) for dry matter intake (DMI; p = 0.45) and total digestible nutrients intake (p = 0.76). The dry matter digestibility (DMD), crude protein, ether extract and neutral detergent fiber increased linearly with the inclusion of BRS 716 silage. The feeding times, ruminating and idle have not been changed (p > 0.05). The replacement of FS silage with BRS 716 silage did not modify the average daily weight gain (ADG; p > 0.05; mean 1.30 ± 0.025 kg). Biomass sorghum silage can replace up to 100% forage sorghum silage in the diets of ¾ Holstein x ¼ Zebu heifers.