Please use this identifier to cite or link to this item: http://repositorio.ufla.br/jspui/handle/1/55688
Title: Fibrous coproducts of corn and citrus as forage and concentrate sources for dairy cows
Keywords: Fiber coproducts
Chewing behavior
Effective fiber
Issue Date: 2022
Publisher: American Dairy Science Association (ADSA)
Citation: SILVA, W. R. et al. Fibrous coproducts of corn and citrus as forage and concentrate sources for dairy cows. Journal of Dairy Science, [S.l.], v. 105, Suppl. 1, p. 218, 2022. Abstracts of the 2022 American Dairy Science Association Annual Meeting. Disponível em: https://www.adsa.org/Meetings/2022-Annual-Meeting/Abstracts. Acesso em: 6 dez. 2022.
Abstract: This study evaluated the effect of fibrous coproducts from corn and citrus (Cargill, Brazil) on milking performance, digestibility, chewing behavior, and economics of dairy cows. Holstein cows (n = 20; 143 DIM) were fed in 5, 4 × 4 Latin squares with 21-d periods, a combination of factors in a 2x2 factorial arrangement: 1) Concentrates (C): the partial replacement of wet corn gluten feed (GF) by an iso-N blend of pelleted citrus pulp plus corn distillers dried grains (CD), 2) Forages (F): the partial replacement of whole-plant corn silage (CS) with corn ear fibrous coproduct (CO). The goal was to have diets with 20 and 5% of DM of both GF and CO, and to have a 50% replacement of CS by CO. The statistical model had the effects of cow, period, C, F, and C × F interaction. The CS-CD diet had the highest (P ≤ 0.05) yields of 4% FCM (28.5 kg/d) and ECM (30.0 kg/d) relative to the other diets (27.0 and 28.4 kg/d, respectively). Milk fat content was lower (3.24 vs 3.67 %) and DMI was higher (21.2 vs 20.2 kg/d) on CO than CS (P ≤ 0.03). CO reduced (P ≤ 0.04) the intake of peNDF > 8 (kg/d) and the intake as % BW of peNDF > 8, forage NDF, and total NDF. CO diets had greater meal frequency and lower daily meal time, meal duration, meal size, and rumination and eating behaviors than CS (P ≤ 0.04). The total-tract starch digestibility was lower (P < 0.01) on CO than CS, but the intake of digestible starch was higher (P < 0.01) on CO than CS. The GF reduced (P < 0.01) milk yield (29.6 vs 30.8 kg/d), tended (P = 0.06) to reduce DMI (20.4 vs 21.0 kg/d), and reduced (P < 0.01) the intake of digestible organic matter relative to CD. Concentrate source did not affect (P = 0.52) the intake of peNDF > 8. The GF increased (P ≤ 0.02) meal frequency and rumination (min/d, min/kg DMI, and min/kg peNDF > 8) and reduced (P = 0.04) meal size. The intake of digestible starch tended (P = 0.10) to be increased by GF. Rumen microbial yield was not affected (P ≥ 0.13) by any treatment. Income over feed cost (IOFC) was higher (P < 0.01) on CS than CO and concentrate source had no effect (P ≥ 0.61) on IOFC. All strategies evaluated were nutritionally viable.
URI: http://repositorio.ufla.br/jspui/handle/1/55688
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