Effects of supplementing cassava root silage to grazing dairy cows on nutrient utilization, milk production and composition in the tropics.

Autor: Galvão LTO; Department of Animal Science, Universidade Federal Rural da Amazônia, Parauapebas, Pará, 68515-000, Brazil., Vargas JAC; Center of Agrarian Sciences, Universidade Federal do Norte do Tocantins, Araguaína, Tocantins, 77804-970, Brazil. jcfcav@gmail.com., Mezzomo R; Department of Animal Science, Universidade Federal Rural da Amazônia, Parauapebas, Pará, 68515-000, Brazil., Oliveira LRS; Department of Animal Science, Universidade Federal Rural da Amazônia, Parauapebas, Pará, 68515-000, Brazil., Dos Santos PM; Department of Animal Science, Universidade Federal Rural da Amazônia, Parauapebas, Pará, 68515-000, Brazil., Maciel RP; Department of Animal Science, Universidade Federal Rural da Amazônia, Parauapebas, Pará, 68515-000, Brazil., Soares EA; Department of Animal Science, Universidade Federal Rural da Amazônia, Parauapebas, Pará, 68515-000, Brazil., Farias MLC; Department of Animal Science, Universidade Federal Rural da Amazônia, Parauapebas, Pará, 68515-000, Brazil., Caldas CS; Department of Animal Science, Universidade Federal Rural da Amazônia, Parauapebas, Pará, 68515-000, Brazil., Faciola AP; Department of Animal Sciences, University of Florida, Gainesville, FL, 32611, USA., Alves KS; Department of Animal Science, Universidade Federal Rural da Amazônia, Parauapebas, Pará, 68515-000, Brazil. kaliandra.alves@ufra.edu.br.
Jazyk: angličtina
Zdroj: Tropical animal health and production [Trop Anim Health Prod] 2024 Apr 12; Vol. 56 (3), pp. 120. Date of Electronic Publication: 2024 Apr 12.
DOI: 10.1007/s11250-024-03962-8
Abstrakt: The current study evaluated the effects of supplementing cassava root silage (CRS) to dairy cows grazing on Megathyrsus maximus cv Mombasa on nutrient intake and digestibility, as well as on milk production and composition. Ten primiparous Girolando cows with average body weight ± (SEM) of 373.45 ± (63.55) kg were used in a replicated 5 × 5 Latin square. Animals were subjected to five treatments: (I) grazing cows without supplementation (WCS); (II) grazing cows provided with 5 kg DM of supplement without CRS (0 g/kg DM of CRS) or including (III) 260, (IV) 520, and (V) 780 g/kg DM of CRS. Statistical analyses were performed using the PROC MIXED of SAS with significance at P < 0.05. Intake of neutral detergent fiber (NDF) and ether extract decreased (P < 0.01), while intake of non-fiber carbohydrates increased (P < 0.01), with increased CRS in the diets. Total DM intake and digestibility of DM, and digestibility of nutritional components were lower (P < 0.03) in WCS animals compared to supplemented animals, except for intake and digestibility of NDF, which was the opposite. Milk yield (MY) and fat corrected milk (FCM), as well as all milk components were unaffected (P > 0.05) by CRS inclusion. In contrast, MY, FCM, protein, lactose, casein, and non-fat milk solids (NFMS) were greater for animals that received supplementation (P < 0.05), compared to animals WCS. Milk fat and total dry extract (TMS) did not differ (P > 0.11) between two groups. In conclusion, CRS may be a potential corn meal replacer in the supplement of dairy cows under tropical conditions.
(© 2024. The Author(s), under exclusive licence to Springer Nature B.V.)
Databáze: MEDLINE
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