Abstract
This experiment was carried out to study the effect of acetic acid addition to rice straws that had been already treated with urea on chemical composition, digestibility, nutritive value, and productive performance of ewes. Thirty ewes with an initial body weight of 44 ± 0.41 kg were chosen 7 days after parturition and divided into 3 groups (10 of each) for 3 months. Each group was assigned randomly to receive one of the three experimental rations composed of concentrate feed mixture and untreated rice straw as a control group (G1), urea-treated rice straw (G2), and urea-acetic acid-treated rice straw (G3). Digestibility coefficients and nutritive value were determined using fifteen mature rams and blood samples were obtained at the end of the collecting period. Findings indicated that the crude protein of rice straw was increased, and crude fiber content was decreased by either urea or urea-acetic acid rations (i.e., G2 and G3). Digestibility of most nutrients was increased (P < 0.05) for animals fed either G2 or G3 rations. There were no significant differences in nutritive value as total digestible nutrients (TDN) among tested groups; however, digestible crude protein (DCP) increased (P < 0.05) for G2 and G3 rations. Plasma total protein, AST, creatinine, and urea were increased (P < 0.05) by feeding on G2 or G3 ration; however, plasma ALT was not affected. The average daily intake of dry matter (DM), TDN, and DCP was higher for G2 and G3 rations. Actual milk yield, fat-corrected milk (FCM), percentages of fat, and total solids and constituents yield were increased (P < 0.05) by feeding on treated rice straw rations (i.e., G2 and G3); however, the percentages of protein, lactose, solids not fat, and ash were not affected. In the 1st month after parturition, the changes in ewes body weight were less (P < 0.05) when they fed on G2 and G3 rations than the control one (G1)). Dams’ production and offspring performance were improved (P < 0.05) by feeding on G2 and G3 rations. Feed conversion as kg DMI/kg FCM, kg TDN/kg FCM, and economic efficiency was improved for G2 and G3. In concluded, adding acetic acid to urea-treated rice straw may improve the performance of ewes fed on it and increase their milk production and profitability. The same trend was observed with (G2) which received urea-treated rice straw ration.
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The research team’s advice from Professor Kamel Etman Ibrahim, Professor of Animal Nutrition at the Animal Production Research Institute, is gratefully acknowledged by the authors.
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PYL, MHA, MME, HAE, and AMH organized the experiment, carried out the research, and finished the laboratory analysis. HAMH and AZMS finished the data analysis, writing, and paper revision. All writers examined the final manuscript and approved it.
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Phillip, Y.L., Hassanien, H.A.M., Abou El-Fadel, M.H. et al. Effect of acetic acid addition to rice straw pre-treated with urea on performance of dairy ewes. Trop Anim Health Prod 55, 351 (2023). https://doi.org/10.1007/s11250-023-03716-y
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DOI: https://doi.org/10.1007/s11250-023-03716-y