Reducing dietary sodium of dairy cows fed a low-roughages diet affect intake and feed efficiency, but not yield.

Autor:	Ben Meir YA; Department of Ruminant Science, Institute of Animal Science, Agricultural Research Organization (ARO), Rishon Lezion 7528809, Israel., Shaani Y; Department of Animal Production, Extension Service, Ministry of Agriculture, Rishon Lezion 7528809, Israel., Bikel D; Department of Animal Production, Extension Service, Ministry of Agriculture, Rishon Lezion 7528809, Israel., Portnik Y; Department of Ruminant Science, Institute of Animal Science, Agricultural Research Organization (ARO), Rishon Lezion 7528809, Israel., Jacoby S; Department of Ruminant Science, Institute of Animal Science, Agricultural Research Organization (ARO), Rishon Lezion 7528809, Israel., Moallem U; Department of Ruminant Science, Institute of Animal Science, Agricultural Research Organization (ARO), Rishon Lezion 7528809, Israel., Miron J; Department of Ruminant Science, Institute of Animal Science, Agricultural Research Organization (ARO), Rishon Lezion 7528809, Israel., Frank E; Department of Animal Production, Extension Service, Ministry of Agriculture, Rishon Lezion 7528809, Israel.
Jazyk:	angličtina
Zdroj:	Animal nutrition (Zhongguo xu mu shou yi xue hui) [Anim Nutr] 2022 Sep 13; Vol. 12, pp. 1-6. Date of Electronic Publication: 2022 Sep 13 (Print Publication: 2023).
DOI:	10.1016/j.aninu.2022.09.002
Abstrakt:	Wastewater from dairy farms has become a major environmental and economical concern. Sodium residue in treated and untreated wastewater from dairy farms used for irrigation can lead to soil and groundwater salinization, with the risk of soil degradation. We examined the effect of reducing sodium fed to mid to late lactating cows from 0.61% (high sodium [HS]) to 0.45% (low sodium [LS]) of dry matter on dry matter intake (DMI), milk and milk-component yields, eating behavior, apparent total track digestibility, feed efficiency, and sodium excretion into the environment. We randomly assigned 28 multiparous high-yielding ( > 35 kg milk/d) cows to 1 of 2 treatment groups (LS or HS) in a crossover design, with 7 d of adaptation and 28 d of data collection. Reducing sodium in the diet reduced sodium intake from 171 to 123 g/d while lowering sodium excreted in the manure by 22%. Energy corrected milk (ECM) yield (37.4 kg/d) and sodium excretion in the milk (33.7 g/d) were similar for both groups. The DMI of LS cows was lower than that of HS cows (27.3 vs. 28 kg/d) and consequently, feed efficiency of the LS cows was higher (1.40 vs. 1.35 ECM/DMI). Eating rate, meal and visit frequency, and eating time were similar for both treatments; meal and visit duration were longer for the HS cows, and meal and visit sizes tended to be larger. Digestibility of DM and amylase-treated neutral detergent fiber remained similar. Based on the results of this study, and discussed considerations, we recommend lowering the dietary sodium content for mid to late lactating cows in commercial herds to 0.52% of DM, in order to reduce sodium excretion to the environment via urine. Competing Interests: We declare that we have no financial and personal relationships with other people or organizations that can inappropriately influence our work, and there is no professional or other personal interest of any nature or kind in any product, service and/or company that could be construed as influencing the content of this paper. (© 2022 The Authors. Publishing services by Elsevier B.V. on behalf of KeAi Communications Co. Ltd.)
Databáze:	MEDLINE
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