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首页> 外文期刊>Journal of Animal Science >Effect of dietary cation-anion difference on urinary pH, feedlot performance, nitrogen mass balance, and manure pH in open feedlot pens1
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Effect of dietary cation-anion difference on urinary pH, feedlot performance, nitrogen mass balance, and manure pH in open feedlot pens1

机译：日粮中阳离子-阴离子差异对开放式育肥猪舍尿液pH，育肥性能，氮质量平衡和肥料pH的影响1

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Six experiments were conducted to evaluate dietary cation-anion difference (DCAD) in concentrate diets on urinary pH, feedlot performance, and N mass balance. In Exp. 1, 15 wether lambs (33.5 ± 3.0 kg) in five 3 x 3 Latin squares were fed a basal diet of 82.5% dry-rolled corn (DRC), 7.5% alfalfa hay, 5% molasses, and 5% supplement with different proportions of anionic and cationic salts. The DCAD was -45, -24, -16, -8, 0, +8, +16, +24, +32, and +40 mEq per 100 g of DM with the control basal diet (DCAD = +8) included in each square. Urinary pH increased (cubic, P < 0.01) as DCAD increased and DMI increased linearly (P < 0.01) with increasing DCAD. In Exp. 2 and 3, 8 Holstein steers (312 ± 24 kg) were used in 2 consecutive 4 x 4 Latin squares. Steers were fed either the same basal diet as Exp. 1 or a basal diet with 20% wet distillers grains (WDGS) replacing DRC. In Exp. 2, DCAD was adjusted to -2, -12, and -22 mEq per 100 g of DM from the basal diet (DCAD = +8) and DCAD was adjusted in Exp. 3 to -12, -22, and -32 mEq per 100 g of DM from the basal WDGS diet (DCAD = -2). Urinary pH decreased linearly as DCAD decreased (P 0.11) among treatments in either experiment. Manure pH (soil, feces, and urine) was decreased (P < 0.01) in pens fed NEG compared with POS in both experiments. Amount of N lost (kg/steer) was not different (P = 0.44) in Exp. 5, but tended (P = 0.09) to be 10.6% greater for POS compared with NEG in Exp. 6. Urinary pH was decreased by reducing DCAD, but this had minimal effect on N losses in open feedlot pens in these experiments. [PUBLICATION ABSTRACT]
机译：进行了六个实验，以评估浓缩日粮中尿液pH，肥育性能和氮素质量平衡的日粮阳离子-阴离子差异（DCAD）。在实验中在五个3 x 3拉丁方格中，分别向1、15只羔羊羔（33.5±3.0千克）饲喂82.5％的干轧玉米（DRC），7.5％的苜蓿干草，5％的糖蜜和5％的不同比例的基础饲料阴离子和阳离子盐。每100克DM的DCAD为-45，-24，-16，-8、0，+ 8，+ 16，+ 24，+ 32和+40 mEq（含对照基础饮食（DCAD = +8））在每个广场。随着DCAD的增加，尿液pH值增加（立方，P <0.01），而DMI随DCAD的增加线性增加（P <0.01）。在实验中如图2和图3所示，在2个连续的4 x 4拉丁方块中使用了8个荷斯坦牛ste牛皮（312±24公斤）。饲喂Exp牛皮的基本饮食与实验相同。 1或以20％湿酒糟（WDGS）代替DRC的基础饮食。在实验中参照图2，将DCAD的基础饮食中每100 g DM的DCAD调整为-2，-12和-22 mEq（DCAD = +8），并在Exp中将DCAD调整为。从基础WDGS饮食中每100克DM 3至-12，-22和-32 mEq（DCAD = -2）。在两个实验中，随着DCAD的降低，尿液的pH均呈线性下降（P 0.11）。在两个实验中，与POS相比，NEG饲喂的猪粪中的pH值（土壤，粪便和尿液）降低了（P <0.01）。氮素损失量（公斤/转向）与实验值无差异（P = 0.44）。 5，但与Exp中的NEG相比，POS的（P = 0.09）往往高出10.6％。 6.通过降低DCAD降低了尿液的pH值，但是在这些实验中，这对开放式育肥圈中的N损失影响最小。 [出版物摘要]

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