Liveweight gain and feed intake of weaned Bali cattle fed a range of diets in Central Sulawesi, Indonesia

2012 ◽  
Vol 52 (7) ◽  
pp. 630 ◽  
Author(s):  
Marsetyo ◽  
Damry ◽  
S. P. Quigley ◽  
S. R. McLennan ◽  
D. P. Poppi
Keyword(s):  
Corn Stover ◽  
Rice Bran ◽  
Water Intake ◽  
Growth Rates ◽  
Elephant Grass ◽  
Native Grass ◽  
Copra Meal ◽  
Ad Libitum ◽  
Bali Cattle ◽  
Entire Male

Three experiments were conducted to determine liveweight (W) gain and feed and water intake of weaned Bali cattle offered a range of feed types. In each experiment, 18 weaned entire male Bali cattle were allocated to three treatment groups in a completely randomised block design, with six replicates (animals) per treatment. The dietary treatments were: Experiment 1, native grass fed ad libitum, native grass supplemented with rice bran at 10 g dry matter (DM)/kg W.day and native grass supplemented with a mixture of rice bran and copra meal in equal proportions fed at 10 g DM/kg W.day; Experiment 2, elephant grass hay fed ad libitum, elephant grass supplemented with gliricidia at 10 g DM/kg W.day, and gliricidia fed ad libitum; and Experiment 3, corn stover fed ad libitum, corn stover supplemented with gliricidia at 10 g DM/kg W.day, and corn stover supplemented with rice bran/copra meal in equal amounts (w/w) at 10 g DM/kg W.day. Each experiment was 10 weeks in duration, consisting of a 2-week preliminary period for adaptation to diets and an 8-week experimental period for the measurement of W change, feed and water intake and digestibility of the diet. Growth rates of 6–12-month-old, entire male Bali cattle fed a range of local diets ranged from 0.10 and 0.40 kg/day. Lowest growth rates occurred when the cattle were given the basal diets of native grass (0.104 kg/day), elephant grass (0.174 kg/day) and corn stover (0.232 kg/day). With the addition of supplements such as rice bran, rice bran/copra meal or gliricidia to these basal diets liveweight gains increased to between 0.225 and 0.402 kg/day. Forage DM intake was reduced with these supplements by on average 22.6% while total DM intake was increased by an average of 10.5%. The growth rate on gliricidia alone was 0.269 kg/day and feed DM intake was 28.0 g/kg W.day. Water intake was not affected by supplement type or intake. In conclusion, inclusion of small quantities of locally available, high quality feed supplements provide small-holder farmers with the potential to increase growth rates of Bali calves from 0.1 to 0.2 kg/day, under prevailing feeding scenarios, to over 0.4 kg/day.

Liveweight gain and feed intake of weaned Bali cattle fed grass and tree legumes in West Nusa Tenggara, Indonesia

2014 ◽  
Vol 54 (7) ◽  
pp. 915 ◽  
Author(s):  
Dahlanuddin ◽  
O. Yanuarianto ◽  
D. P. Poppi ◽  
S. R. McLennan ◽  
S. P. Quigley
Keyword(s):  
Rice Bran ◽  
Block Design ◽  
The Other ◽  
Native Grass ◽  
Tree Legumes ◽  
Bos Javanicus ◽  
Chest Girth ◽  
Metabolisable Energy ◽  
Bali Cattle ◽  
Entire Male

Two experiments were conducted with weaned entire male Bali cattle (Bos javanicus) between 6 and 12 months of age. A randomised block design was used in both experiments, which consisted of four treatments (diets), with five replicates (animals) per treatment. In both experiments, the average daily liveweight gain (LWG), feed and water intake and diet digestibility were determined over 8 or 10 weeks, with chest girth and wither height measured at the commencement and end of the experiments. In Experiment 1, the treatments were fresh native grass, native grass supplemented with fresh sesbania, fresh sesbania and fresh sesbania supplemented with rice bran. In Experiment 2, the treatments were sole diets of leucaena hay, sesbania hay, moringa hay or gliricidia hay supplemented with sesbania hay. In Experiment 1, animals fed sesbania supplemented with rice bran had higher DM intake than did animals fed the other three diets. DM digestibility (DMD) was significantly lower for weaners fed the native grass diet than for those fed the other diets. Animals fed sesbania or sesbania supplemented with rice bran had a higher LWG (0.34 and 0.43 kg/day, respectively) and estimated metabolisable energy (ME) intake (0.71 and 0.80 MJ of ME/kg W0.75.day, respectively) than did animals fed native grass alone (0.03 kg/day; 0.58 MJ of ME/kg W0.75.day) or native grass supplemented with sesbania (0.07 kg/day; 0.64 MJ of ME/kg W0.75.day). In Experiment 2, animals fed gliricidia hay had the lowest DM intake. DM intake of animals fed moringa hay was higher than that of animals fed gliricidia hay, but lower than the intake of animals fed sesbania hay or leucaena hay. DMD of the sesbania and leucaena hay diets was lower than that of the gliricidia and moringa hay diets. Animals fed leucaena and sesbania hays had a higher LWG (0.47 and 0.43 kg/day, respectively) and estimated ME intake (0.75 and 0.78 MJ of ME/kg W0.75.day, respectively) than did animals fed moringa hay (0.22 kg/day; 0.66 MJ ME/kg W0.75.day) or gliricidia hay supplemented with sesbania hay (0.0 kg/day; 0.48 MJ ME/kg W0.75.day). In conclusion, tree legumes can safely be fed to growing Bali cattle as the sole component of the diet and some of them will increase LWGs above that of native grasses, which are typically fed to Bali cattle in villages.

Rice bran as a supplement to elephant grass for cattle and buffalo in Indonesia: 1. Feed intake, utilization and growth rates

1983 ◽  
Vol 100 (3) ◽  
pp. 709-716 ◽  
Author(s):  
J. B. Moran
Keyword(s):  
Rice Bran ◽  
Feed Intake ◽  
Growth Rates ◽  
Dry Matter ◽  
Metabolizable Energy ◽  
Pennisetum Purpureum ◽  
Elephant Grass ◽  
Feed Conversion ◽  
Nitrogen And Phosphorus ◽  
Daily Intakes

SUMMARYIndonesian Ongole and swamp buffalo bulls were fed ad libitum a diet of elephant grass (Pennisetum purpureum) with five levels of rice bran (0, 1·2, 2·4, 3·6 and 4·8 kg/head/ day) in a study lasting 161 days. Measurements were made of the digestibility of the diet, the balances of nitrogen, phosphorus, calcium and water and the metabolizability of the gross energy. Using multiple regressions, the daily intakes of metabolizable energy were partitioned between maintenance and growth.Feeding rice bran stimulated appetite, initially improved feed conversion efficiency and increased growth rates. Each additional kilogram of rice bran fed depressed grass dry-matter intake by 0·8 kg in the buffaloes and 0·6 kg in Ongoles. Rice bran had little effect on digestibility of dry matter, organic matter and energy. Metabolizable energy contents of rice bran and elephant grass were calculated to be, respectively, 9·5 and 8·2 MJ/kg dry matter. Nitrogen and phosphorus status was improved in the supplemented animals but the balance of calcium was adversely affected. Voluntary feed intake was always higher in the buffaloes but the differences were reduced with increasing rice-bran supplementation.Metabolizable energy requirements for maintenance and growth did not differ significantly between Ongole and buffaloes and were similar to values calculated for British animals.

Evaluation of village-based diets for increasing the weight and condition of Ongole (Bos indicus) and Bali (Bos javanicus) cows in Indonesia

2014 ◽  
Vol 54 (9) ◽  
pp. 1368 ◽  
Author(s):  
R. Antari ◽  
T. M. Syahniar ◽  
D. E. Mayberry ◽  
Marsetyo ◽  
D. Pamungkas ◽  
...  
Keyword(s):  
Rice Straw ◽  
Rice Bran ◽  
Block Design ◽  
Bos Indicus ◽  
Pennisetum Purpureum ◽  
Feeding Strategies ◽  
Adaptation Period ◽  
Elephant Grass ◽  
Bos Javanicus ◽  
Ad Libitum

The aim of this research was to compare different feeding strategies to increase the weight and body condition score (BCS) of Ongole (Bos indicus) and Bali (Bos javanicus) cows kept by smallholder farmers in Indonesia. Thirty mature, non-pregnant, non-lactating Ongole and Bali cows were allocated to one of three treatment groups in a randomised block design, with five cows of each breed per treatment. The experiment consisted of a 2-week adaptation period and 24-week experimental period. In Weeks 1–17 cows were offered one of three diets; rice straw ad libitum plus gliricidia (Gliricidia sepium) at 3 g DM/kg W.day (RSG3), rice straw at 10 g DM/kg W.day plus gliricidia at 10 g DM/kg W.day, or elephant grass (Pennisetum purpureum) ad libitum. During Weeks 18–24 the cows previously fed the RSG3 diet were offered rice straw ad libitum plus rice bran at 10 g DM/kg W.day. There was no change to diets of the other groups. Feeding untreated rice straw plus gliricidia or rice bran only provided enough metabolisable energy for maintenance of both breeds. Ongole and Bali cows consuming elephant grass gained weight at 0.25 and 0.33 kg/day, respectively. However, even at these higher growth rates it would still take ~4–6 months for cows to gain 1 BCS unit (1–5 scale). Maintaining a good BCS would be a better management strategy.

Insulin secretion, body composition and pig performance are altered by feeding pattern

2014 ◽  
Vol 54 (3) ◽  
pp. 319 ◽  
Author(s):  
Ronald E. Newman ◽  
Jeffery A. Downing ◽  
Peter C. Thomson ◽  
Cherie L. Collins ◽  
David J. Henman ◽  
...  
Keyword(s):  
Insulin Secretion ◽  
Feed Intake ◽  
Plasma Insulin ◽  
Feeding Strategy ◽  
Growing Pigs ◽  
Carcass Composition ◽  
Production Performance ◽  
Feed Conversion ◽  
Ad Libitum ◽  
Entire Male

Three studies investigated the effect of feeding strategy on production performance and endocrine status of growing pigs. For Experiment 1, 20 entire male pigs (70.0 ± 4.6 kg) were allocated randomly to individual pens in one of four climate-controlled rooms. Pigs were fed for 23 days either ad libitum or entrained to feed bi-phasically for two 90-min periods. For Experiment 2, 20 entire male pigs (41.2 ± 3.5 kg) were housed as per Experiment 1. Pigs were fed for 49 days either ad libitum or fed bi-phasically for two 60-min periods. For Experiment 3, 100 female pigs (66.1 ± 3.5 kg) were randomly allocated to individual pens within a commercial piggery and fed for 42 days either ad libitum or bi-phasically for two 60-min periods. Ear vein catheters were inserted into 10 pigs from each group and hourly blood samples were collected for 24 h in Experiments 1 and 2 and for 11 h in Experiment 3. Plasma insulin, non-esterified fatty acid and glucose concentrations were determined in Experiments 1 and 2, and glucose and insulin concentrations in Experiment 3. Feed intake and performance were recorded in all experiments and carcass composition was assessed by computed tomography for Experiment 2. There were no differences in final liveweight between the two treatment groups for all experiments. Pigs fed for two 90-min periods (Experiment 1) showed no difference in feed intake when compared with feeding ad libitum. Pigs in Experiment 2 fed for two 60-min intervals consumed 2.49 kg/pig.day compared with those fed ad libitum that consumed 2.68 kg/day (P = 0.057). In Experiment 3, pigs fed twice daily consumed 2.82 kg/pig.day compared with 2.91 kg/pig.day in ad libitum-fed pigs (P = 0.051). Bi-phasic fed pigs in Experiment 2 had improved (P < 0.05) feed conversion efficiency compared with pigs fed ad libitum. For all experiments, there was no difference in plasma glucose concentrations between the two treatments. In all three experiments, the circulating insulin concentrations for pigs fed ad libitum remained at a constant level throughout the sampling period. However, plasma insulin concentrations for the bi-phasic fed pigs significantly increased ~1 h after both feeding periods during all three experiments. Insulin secretion of pigs fed for two 90-min periods differed from that of pigs fed for two 60-min periods. Plasma insulin concentration increased five-fold following feeding for 60 min, compared with that in pigs fed for 90 min, which increased two-fold. Bi-phasic-fed pigs from Experiment 2 had reduced (P < 0.05) total carcass fat and significantly increased muscle when compared with pigs fed ad libitum. The data showed that feeding pigs at two succinct periods aligned insulin secretion to the time of feeding. Pigs fed for 60 min, unlike those fed for 90-min intervals, had reduced feed intake in comparison to those fed ad libitum. This may suggest that the duration of the feeding bout is important for this response and this may in turn influence both energy balance and the way energy is partitioned.

Rice bran as a supplement to elephant grass for cattle and buffalo in Indonesia: 2. Carcass development, energy accretion and its effect on feed efficiency: 2. Carcass development, energy accretion and its effect on feed efficiency

1983 ◽  
Vol 100 (3) ◽  
pp. 717-722
Author(s):  
J. B. Moran
Keyword(s):  
Weight Gain ◽  
Rice Bran ◽  
Feed Efficiency ◽  
Live Weight ◽  
Metabolizable Energy ◽  
Regression Equations ◽  
Elephant Grass ◽  
Live Weight Gain ◽  
Fat Depots ◽  
Gross Energy

SUMMARYIndonesian Ongole and swamp buffalo bulls that had previously been given 0, 1·2, 2·4, 3·6 or 4·8 kg/head/day rice bran plus ad libitum elephant grass were slaughtered after 161 days feeding. Abdominal depot fat, full and empty reticulo-rumen and cold carcass weights were recorded. Various carcass variables were measured and the 9–10–11 rib joints were dissected into bone, muscle and fat. Carcass gross energy was calculated from rib-fat content using previously determined regression equations. Feed efficiency was expressed in terms of the ratios of live-weight gain or carcass-energy accretion to metabolizable energy available for growth.Increasing supplementation with rice bran resulted in larger abdominal fat depots, higher dressing percentages, increased carcass fatness (and hence carcass gross energy) and improved rib muscle to bone ratios. Carcass conformation was unaffected by dietary treatment. When feed efficiency was expressed per unit live-weight gain, there was a decrease with increasing rice-bran feeding. Feed efficiency, expressed per unit of carcass energy accretion, improved with rice-bran supplementation and was generally higher in buffalo than in Ongole bulls. Dietary and species differences in feed efficiency could be primarily explained by the differential energy cost of deposition of, and the availability of energy from, carcass protein and lipid.

scholarly journals A comparison of first-, second- and third-cut timothy silages in the diets of finishing beef bulls

2017 ◽  
Vol 26 (1) ◽  
pp. 16 ◽  
Author(s):  
Arto Kalevi Huuskonen ◽  
Maiju Pesonen
Keyword(s):  
Growth Rates ◽  
Present Experiment ◽  
Dry Matter ◽  
Carcass Characteristics ◽  
Feeding Experiment ◽  
The Third ◽  
Grass Silage ◽  
Ad Libitum ◽  
Dietary Treatments ◽  
Vitamin Mixture

The objective of the present experiment was to study the effects of the third-cut grass silage compared with the first- and second-cut silages on intake, performance and carcass characteristics of finishing bulls. A feeding experiment comprised 45 Simmental bulls which were fed a total mixed ration ad libitum. The three dietary treatments included either first-, second- or third-cut grass silage (550 g kg-1 dry matter), rolled barley (435 g kg-1 dry matter) and a mineral-vitamin mixture (15 g kg-1 dry matter). Dry matter and energy intakes and growth rates of the bulls increased when either first- or third-cut silages were used instead of the second-cut silage. This was probably due to differences in digestibility, which was the lowest in the second-cut silage. There were no differences in intake or growth between the first- and third-cut silage-based rations. No significant differences in carcass traits among the feeding treatments were observed.

scholarly journals EFISIENSI PENGGUNAAN RANSUM SAPI BALI JANTAN YANG DISUBTITUSI DENGAN AMPAS TAHU DAN DEDAK PADI FERMENTASI

2015 ◽  
Vol 2 (1) ◽  
pp. 63
Author(s):  
Khoirul Mualimin ◽  
Natsir Sandiah ◽  
La Ode Ba'a
Keyword(s):  
Rice Bran ◽  
Feed Efficiency ◽  
Dry Matter ◽  
Animal Feed ◽  
Block Group ◽  
Animal Science ◽  
Group Design ◽  
Feed Control ◽  
Bali Cattle ◽  
Better Than

This research aims to know the efficiency of ration use of a male Bali cattle in substitution with tofu dregs and rice bran fermentation. This research was conducted during nine weeks in Nutrition and Animal Feed Laboratory of Animal Science Department of Animal Science Faculty, Halu Oleo University, Kendari, and in Alebo Village of Konda Subdistrict of South Konawe Regency. The treatments were R0 = concentrate without fermentation-based feed (control), R1 = rice bran fermnetation-based concentrate 50%, R2 = rice bran fermnetation-based concentrate 55%, R3 = rice bran fermnetation-based concentrate 60%. The experimental design used in this study was randomly group design with 4 traetments and 3 block/group. The result of variance analysis showed that dry matter concumption was not differ markedly (p>0,05), which justifies the dry matter concumption is average from the highest to the lowest is R1 (5,143 kg/cattle/day), R0 (5,063 kg/cattle/day), R3 (4,907 kg/cattle/day) and R2 (4,905 kg/cattle/day). The substitution tofu dregs know and rice bran fermentation to 60% in ration not effect real (p>0,05) addition average daily againt of a male Bali cattle, but in quantitative R3 rations give a good response better than R0, R1 and R2 (0,542 kg/cattle/day than 0,402 kg/cattle/day, 0,411 kg/cattle/day and 0,435 kg/cattle/day). While the efficiency of used R3 rations (10,888%) higher than R2 (9,027%), R1 (8,080%) and R0 (8,075%). Conclusion that in substitution tofu dregs and rice bran fermentation to 60% in rations can give a good the efficiency of ration used of a male Bali cattle.Key Words: Bali cattle, dry matter consumption, feed efficiency, rice bran fermentationABSTRAKPenelitian ini bertujuan untuk mengetahui efisiensi penggunaan ransum sapi Bali jantan yang disuntitusi dengan ampas tahu dan dedak padi fermentasi. Penelitian ini dilaksanakan selama sembilan minggu di Laboratorium Ilmu Nutrisi dan Makanan Ternak Jurusan Peternakan Fakultas Peternakan Universitas Haluoleo Kendari dan di desa Alebo kecamatan Konda Kabupaten Konawe Selatan. Perlakuan yang dicobakan adalah R0= konsentrat berbasis pakan tanpa fermentasi (kontrol), R1= konsentrat berbasis dedak padi fermentasi 50%, R2= konsentrat berbasis dedak padi fermentasi 55% dan R3= konsentrat berbasis dedak padi fermentasi 60%. Rancangan percobaan yang digunakan adalah Rancangan Acak Kelompok (RAK) dengan 4 perlakuan dan 3 ulangan (blok/kelompok). Hasil analisis ragam menunjukkan bahwa dengan subtitusi ampas tahu dan dedak padi fermentasi sampai 60% dalam ransum tidak berpengaruh nyata (p>0,05) terhadap pertambahan bobot badan sapi Bali jantan, akan tetapi secara kuantitaif ransum R3 memberikan respon yang lebih baik dibanding R0, R1 dan R2 (0,542 kg/ekor/hari dibanding 0,402 kg/ekor/hari, 0,411 kg/ekor/hari dan 0,435 kg/ekor/hari). Konsumsi bahan kering ransum tidak berbeda nyata (p>0,05), dimana rataan konsumsi bahan kering dari yang tertinggi sampai terendah adalah R1 (5,143 kg/ekor/hari), R0 (5,063 kg/ekor/hari), R3 (4,907 kg/ekor/hari) dan R2 (4,864 kg/ekor/hari). Sedangkan efisiensi penggunaan ransum R3 (10,888%) lebih tinggi dibandingkan R2 (9,027%), R1 (8,080%) dan R0 (8,075%). Kesimpulan bahwa subtitusi dedak padi fermentasi sampai 60% dalam ransum dapat memberikan efisiensi penggunaan ransum sapi Bali jantan yang lebih baik.Kata Kunci: Sapi Bali, PBB, Konsumsi bahan kering, Efisiensi ransum, Dedak padi fermentasi

scholarly journals High water vs. ad libitum water intake for autosomal dominant polycystic kidney disease: a randomized controlled feasibility trial

QJM ◽  
2019 ◽  
Vol 113 (4) ◽  
pp. 258-265 ◽  
Author(s):  
R El-Damanawi ◽  
M Lee ◽  
T Harris ◽  
L B Cowley ◽  
S Bond ◽  
...  
Keyword(s):  
Kidney Disease ◽  
Polycystic Kidney Disease ◽  
Water Intake ◽  
Autosomal Dominant ◽  
High Water ◽  
Feasibility Trial ◽  
Polycystic Kidney ◽  
High Water Intake ◽  
Ad Libitum ◽  
Autosomal Dominant Polycystic Kidney

Abstract Background Vasopressin stimulates cyst growth in autosomal dominant polycystic kidney disease (ADPKD) and is a key therapeutic target. Evaluation of high water intake as an alternative to pharmacological vasopressin blockade is supported by patients. However feasibility, safety and adherence-promoting strategies required to deliver this remain unknown. Aims Assess the feasibility of a definitive randomized high water intake trial in ADPKD. Methods In this prospective open-label randomized trial, adult ADPKD patients with eGFR ≥ 20 ml/min/1.73 m2 were randomized to prescribed high water (HW) intake targeting urine osmolality (UOsm) ≤270 mOsm/kg, or ad libitum (AW) intake (UOsm &gt;300 mOsm/kg). Self-management strategies including home-monitoring of urine-specific gravity (USG) were employed to promote adherence. Results We enrolled 42 participants, baseline median eGFR (HW 68.4 [interquartile range (IQR) 35.9–107.2] vs. AW 75.8 [IQR 59.0–111.0 ml/min/1.73 m2, P = 0.22) and UOsm (HW 353 [IQR 190–438] vs. AW 350 [IQR 240–452] mOsm/kg, P = 0.71) were similar between groups. After 8 weeks, 67% in the HW vs. 24% in AW group achieved UOsm ≤270 mOsm/kg, P = 0.001. HW group achieved lower UOsm (194 [IQR 190–438] vs. 379 [IQR 235–503] mOsm/kg, P = 0.01) and higher urine volumes (3155 [IQR 2270–4295] vs. 1920 [IQR 1670–2960] ml/day, P = 0.02). Two cases of hyponatraemia occurred in HW group. No acute GFR effects were detected. In total 79% (519/672) of USG were submitted and 90% (468/519) were within target. Overall, 17% withdrew during the study. Conclusion DRINK demonstrated successful recruitment and adherence leading to separation between treatment arms in primary outcomes. These findings suggest a definitive trial assessing the impact of high water on kidney disease progression in ADPKD is feasible.

Value of fluid and electrolyte supplements in subarctic survival situations

1964 ◽  
Vol 19 (4) ◽  
pp. 580-582 ◽  
Author(s):  
Terence A. Rogers ◽  
James A. Setliff
Keyword(s):  
Water Intake ◽  
Fluid Balance ◽  
Cold Exposure ◽  
High Water ◽  
The Other ◽  
Standard Diet ◽  
High Water Intake ◽  
Ad Libitum

After 48 hr on a standard diet indoors, 30 men were subjected to cold and starvation in the winter subarctic. During the fast, ten men got 230 mEq NaCl each, ten got 115 mEq NaCl plus 115 mEq NaHCO3, and the other ten got a placebo. Of each group of ten, five had water ad libitum and the other five each had a “forced” intake of 1,920 ml. In each electrolyte-supplemented group, those with the high water intake dehydrated to the same extent as those drinking ad libitum. Those getting NaCl or NaCl plus NaHCO3 lost a mean of about 1 kg less weight than those in the placebo groups. The NaHCO3 did not diminish the fasting acidosis. cold exposure; fasting; fluid balance; starvation Submitted on January 22, 1964

Effect of water restriction on urinary concentrating ability of K-depleted rats

1960 ◽  
Vol 199 (5) ◽  
pp. 912-914 ◽  
Author(s):  
William B. Blythe ◽  
Margaret Newton ◽  
Fernando Lazcano ◽  
Louis G. Welt
Keyword(s):  
Water Intake ◽  
The Other ◽  
Potassium Depletion ◽  
Water Restriction ◽  
Control Groups ◽  
Ad Libitum ◽  
Urinary Concentrating Ability ◽  
Excessive Water ◽  
Urine Concentrating Ability ◽  
Concentrating Defect

In order to test the possibility that the urinary concentrating defect associated with potassium depletion results from excessive water intake that accompanies potassium depletion, water intake was restricted in one half of a group of rats undergoing potassium depletion. The other one half of the group was allowed to drink ad libitum After 14 days, ability to concentrate the urine was tested in both groups as well as in two groups of control rats, one of which was allowed to drink ad libitum and the other having water intake restricted. Although both potassium-depleted groups concentrated urine less than the control groups, there was no difference in urine-concentrating ability between the two potassium-depleted groups. It is concluded that the urinary concentrating defect in potassium depletion is not due to excessive water intake.

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