Dietary Zinc Requirement of Young Giant Gouramy (Osphronemus gouramy, Lac.)

This experiment was conducted to determine the dietary zinc requirement of young giant gouramy. Five experimental diets were used in this experiment containing iso-nitrogenous and iso-energy with different levels of zinc (0, 25, 50, 100, and 200 mg per kg). The initial means of body weight of body the fishes was 0.82 g per individual. The fishes were fed upon the diets at satiation, three times daily, for 12 weeks. The results indicated no zinc deficiency symptoms in this experiment. The daily growth rate, feed efficiency, survival rates and protein and lipid retention were not significantly different from all the diets. However, fish fed upon 25 mg Zn/kg diets produced the highest protein and total digestibility. The zinc contents of 25 mg Zn/kg diets gave the highest value in zinc accumulation in the bone, blood serum and eyes. The highest accumulation of the zinc in the liver occurred in 50 mg Zn/kg diets. There was increase in zinc content of the tissues after increasing levels of dietary zinc. Thus, Zn requirement for juvenile of giant gouramy was 25-50 mg/kg diets. Keywords: Osphronemus gouramy, Zinc, diet ABSTRAK Penelitian ini dilakukan untuk mengetahui kebutuhan seng dalam pakan untuk benih ikan gurame. Lima jenis pakan percobaan yang diuji mengandung iso-nitrogen dan iso-energi dengan kadar seng (Zn) yang berbeda (0, 25, 50, 100, and 200 mg per kg). Bobot rata-rata benih yang digunakan adalah 0,82 g per ekor. Ikan dipelihara selama 12 minggu dan diberi pakan 3 kali sehari. Hasil penelitian menunjukkan bahwa tidak ada gejala defisiensi Zn. Laju pertumbuhan harian, efisiensi pakan, kelangsungan hidup dan rentesi protein dan lemak tidak berbeda nyata untuk semua perlakuan. Namun demikian, ikan yang diberi Zn sebanyak 25 mg/kg pakan menghasilkan kecernaan total dan protein tertinggi. Perlakuan tersebut juga menghasilkan akumulasi Zn tertinggi dalam tulang, serum darah dan mata. Akumulasi Zn tertinggi dalam hati diperoleh pada perlakuan 50 mg Zn/kg pakan. Kandungan Zn dalam jaringan meningkat sejalan dengan meningkatnya kadar Zn dalam pakan. Dengan demikian, kebutuhan Zn bagi benih ikan gurame adalah sebanyak 25-50 mg /kg pakan. Kata kunci: Osphronemus gouramy, seng, pakan

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Effect of periodic fasting on growth and feed efficiency in Giant Freshwater Prawn (Macrobrachium rosenbergii, de Man 1879)

Indonesian Journal of Tropical Aquatic ◽

10.22219/ijota.v2i2.6679 ◽

2019 ◽

Vol 2 (2) ◽

pp. 53

Author(s):

Waskito Dwi Utomo ◽

Riza Rahman Hakim ◽

Ganjar Adhywirawan Sutarjo

Keyword(s):

Growth Rate ◽

Feed Efficiency ◽

Macrobrachium Rosenbergii ◽

Freshwater Prawn ◽

High Price ◽

Daily Growth Rate ◽

Daily Growth ◽

Absolute Weight ◽

Weight Growth ◽

De Man

There are obstacles in the aquaculture business that is still often facedbyfarmers, one of the challengesisthe high price of commercial feed. Feed as an energy source for growth is a reasonably high-cost component in production that reaches 40-89 %. In the control of food for efficiency, it could be done by the fasting method. This research was aimedtoanalyze the effect of periodic fastedofgiant prawn (Macrobrachium rosenbergii de Man, 1879) against growth and feed efficiency. This research was conducted at IBAP Installation, Probolinggo District - East Java Province. The experimental method used completely randomized design with five treatments and three replications, such as; P0: feeding without fasting (as control), P1: a-day fasted, a-day feeding, P2: a-day fasted, two-days feeding, P3: a-day fasted, three-day feeding, P4: a-day fasted, four-days feeding, P5: a-day fasted, five-day feeding. The results showed that periodic fasted of M. rosenbergii no significant effect on the daily growth rate, absolute weight growth, and feed efficiency. However, by looking at the rate of growth, thisfasting methodcouldbe used as an alternative to saving feed. The P5 showed the most effective in increasing daily growth rate, absolute weight growth, and effectiveness of giant prawn feeding. The strategy of periodic fasted to increase the production of giant prawns should consider the other supporting factors such as ideal water quality (pH, temperature, and DO), proper stocking density, and feeding periods on schedule.

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Effect of Hardness in 3 ppt of Water Salinity on growth and survival rates of Barb Fish (Barbus conhonius Hamilton-Buchanan)

Jurnal Akuakultur Indonesia ◽

10.19027/jai.4.17-24 ◽

2007 ◽

Vol 4 (1) ◽

pp. 17 ◽

Cited By ~ 1

Author(s):

Kukuh Nirmala ◽

R. Wulandari ◽

D. Djokosetiyanto

Keyword(s):

Growth Rate ◽

Survival Rate ◽

Survival Rates ◽

Water Hardness ◽

Water Salinity ◽

Daily Growth Rate ◽

Daily Growth ◽

Growth And Survival

This study was conducted to determine the effect of hardness on growth and survival rate of barb fish (Barbus conchonius Hamilton-Buchanan) reared in the 3 ppt of water salinity. Fish were reared in three different hardnesses, i.e., 54, 72, and 90 mg/L CaCO3 for 30 days. The results of study showed that fish reared in water hardness of 72 mg/L CaCO3 had higher daily growth rate (1.15%) compared with other treatments. Daily growth rate of fish reared in water hardness of 54 and 90 mg/L CaCO3 were 0.76 and 0.37%, respectively. There was no effect of hardness on survival rate of barb fish. Keywords: barb fish, Barbus conchonius, hardness, salinity ABSTRAK Penelitian ini bertujuan untuk mengetahui pengaruh kesadahan yang berbeda terhadap laju pertumbuhan dan tingkat kelangsungan hidup ikan barbir (Barbus conchonius Hamilton-Buchanan) yang dipelihara <a name="OLE_LINK2"></a><a name="OLE_LINK1">pada air bersalinitas 3 ppt. </a>Ikan dipelihara dalam 3 tingkat kesadahan yang berbeda, yaitu 54 mg/L CaCO3, 72 mg/L CaCO3, dan 90 mg/L CaCO3 selama 30 hari. Hasil penelitian menunjukkan bahwa laju perumbuhan harian tertinggi diperoleh pada ikan yang dipelihara pada kesadahan 72 mg/L CaCO3 (1,15%) dibandingkan dengan perlakuan lainnya. Laju pertumbuhan harian ikan yang dipelihara pada kesadahan 54 dan 90 mg/L CaCO3 masing-masing mencapai 0,76% dan 0,37%. Kelangsungan hidup ikan barb tidak dipengaruhi oleh kesadahan. Kata kunci: ikan barbir, Barbus conchonius, kesadahan, salinitas

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Effect of Stocking Density on Growth and Survival Rate of Giant Gouramy (Osphrenemus gouramy Lac.) Seed

Jurnal Akuakultur Indonesia ◽

10.19027/jai.8.199-207 ◽

2009 ◽

Vol 8 (2) ◽

pp. 199 ◽

Cited By ~ 3

Author(s):

S. Sarah ◽

. Widanarni ◽

Agus Oman Sudrajat

Keyword(s):

Growth Rate ◽

Survival Rate ◽

Feed Efficiency ◽

Stocking Density ◽

Individual Growth ◽

Daily Growth Rate ◽

Daily Growth ◽

Fish Yield ◽

Growth And Survival ◽

Individual Growth Rate

This experiment was conducted to study the stocking density effect on growth and survival rate of giant gouramy seed in the aquarium. Fish were stocked at the density of 2.5; 5.0; 7.5 and 10 individual/l with average initial weight and length were 0.013 g and 5.56 mm, respectively. Fish were fed with silkworm (Tubifex sp.) ad libitum in the morning and evening for 22 days of experiment. Aquarium was siphoned and water was changed everyday for maintaining good water quality. Result showed that survival rate remain high in all treatment (93.5 - 95.5%). Increasing stocking density from 2.5 to 10 individual/I did not affect survival rate. On the other hand growth rate and feed efficiency decreased, while fish yield increased. Stocking density of 2,5 individual/l gave the highest daily growth rate, individual growth rate, growth in length and feed efficiency of 12.94%, 0.0081 g/day, 16.84 mm and 12.51%; respectively. The highest value for fish yield (0,0360 g/l/day) was obtained from stocking density of 10 individual/l Key words: stocking density, seed, survival rate, growth rate, giant gouramy Osphrenemus goramy ABSTRAK Keterbatasan pengadaan benih ikan gurame (Osphronemus gourame Lac.) disebabkan oleh tidak seimbangnya jumlah benih yang tersedia dengan kebutuhan usaha pembesaran. Teknik pembenihan yang digunakan sampai saat ini relatif sederhana dengan cara tradisional. Pemeliharaan gurame secara terkontrol di akuarium dapat menjawab tantangan dalam teknologi pembenihan gurame sekaligus sebagai sarana pola budidaya secara bertahap yang sedang berkembang saat ini. Produksi yang tinggi akan dicapai dengan pemeliharaan pada kepadatan yang tinggi. Pada keadaan lingkungan yang baik dan pakan yang mencukupi, peningkatan kepadatan akan disertai dengan peningkatan hasil. Jumlah ikan yang ditebar pada penelitian ini disesuaikan berdasarkan perlakuan yaitu 2,5; 5,0; 7,5 dan 10 ekor/l. Pengamatan terhadap ikan dilakukan sampai hari ke-22. Hasil pengamatan menunjukkan bahwa peningkatan kepadatan 2,5 - 10 ekor/l pada pemeliharaan benih gurame di akuarium mempengaruhi pertumbuhan, hasil dan efisiensi pakan, namun tidak berpengaruh terhadap kelangsungan hidup. Dengan meningkatnya padat penebaran, laju pertumbuhan dan efisiensi pakan semakin menurun, sedangkan hasil (yield) semakin meningkat. Padat penebaran 2,5 ekor/l menghasilkan laju pertumbuhan harian, laju pertumbuhan individu, pertumbuhan panjang mutlak dan efisiensi pakan tertinggi, masing-masing mencapai 12,94 %, 0,0081 g/hari, 16,84 mm dan 12,51 %. Sedangkan nilai tertinggi untuk hasil (yield) sebesar 0,0360 g/l/hari diperoleh pada padat penebaran 10,0 ekor/l. Kata kunci : padat tebar, pembenihan, gurame dan Osphronemus gouramy

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Growth of green catfish seed fed on sludge worm and artificial feed combination

Jurnal Akuakultur Indonesia ◽

10.19027/jai.12.18-24 ◽

2014 ◽

Vol 12 (1) ◽

pp. 18

Author(s):

Netti Aryani ◽

Niken Ayu Pamungkas ◽

. Adelina

Keyword(s):

Growth Rate ◽

Body Weight ◽

Survival Rate ◽

Artificial Diet ◽

Daily Growth Rate ◽

Daily Growth ◽

Growth And Survival ◽

Absolute Length ◽

The Absolute ◽

Mystus Nemurus

ABSTRACT This research aimed to obtain information of growth and survival of green catfish (Mystus nemurus) juvenile fed with sludge worm (Tubifex sp.; T) and artificial diet (PB) and added with the combination of 50% soybean pulp waste and 50% freshwater trash fish. Feeding was performed in several variation of time during 40 days of fish rearing. Average body length of juvenile was 12 mm and weight 2.8±0.0 mg, maintained at a density of 30 individuals/aquarium. The treatment in this research was T10PB30 (8–18 days old juvenile were fed with sludge worm and 18–48 days old fish were fed with artificial diet), T20PB20 (8–28 days old juvenile were fed with sludge worm and 28–48 days old were fed with artificial diet), T30PB10 (8–38 days old juvenile were fed with sludge worm and 38–48 days old were given artificial diet), PB40 (8–48 days old juvenile were fed artificial diet), T40 (8–48 days old juvenile were fed with sludge worm). The results indicated that the treatment of 40 days feeding with sludge worm provided the best growth and survival as daily growth rate of 16.4±28.0 g/day, the growth of the absolute length was 43.60±0.01 mm, the absolute body weight 2,047.2±35.0 mg and the survival rate was 96.44%. The best artificial feeding treatment was feeding with sludge worm for 30 days and with 10 days of artificial diet, results in daily growth rate of 4.53±0,25 mm/day, the growth of the absolute length 40.00±0.04 mm, the absolute body weight 1,447.2±15.0 mg, and the survival rate 94.44±2.60%. Keywords: artificial feed, sludge worm, growth, green catfish ABSTRAK Penelitian ini bertujuan untuk mendapatkan informasi pertumbuhan dan sintasan benih ikan baung (Mystus nemurus) dengan pemberian cacing sutra (Tubifex sp.; T) dan pakan buatan (PB) kombinasi 50% limbah ampas tahu dan 50% ikan rucah air tawar. Pakan diberikan dengan variasi lama waktu berbeda selama pemeliharaan 40 hari. Rerata panjang awal benih adalah 12 mm dan bobot tubuh 2,8±0,0 mg, dipelihara dengan kepadatan 30 ekor/akuarium. Perlakuan dalam penelitian ini adalah T10PB30 (benih umur 8–18 hari diberi pakan cacing sutra dan umur 18–48 hari pakan buatan), T20PB20 (benih umur 8–28 hari diberi cacing sutra dan umur 28–48 pakan buatan), T30PB10 (benih umur 8–38 diberi pakan cacing sutra dan umur 38–48 diberi pakan buatan), PB40 (benih umur 8–48 hari diberi pakan buatan), T40 (benih umur 8–48 hari diberi pakan cacing sutra). Hasil penelitian ini menunjukkan bahwa perbedaan lama waktu pemberian cacing sutra dan pakan buatan yang terbaik adalah pemberian pakan cacing sutra selama 40 hari dengan laju pertumbuhan harian 16,4±28,0 g/hari, pertumbuhan panjang mutlak 43,60±0,01 mm, bobot mutlak 2.047,2±35,0 mg, dan sintasan 96,44%. Selanjutnya variasi lama waktu pemberian pakan buatan yang terbaik adalah pemberian cacing sutra selama 30 hari dan pakan buatan sepuluh hari dengan laju pertumbuhan harian sebesar 4,53±0,25 mm/hari, pertumbuhan panjang mutlak 40,00±0,04 mm, bobot mutlak 1.447,2±15,0 mg, dan sintasan 94,44±2,60%. Kata kunci: pakan buatan, cacing sutra, pertumbuhan, ikan baung

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Pertumbuhan benih ikan mas, Cyprinus carpio, yang diberi pakan dengan dosis dan frekuensi berbeda

e-Journal BUDIDAYA PERAIRAN ◽

10.35800/bdp.8.1.2020.27491 ◽

2020 ◽

Vol 8 (1) ◽

Author(s):

Tinus O O. Biduan ◽

Indra R. N. Salindeho ◽

Hariyani Sambali

Keyword(s):

Growth Rate ◽

Body Weight ◽

Cyprinus Carpio ◽

The Body ◽

Optimum Dose ◽

Daily Growth Rate ◽

Daily Growth ◽

Feeding Regime ◽

Significant Difference ◽

Recirculation System

The objectives of this research were to find out the optimum dose and frequency of feeding regime to ensure the maximum growth of carp-seeds, Cyprinus carpio, reared in the backyard pond with recirculation system. The experiment was carried out in 2x3 factorial experimental design and the experimental units were designed in randomized block. Two factors were tested in this experiment; the first factor, dose of feeding, had three levels, 3%, 4% and 5% of the total body weight per day; and the second factor had 2 levels, 2 and 3 times per day. Hence there were 6 treatments were applied, and each treatment was triplicated. Each repetition represented group of fish with different weight. There were 18 experimental units, and each experimental unit was composed of 8 tested fish, therefore there were 144 tested fish, which were weighed at the beginning of the experiment and then every week during the 6 weeks period of the experiment. The weight data were converted into FCR, absolute, relative and daily growth rate, and were statistically analyzed using JMP statistic-program (SAS-institute). The results showed the absolute growth of fish at dose of 3% was significantly lower than that of fish at the dose of 4% and 5%, which was not significantly different. The relative and daily growth rate was not significantly affected by the different dose of feeding regime. There was no significant difference in FCR, absolute, relative and daily growth rate between fish fed 2 and 3 times per day. The best FCR, 1,46, was performed by fish fed 3% of the body weight per day, and this value was significantly different with that of the fish fed 4% or 5%. The results of this experiment suggest that, carp reared in backyard pond with recirculation system should be fed twice a day, with a dose of 3% of the body weight each day.

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Substitusi Tepung Kedelai Dengan Tepung Biji Koro Pedang (Canavalia ensiformis) Terhadap Pertumbuhan, Survival Rate Dan Efisiensi Pakan Ikan Nila Merah [Substitution Of Soybean Meal With Sword Bean Seed Meal (Canavalia ensiformis) On Growth, Survival Rate And Feed Efficiency Of Red Tilapia]

Jurnal Ilmiah Perikanan dan Kelautan ◽

10.20473/jipk.v6i1.11357 ◽

2019 ◽

Vol 6 (1) ◽

pp. 7

Author(s):

Ega Centyana, Yudi Cahyoko, Agustono

Keyword(s):

Growth Rate ◽

Survival Rate ◽

Soybean Meal ◽

Feed Efficiency ◽

Seed Meal ◽

Bean Seed ◽

Daily Growth Rate ◽

Daily Growth ◽

Red Tilapia

Abstract Red tilapia is kind of freshwater culture fish is quite popular because it has several advantages compared with other types of freshwater fish. To fullfil the demand of red tilapia can be overcome by cultivation. Effort to increase the production of red tilapia is to improve the quality of feed. The purpose of this study was to try the effect of the use of sword bean seed meal on the growth rate, survival rate and feed efficiency of red tilapia. The research method is experimental with completely randomized design (CRD) with five treatments and four replications. The treatments used were: (A) sword beans seed meal at 0% and soybean meal by 50%, (B) 10% sword beans seed meal and 40% soybean meal, (C) 20% sword beans seed meal and 30% soybean meal, (D) 30% sword beans seed meal and 20% soybean meal and (E) 40% sword beans seed meal and 10% soybean meal. The main parameters that measured were growth, survival rate and feed efficiency. Secondary parameters measured were water quality. Analysis of the data using analysis of variance (ANOVA) and to know the difference between treatments using Duncan's Multiple Range Test. Results showed the administration of sword bean seed meal on feed rations provide a significantly different effect (p<0.05) on the growth and feed efficiency but not significantly on survival rate of red tilapia (p>0.05 ). Highest daily growth rate obtained on treatment B on feed containing 10% of sword bean meal (1.20 %) was significantly different than treatment A (1.02 %), C (0.88 %) , D (0.85 %) and E (0.75 %) . Lowest daily growth rate was treatment E that significantly different with treatment A and B but not significantly different with treatments C and D. Highest feed efficiency obtained on treatment B (30.29 %) was not significantly different than treatment A (27.56 %), C (25.95 %) and D (27.78 %). Lowest feed efficiency was treatment E (17.84 %) significantly different than treatment B. Subtitution of sword bean seed meal in feed rations gave result that was not significantly different effect on the level of survival of red tilapia. Water quality of red tilapia rearing media was temperature range between 25-28° C, pH 7-8, dissolved oxygen 2-5 mg/L and ammonia 1.5 to 3.0 mg/L.

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Growth Performance of Giant Gourami (Osphronemus goramy) Fingerlings Cultured in Circular Containers with Water Current

Asian Journal of Fisheries and Aquatic Research ◽

10.9734/ajfar/2020/v8i230135 ◽

2020 ◽

pp. 16-24

Author(s):

Rafi Satriawan ◽

. Iskandar ◽

B. S. Ibnu Bangkit ◽

Walim Lili

Keyword(s):

Growth Rate ◽

Feed Efficiency ◽

Feeding Rate ◽

Conversion Ratio ◽

Feed Conversion Ratio ◽

Water Current ◽

Feed Conversion ◽

Daily Growth Rate ◽

Daily Growth ◽

Weight Growth

This research aims to determine the application of different water currents in a round container that can provide the most optimal effect on the growth rate of giant gourami (Osphronemus goramy) fingerlings. The method used in this research was an experimental method using a completely randomized design (CRD), which consists of three treatments and four replicates The treatment was the use of aeration stone in a round container A (control), B (water current 0.1 m s-1 in a round container) and C (water current 0.1 m s-1 combined with a venturi in a round container). The fish size used in this research was 2-3 cm obtained from Gourami and Nilem Breeding Centre, Singaparna, West Java Province. Fish were kept in water gallons with a volume of 19 L. Each gallon contained 30 fish. The feeding rate was 5% from biomass. The feed was given three times daily. Every ten days the weight data were collected and used for adjusting the feeding rate. The water quality during the research (40 days) was observed every seven days while survival rate, absolute weight growth, daily growth rate, feed conversion ratio and feed efficiency were observed every ten days. Based on the results of the research, the best reuslt was treatment C (water current of 0.1 m s-1 combined with venturi in a round container) had the highest survival rate (SR) of 58%, absolute weight growth (3.5 g), daily growth rate (1.69%), feed conversion ratio (2.01) and feed efficiency (50%).

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The Effect of Potassium Diformate Addition to Feed on Growth and Survival Rates of Common Carp (Cyprinus carpio L.)

Asian Journal of Fisheries and Aquatic Research ◽

10.9734/ajfar/2020/v10i430186 ◽

2020 ◽

pp. 1-8

Author(s):

Ayi Yustiati ◽

Mahmud Sa’id ◽

. Junianto ◽

Ibnu Bangkit Bioshina Suryadi

Keyword(s):

Growth Rate ◽

Survival Rate ◽

Common Carp ◽

Survival Rates ◽

Stocking Density ◽

Good Effect ◽

Optimal Dosage ◽

Daily Growth Rate ◽

Daily Growth ◽

Growth And Survival

This research aimed to determine the optimal dosage of potassium diformate addition to commercial feed in order to increase the growth and survival rate of common carp seeds. The method used in this research was experimental in a completely randomized design (CRD) consisting of five treatments and four replications. The treatments used were A (control), B with addition of potassium diformate (0.2%), C (0.3%), D (0.4%), and E (0.5%). For test fish, there were 200 of Common carp seeds with a size of 2-3 cm. The media used was 20 aquariums with a size of 40x30x40 cm3 and a stocking density of 10 individuals/aquarium. The rearing period was 35 days and the amount of feed given was 3% of the fish body weight. The parameters observed included water quality (temperature, pH, and dissolved oxygen) which were observed every 7 days for 35 days. Other parameters monitored were daily growth rate, survival rate, feed efficiency, and the acidity level of the intestine. The results showed that 0.3% addition of potassium diformate gave the best results with a daily growth rate value of 3.21%, highest survival of 98%, efficiency of feed utilization of 64.83%, and a decrease in intestinal pH which helped the process of protein absorption in the fish body. In conclution, the addition of potassium diformate has good effect on growth and survival rates of common carp.

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SUPPLEMENTASI ROSELLA (Hibiscus sabdariffa LINN) DALAM PAKAN BUATAN TERHADAP KINERJA BENIH IKAN NILEM (Osteochilus hasselti)

Jurnal Mina Sains ◽

10.30997/jms.v5i1.1770 ◽

2019 ◽

Vol 5 (1) ◽

Author(s):

Mulyana Mulyana1 ◽

Rosmawati Rosmawati

Keyword(s):

Growth Rate ◽

Survival Rate ◽

Feed Efficiency ◽

Hibiscus Sabdariffa ◽

Daily Growth Rate ◽

Daily Growth ◽

Randomized Design ◽

Completely Randomized Design

The research is aimed to know the dose of Roselle in the feed that produce the best of the daily growth rate, survival rate and feed efficiency on Hard-Lipped Barb Fry. The research was using completely randomized design with 5 treatments and 3 replications. The treatments were differences in dose of Roselle in the feed (0, 10, 20, 30, and 40 g of Roselle/kg of feed). The results of the research showed that the treatment of 40 g of Roselle/kg of feed have been given significantly different effect (P <0,05) against the daily growth rate and feed efficiency, respectively 2,02% and 27,55%. Keywords: Hard-Lipped Barb, Roselle, growth.

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Short-term fluctuations in the live weight of identical twin cattle

Animal Science ◽

10.1017/s0003356100035972 ◽

1978 ◽

Vol 27 (2) ◽

pp. 141-146 ◽

Cited By ~ 1

Author(s):

C. S. Taylor ◽

R. G. Griffiths ◽

H. P. Donald

Keyword(s):

Growth Rate ◽

Body Weight ◽

Live Weight ◽

Identical Twins ◽

Identical Twin ◽

Short Term ◽

Daily Growth Rate ◽

Daily Growth

ABSTRACTTwo pairs of uniformly treated identical twins were weighed four times daily for 16 days. In addition, daily growth rate was analysed for 10 pairs of identical twins kept on high and low planes of nutrition over a 16-week period.Identical twins fluctuated in body weight from hour to hour and day to day in a significantly more similar manner than did unrelated animals. The greater similarity found when all animals were uniformly treated still persisted when identical twins were placed on different planes of nutrition.

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