The comparative productivity of five ewe breeds. 1. Lamb growth and survival

An experiment was conducted at Temora Agricultural Research Station to compare birth weights, growth rates to weaning, and survival of lambs from five breeds. These data formed part of a larger study comparing the productivity of these breeds as possible dual-purpose ewe breeds. The breeds were a Border Leicester X Merino fixed halfbred (BLM), Corriedale, Polwarth, and a South Australian strong wool (S.A. Merino) and a medium wool Peppin strain of Merino. The descending order of ranking of the breeds on birth weight and growth rate to weaning was BLM, Corriedale, S.A. Merino, Polwarth and Peppin Merino. A significant breed x year interaction in pre-weaning growth rate was recorded, since the absolute differences between breeds increased as the overall mean growth rate increased. Breed means for the survival rate of single-born lambs ranged from 80.7 to 86.4 lambs weaned per 100 lambs born and they were not significantly different from each other. The mean survival rate of multipleborn lambs from the S.A. Merino and Polwarth breeds were 65.0 and 69.5 respectively, and these were significantly lower than the survival rate of multiples from the other breeds (76.8 to 80.4). Within breeds, birth weight was found to be positively related to survival at low birth weights but negatively related to survival at high body weights

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The performance of pregnant and lactating Merino ewes and their lambs fed survival rations of wheat grain and sawdust

Australian Journal of Experimental Agriculture ◽

10.1071/ea9780034 ◽

1978 ◽

Vol 18 (90) ◽

pp. 34 ◽

Cited By ~ 2

Author(s):

RA Hunter

Keyword(s):

Growth Rate ◽

Birth Weight ◽

Survival Rate ◽

Wheat Grain ◽

Term Survival ◽

Feeding Level ◽

Wool Growth ◽

Eucalyptus Maculata ◽

Maintenance Ration

Merino ewes were mated at pasture and then fed in pens either a maintenance or an 80 per cent maintenance ration of wheat grain three times a week. Half the animals at each feeding level were offered Spotted Gum (Eucalyptus maculata) sawdust. Addition of sawdust to the ration did not affect liveweight change and the wool growth rate of ewes or the birth weight and growth rate of lambs. It did, however, affect the long-term survival rate of ewes. Of the ewes that died after three months of survival feeding, four were in groups fed wheat alone and one in a group fed sawdust with the wheat. The survival rate and growth rate of lambs in all treatments were poor.

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WATER QUALITY AND ITS EFFECT ON GROWTH AND SURVIVAL RATE OF LOBSTER REARED IN FLOATING NET CAGE IN EKAS BAY, WEST NUSA TENGGARA PROVINCE

Jurnal Ilmu dan Teknologi Kelautan Tropis ◽

10.29244/jitkt.v6i2.9011 ◽

2015 ◽

Vol 6 (2) ◽

Author(s):

Muhammad Junaidi ◽

Mat Sardi Hamzah

Keyword(s):

Water Quality ◽

Growth Rate ◽

Survival Rate ◽

Quality Data ◽

Dominant Factor ◽

Growth And Survival ◽

Water Quality Status ◽

Net Cage ◽

Quality Status ◽

Effect On Growth

ABSTRACT The development of lobster farming in floating net cage in Ekas Bay caused an environmental degradation such as decrease water quality due to some aquaculture wastes. The purposes of this study were to determine the status of water quality and their effect on growth and survival rate of lobster reared in floating net cages (FNC) in the Ekas Bay, West Nusa Tenggara Province. Water sample collection and handling referred to the APHA (1992). Analyses of water quality data were conducted using Principal Component Analysis. Determination of the water quality status of Ekas Bay was performed with STORET system. Multivariate analyses were used to determine the relationship between water quality, growth, and survival rate of lobster reared in FNC. Results showed that Ekas Bay water quality status was categorized in class C (medium contaminated), which exceeded some quality standard parameters such as ammonia (0.3 mg/l), nitrate (0.008 mg/l), and phosphate (0.015 mg/l). During lobster farming activities feeding with trash fish for 270 days, we obtained daily growth rate of 0.74% (lower than normal growth rate of 0.86%), survival rate of 66% (lower than normal survival rate of 86.7%), and feed conversion ratio of 11.15. Ammonia was found as a dominant factor reducing growth and survival rate of lobster reared in FNC. Keywords: water quality, lobsters, growth, survival, Ekas Bay

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Comparison of the Growth Potential of Macrobrachium rosenbergii in Mono and Polyculture Conditions in Earthen Culture Ponds of Jammu, India

Journal of Ecophysiology and Occupational Health ◽

10.18311/jeoh/2019/23499 ◽

2019 ◽

Vol 19 (3&4) ◽

pp. 112

Author(s):

Sanjeev Kumar Karlopia ◽

Yahya Bakhtiyar ◽

Seema Langer

Keyword(s):

Growth Rate ◽

Survival Rate ◽

Macrobrachium Rosenbergii ◽

Growth Potential ◽

Growth And Survival ◽

Indian Major Carps ◽

Freshwater Ponds ◽

Mean Size ◽

Average Size ◽

Major Carps

The study was conducted to assess the growth and survival of Macrobrachium rosenbergii in earthen culture ponds in order to know about the growth potential of M. rosenbergii in mono as well as polyculture conditions in Jammu. Polyculture experiments of prawn with some selected carps Indian Major Carps (Cirrhinus mrigala and Labeo rohita) and Exotic Carps (Cyprinus carpio) were undertaken in 3 freshwater ponds for duration of 4 months. Under the monoculture conditions, prawns attained an average size of 10.40 ± 0.17 cm weighing 23.84 ± 0.32 g in 4 months and the survival rate was found to be more than 75%. The growth rate of prawns was found to increase steadily during the first half (upto mid-October) after which a decline in the growth rate was evident as the mean temperature reached below 18°C. In the polyculture ponds the prawns attained an average size of 10.10 ± 0.03 cm weighing 18.39 ± 0.89g (without C. carpio) and 8.4 ± 0.36 cm weighing 15.23 ± 0.36 g (with C. carpio) in 4 months and their survival rate was less than 70%. Prawns being benthic feeders utilized the leftover food (of the fishes) that settled at the bottom, therefore, saving the feed cost. It was observed that mean size of the fish attained in the polyculture practice was almost similar to that obtained in the monoculture. The ideal prawn polyculture should be practiced with fast growing compatible carps such as Rohu and grass carp. Bottom feeder carps such as Mrigal (C. mrigala) should be avoided in prawn polyculture practice as they compete with prawns in feeding.

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PENGARUH TEPUNG TELUR AYAM AFKIR PADA PAKAN BUATAN YANG BERPROBIOTIK TERHADAP EFISIENSI PEMANFAATAN PAKAN, PERTUMBUHAN DAN KELULUSHIDUPAN LELE DUMBO (Clarias gariepinus). (The Effect Of Chicken Eggs Rejects Powder In Artificial Feed With Added Probiotic On Efficiency Feed Utilization, Growth And Survival Rate Of Dumbo Catfish (Clarias Gariepinus))

SAINTEK PERIKANAN Indonesian Journal of Fisheries Science and Technology ◽

10.14710/ijfst.13.2.111-118 ◽

2018 ◽

Vol 13 (2) ◽

pp. 111

Author(s):

Suminto Suminto ◽

Titik Susilowati ◽

Bambang Argo Wibowo ◽

Diana Chilmawati

Keyword(s):

Growth Rate ◽

Survival Rate ◽

Protein Efficiency Ratio ◽

Clarias Gariepinus ◽

Feed Utilization ◽

Efficiency Ratio ◽

Relative Growth ◽

Growth And Survival ◽

Chicken Egg ◽

Egg Powder

Pengembangan budidaya ikan lele, Clarias gariepinus sering terjadi kendala dengan biaya pakan yang terlalu tinggi (60-70% dari biaya produksi). Barangkali, penggunaan bahan baku lokal seperti pemanfaatan tepung telur ayam yang nilai nutrisinya tinggi, mudah didapat, dan murah harganya merupakan salah satu solusinya. Tujuan penelitian ini adalah untuk mengkaji dan mengetahui pengaruh penambahan tepung telur ayam afkir dalam pakan buatan yang berprobiotik terhadap efisiensi pemanfaatan pakan, pertumbuhan dan kelulushidupan ikan lele dumbo (C. gariepinus). Penelitian ini menggunakan metode eksperimental dengan rancangan acak lengkap (RAL) yang menggunakan 4 perlakuan dan masing-masing 3 kali kali ulangan. Perlakuan itu adalah pakan yang tanpa menggunakan tepung telur ayam afkir (Perlakuan A), pakan yang menggunakan tepung telur afkir masing-masing sebanyak 15%, 30%, dan 45% sebagai Perlakuan B, C, dan D. Ikan uji bibit lele dumbo (C. gariepinus) yang ditebar mempunyai bobot rerata 2.04±0.05 g dengan kepadatan 1 ekor/L yang dipelihara selama 42 hari. Variabel data yang diukur meliputi Tingkat Konsumsi Pakan (TKP), Efisiensi Pemanfaatan Pakan (EPP), Feed Convertion Ratio (FCR), Protein Efficiency Ratio (PER), Relative Growth Rate (RGR), dan Survival Rate (SR). Hasil penelitian ditunjukkan bahwa penggunaan tepung telur ayam afkir pada pakan buatan memberikan pengaruh yang nyata (p < 0.05) terhadap TKP, EPP, FCR, PER, dan RGR, tetapi tidak berpengaruh nyata (P≥0,05) terhadap SR. Perlakuan dengan penambahan tepung telur ayam afkir sebanyak 30% (Perlakuan C) memberikan nilai terbaik untuik TKP sebesar 146,87%, EPP sebesar 88,77%, PER sebesar 2,61% dan RGR sebesar 7,65%/hari dari perlakuan lainnya. Monitoring nilai kualitas air pada media pemeliharaan telah menunjukkan bahwa pada kisaran yang layak untuk pemeliharaan ikan uji. Catfish cultivation development, Clarias gariepinus often occur constraints with the high cost of feed (60-70% of the production cost). Perhaps, the use of local raw materials such as the utilization of rejected chicken egg with high nutritional value, easy to obtain, and cheap price is one of the solution. The purpose of this research was to know the effect of addition of rejected chicken egg powder inprobiotized artificial feed on the efficiency of feed utilization, growth and survival rate of catfish, C. gariepinus. This study was used an experimental method with completely randomized design (RAL) by using 4 treatments and each of them 3 replications. The treatments were feed without use of rejected chicken egg powder (Treatment A), feed using 15%, 30%, and 45% of powder meals of rejected chicken egg as treatment B, C, and D, respectively. Catfish, C. gariepinus seeds were stocked with a mean weight of 2.04 ± 0.05 g with a density of 1 tail / L and cultured for 42 days. The data variables measured were Total of Feed Consumption (TFC), Feed Utilization Efficiency (FUE), Feed Conversion Ratio (FCR), Protein Efficiency Ratio (PER), Relative Growth Rate (RGR), and Survival Rate (SR). The results showed that the use of chicken egg starch in artificial feed gave a real effect (p <0.05) on TFC, FUE, FCR, PER, and RGR, but no significant effect (P≥0,05) on SR. Treatment with the addition of 30% chicken meal (Treatment C) had the best value for TFC at 146.87%, the FUE of 88.77%, the PER of 2.61% and the RGR of 7.65% / day than of the another treatments. Monitoring of water quality values on maintenance media has shown that at a reasonable range for the maintenance of catfish culture.

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The performance of Masham ewes

Animal Science ◽

10.1017/s0003356100012162 ◽

1979 ◽

Vol 29 (1) ◽

pp. 69-79 ◽

Cited By ~ 5

Author(s):

J. E. Newton ◽

J. S. Fenlon

Keyword(s):

Growth Rate ◽

Birth Weight ◽

Perinatal Mortality ◽

Litter Size ◽

High Birth Weight ◽

Litter Weight ◽

Lamb Growth

ABSTRACTThe performance of two flocks of crossbred Masham ewes (Tees-water × Dales Bred) was measured for 6 and 4 years respectively. The ewes in Flock 1 were mated with Dorset Down rams and the ewes in Flock 2 with Suffolk rams.The overall mean mating weight of each flock was 68-0 kg with no consistent year-to-year variation. The mating weight repeatability values for ewes entering the flocks as 2-year-olds were 0·532 (±0·0681) and 0·524 (±0·1118) for Flocks 1 and 2 respectively.Mean litter size increased with age, but repeatability was low. Over- all litter weights for singles, twins and triplets were 5·89, 9·88 and 12·43 kg respectively. Two-year-old ewes had lighter litters than mature ewes. Repeatability for litter weight in Flock 1 was 0·337 (±0·0755).Lamb growth rate to 4 weeks of age was lower for 2-year-old ewes in both flocks and the repeatability was 0·322 (±0·0947) in Flock 1. For ewes having twin lambs, significant correlations (P < 0·01) were found between mating weight and birth weight and between birth weight and lamb growth rate to 4 weeks of age.Perinatal mortality was higher for lambs with a birth weight below 3·9 kg, but overall lamb mortality was only 8%: this low figure was probably due to the relatively high birth weight of the twin and triplet lambs.

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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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A preliminary report on the production characters of three types of cattle in Ghana.

Netherlands Journal of Agricultural Science ◽

10.18174/njas.v11i5.17536 ◽

1963 ◽

Vol 11 (5) ◽

pp. 364-377

Author(s):

G. Montsma

Keyword(s):

Growth Rate ◽

Body Weight ◽

Agricultural Research ◽

West African ◽

Research Station ◽

Insufficient Data ◽

The West ◽

Weight Growth ◽

Before And After ◽

The University

At the University of Ghana's Agricultural Research Station at Nungua observations were begun in 1957 on the performance of West African Shorthorn, N'Dama and Sokoto Gudali cattle. The main preliminary findings are discussed under the following headings: body weight, growth rate, milk yield, reproductive efficiency, and dentition and age. In spite of the fact that the N'Dama and West African Shorthorn are naturally small animals, body weight and growth rate could be substantially increased by better feeding. Insufficient data are as yet available on the Sokoto. Under the better-than-average feeding conditions at the station, av. body weight at 8 mths. was 305 lb. in the N'Dama, 340 lb. in the West African Shorthorn, and 470 lb. in the Sokoto. Maximum body weight at 8 mths. was 340, 360 and 550 lb. resp. In animals fed a concentrate supplement, av. 252-day milk yields per 100 lb. body weight were 295, 300 and 335 lb. for the N'Dama, West African Shorthorn and Sokoto resp. max. yields, expressed in a similar manner, being 416, 430 and 458 lb. resp. Milk yields were estimated by weighing the calves before and after suckling thrice daily for approx. 20 mins The av. calving percentages for the 3 breeds were 85, 83 and 76 resp. which are equivalent to calving intervals of 14-2, 14.5 and 15.8 mths. The av. age at 1st calving in the West African Shorthorn was estimated to be 3 yrs. (2.3-3.8). Insufficient data were available on the other 2 breeds. It is considered that, if adequately fed, heifers are capable of calving at 27-30 mths. of age. (Abstract retrieved from CAB Abstracts by CABI’s permission)

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Effects of ewe live weight and age on reproductive performance, lamb growth, and survival in Central Anatolian Merino sheep

Archives Animal Breeding ◽

10.5194/aab-58-451-2015 ◽

2015 ◽

Vol 58 (2) ◽

pp. 451-459 ◽

Cited By ~ 10

Author(s):

A. H. Aktaş ◽

Ş. Dursun ◽

Ş. Doğan ◽

Z. Kiyma ◽

U. Demirci ◽

...

Keyword(s):

Growth Rate ◽

Reproductive Performance ◽

Birth Rate ◽

Live Weight ◽

Fertility Rate ◽

Multiple Birth ◽

Growth And Survival ◽

Merino Sheep ◽

Lamb Growth ◽

Selection Of

Abstract. The aim of this study was to evaluate the effects of premating ewe weight and age on ewe reproductive performance, lamb growth and survival in Central Anatolian Merino (CAM) sheep. The trial included 4935 ewes and 5548 lambs from 23 breeder flocks in Eskişehir Province. The live weights (LWs) and ages of the ewes were recorded 1 week before the mating season. The number of lambs born, fertility rate, multiple birth rate (MBR), and lamb survival rate (SR) at days 75 and 120 were determined. The effects of the LW and age of the ewe were found to be important for the reproductive performance of ewes and for the lamb's growth rate (P < 0.05–0.001). Ewe MBRs and the birth weight (BW) and LW of the lambs at days 75 and 120 increased proportionally with the increase in LW in ewes prior to mating. The fertility rate and MBR were lower (P < 0.05–0.001) in 1.5-year-old ewes than in older ewes. However, lambs' SR at days 75 and 120 were not affected by the premating LW and age of the ewe. In summary, a better reproductive performance and lamb growth rate in CAM flocks may be achieved by the selection of breeding ewes from ewes weighing more than 60 kg.

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