Papers by Zelealem Tesfay
International Journal of Fisheries and Aquatic Studies, 2016
The aim of the present study was to estimate the chemical composition (crude protein, crude fat, ... more The aim of the present study was to estimate the chemical composition (crude protein, crude fat, ash, moisture and carbohydrate) and mineral contents (K, Ca, Na, Mg, P, Zn, Fe, Cu and Mn) in five fish species from the Tekeze reservoir and Lake Hashenge. Samples of fishes were collected from Tekeze reservoir and Lake Hashenge between December 2014 and March 2015 from the landing sites of the two water bodies. The samples were immediately and fish fillets were stored in refrigerator to determine the proximate and mineral contents of the fillet using the standard procedures of AOAC (2000). The result of the proximate composition analysis showed that the content of the crude protein of Cyprinus carpio, Clarias gariepinus, Bagrus docmak, Labeobarbus intermedius and Labeobarbus nedgia was 17.25%, 15.44%, 15.35%, 14.98% and 15.09% of the wet weight, respectively. The analyzed result showed that the content of moisture, Crude protein, crude fat and carbohydrate value of the different fish species were significantly different (P<0.05). The percentage of ash between the sampled fish species were not significantly different (P>0.05). The content of crude fat and ash were ranged from 1.26 to 5.74% and 0.83 to 0.94% of the wet weight, correspondingly. The crude fat content of the different fish species were significantly different (P<0.05) and C.gariepinus was showed the highest crude fat content (5.74±0.27%). The concentration of K was highest in muscle of C. carpio (17276.21±25.54 mg/kg). The highest concentrations of K, Ca, P, Mg and Mn were found in the C. carpio among the five species. Iron and Zinc value were highest in the C. gariepinus, whereas Copper was highest in muscle of the L. intermedius. The analyzed mineral content found in each fish species was in the order K>Na>Ca>Mg>P>Fe>Zn>Cu>Mn. The present study revealed that all fish species are good sources of proteins and fats, there is need to investigate in detail the types of amino acids and fatty acids of the sampled fishes.
International Journal of Fauna and Biological Studies, 2016
This study presents an assessment of fishing practices in Tekeze reservoir between December, 2014... more This study presents an assessment of fishing practices in Tekeze reservoir between December, 2014 and March, 2015. Data on fish production potential and catch per unit effort were estimated by using different estimate models and through daily catch respectively. Assessment of fishing practices was done by using questionnaires. A total of 1016 specimens composed of juveniles and adults in Tekeze reservoir were identified and classified. They comprised of ten species belonging to three order and four families from Tekeze reservoir. In combined catch, the relative abundance of O. niloticus was 51.38% from Cichildae family, 24.11% Labeobarbus intermidius from cypriformes family and the least dominant in the catch composition was Hetrobarnchus longifilis from siluriformes family. The catch per unit effort (CPUE) for Tekeze reservoir was 8.27 kg/boat/day. In Tekeze reservoir there were 2291 legal fishermen from four districts of Amhara region and one district from Tigray region, 608 boats and two different types of fishing gears were identified. Gillnet was the most operated gear in the Tekeze reservoir followed by long lines. The fishing effort, CPUE and yields did not show any indication on the overexploitation of the resources. The dominant fish species by catch in Tekeze reservoir was O. niloticus. To avoid overexploitation of O. niloticus species in Tekeze reservoir, there is need to diversify fish catch by creating awareness among people for the exploitation and use of other fish species like Labeobarbus spp. The remoteness of the reservoir and luck of infrastructure affects the price of the fish. In addition to this the fish price was varied in species and fasting and no fasting seasons of the year.
Tropical Animal Health and Production, Nov 14, 2013
A study was conducted in Tigrai, Northern Ethiopia to describe the sheep breeds and their product... more A study was conducted in Tigrai, Northern Ethiopia to describe the sheep breeds and their production system. The survey was done in selected districts known for their high sheep population density. The phenotype characterization identified distinct features for each breed. The breeds are Aberegelle, Ille, Begait, and the common Tigrai highland sheep. The strong discriminating phenotypes are face profile, tail type, and compactness; accounting for 83.48, 17.95, and 2.93% respectively of the total variability among breeds. The flock structure are affected by the market demand; requirements of breeding females and feed availability. Farmers tend to keep more female sheep for longer (culling age of 5.9 ± 0.4 and 1.9 ± 0.5 for females and males, respectively) for the reasons of feed shortage and need to maximize number of breeding female. The ratio of male to overall female is large (1:6) and thus a single ram gets maximum contact time with ewes and ewe lambs. The overall average age at puberty for females is 9-14 months. However, the presence of very young lamb rams and uncontrolled mating system lead to early breeding of females which results in low conception rate, low birth weight, poor survival rates, and in extreme cases causing inbreeding. It was also possible to identify the critical control points such as breed, age of animals, nutrition, and feeding systems affecting the provision of live animals for good meat quality.
Livestock research for rural development, 2013
Journal of Agricultural Biotechnology and Sustainable Development, 2018
Demonstration of Koekoek breed was conducted at Raya-Azebo and Enda-Mehoni Woredas with 10 poor h... more Demonstration of Koekoek breed was conducted at Raya-Azebo and Enda-Mehoni Woredas with 10 poor households with the objective of increasing the productivity of poultry thereby improving livelihood of the resource poor farmers in Ethiopia. Koekoek breed had significantly (P<0.05) superior on number of eggs laid per clutch (26 egg/clutch) as compared to local breed (15 egg/clutch). Beside this, the Koekoek breed is also superior in both sexes (male 2.6 kg and female 1.9 kg) on yearly body weights as compared to local breed. Koekoeks breed had significant (P<0.05) mean scored of 6 over local breed on production and reproduction performance. The farmers perceived that Koekoek breed had superior traits on body weight, number of eggs laid per month, egg size, vent size and marketability weight of egg. However, local breed was as superior as Koekoek breed on tail height, body color, leg length and color. The breed is now playing a great role as source of cash income to the beneficiary households and covers various expenses such as educational expense, saving, routine daily life expense, house equipments, electronic device sheep and feeds. Also, the breed is being disseminated to large number of farmers through the farmer to farmer dissemination approach. Beneficiary farmers are selling eggs to their neighbors and the male Koekoeks are playing roles as community based breed improvement. Hence, efforts should be made by the extension and other actors to further scale out the breeds.
Journal of Agriculture and Ecology Research International, 2019
The study was conducted at Humera agricultural research centre farm, northern Ethiopia aimed to e... more The study was conducted at Humera agricultural research centre farm, northern Ethiopia aimed to evaluate the effects of supplementation of cowpea (Vigna unguiculata) hay (CPH), wheat bran (WB) and their mixtures on feed intake, average daily gain (ADG) and carcass characteristics of Begait lambs fed grass hay (GH) as a basal diet. The experimental lambs were divided into five groups based on initial body weight and randomly assigned to the five treatments. Treatments were ad libitum feeding of GH and supplemented with 300 g CPH, 225 g CPH + 75 g WB, 150 g CPH + 150 g WB, 75 g CPH + 225 g WB and 300 g WB DM/day for T1, T2, T3, T4 and T5, respectively. Total DM intake was 687.1, 669.4, 719.4, 631.0 and 673.47 gd-1 for T1, T2, T3, T4 and T5, respectively and significantly higher (p<0.001) and lower (p< 0.001) for T3 and T4, respectively and intermediate for others. The ADG was 36.4, 43.6, 52.9, 43.1 and 42.4 gd-1 for lambs in T1, T2, T3, T4 and T5, respectively was higher (p&l...
African Journal of Agricultural Research, 2017
Ethiopia has endowed sheep breed with poor productivity in terms of meat yield. Therefore demonst... more Ethiopia has endowed sheep breed with poor productivity in terms of meat yield. Therefore demonstration of Dorper breed sheep was conducted at Enda-Mekoni Woreda with the objective of improving production and productivity of local sheep. Two pure male Dorper sheep were introduced to Enda-Mehoni Woreda for community based breeding strategies. Data such as live Body weight and farmer perception were collected. Data was analyzed using descriptive statistics and Ranking methods. At the beginning, community had negative perception and not willing to cross their sheep with Dorper sheep. However, Farmers were given higher scored (49) to pure Dorper sheep on selection criteria for, male breeding stock. As a result, it's off spring (50% local and Dorper) was scored higher (97) on productivity and reproductive performance. In the present study, body weight of male crossed sheep was recorded 40 kg which is 18.7 kg higher body weight gaining as compared to local sheep with similar age. Moreover, crossed ewe had 8.5 kg superior on body weight gain compared to similar age of local sheep. Farmers notified that, pure Dorper and its crossed sheep had superior traits on loin, sternum, shoulder, body conformation, puberty age and marketable weight. The popularized Dorper sheep and its crossed had increased body weight growth as well as reproductive performance while crossed with local sheep. Therefore, it can be conclude that Droper sheep is adaptable to highland Tigray region as well as preferable to upgrade local sheep productivity.
Tropical Animal Health and Production, 2013
A study was conducted in Tigrai, Northern Ethiopia to describe the sheep breeds and their product... more A study was conducted in Tigrai, Northern Ethiopia to describe the sheep breeds and their production system. The survey was done in selected districts known for their high sheep population density. The phenotype characterization identified distinct features for each breed. The breeds are Aberegelle, Ille, Begait, and the common Tigrai highland sheep. The strong discriminating phenotypes are face profile, tail type, and compactness; accounting for 83.48, 17.95, and 2.93% respectively of the total variability among breeds. The flock structure are affected by the market demand; requirements of breeding females and feed availability. Farmers tend to keep more female sheep for longer (culling age of 5.9 ± 0.4 and 1.9 ± 0.5 for females and males, respectively) for the reasons of feed shortage and need to maximize number of breeding female. The ratio of male to overall female is large (1:6) and thus a single ram gets maximum contact time with ewes and ewe lambs. The overall average age at puberty for females is 9-14 months. However, the presence of very young lamb rams and uncontrolled mating system lead to early breeding of females which results in low conception rate, low birth weight, poor survival rates, and in extreme cases causing inbreeding. It was also possible to identify the critical control points such as breed, age of animals, nutrition, and feeding systems affecting the provision of live animals for good meat quality.
African Journal of Food Science, 2012
The inadequacy of food supply due to the population growth together with urbanization, drive a si... more The inadequacy of food supply due to the population growth together with urbanization, drive a significant demand for animal sources. Consequently, a number of technologies have been developed and are being used commercially to enhance profitability of animal production and to improve their quality. The objective of this paper is to review recent studies on the effects of metabolic modifiers on quantity and quality of meat and their contribution in sustaining food security and improving quality of life. Metabolic modifiers such as β-agonists, anabolic implants, somatotropin, immunocastration, vitamin E, conjugated linoleic acid (CLA) and trace elements have been utilized by different agribusiness to improve meat production and enhance meat quality. These compounds supplement to the animals with feed, as an injection or implant to enhance the rate of gain, the feed utilization efficiency, carcass percentage, shelf-life of meat, improve meat's nutrient content and/or meat palatability. On the other hand, some metabolic modifiers are either not approved or banned from use due to negative health effects to the consumer. There is a consistent research report for the approved technologies enhancing protein synthesis and muscle deposition, while decreasing fat synthesis and deposition, when they are applied in the recommended dosage. Therefore, we believe that utilizing available technologies and methodologies in reference to the mentioned materials will help in improving meat quality and thereby increase productivity of the livestock resource and hence, improve food security.
The inadequacy of food supply due to the population growth together with urbanization, drive a si... more The inadequacy of food supply due to the population growth together with urbanization, drive a significant demand for animal sources. Consequently, a number of technologies have been developed and are being used commercially to enhance profitability of animal production and to improve their quality. The objective of this paper is to review recent studies on the effects of metabolic modifiers on quantity and quality of meat and their contribution in sustaining food security and improving quality of life. Metabolic modifiers such as β-agonists, anabolic implants, somatotropin, immunocastration, vitamin E, conjugated linoleic acid (CLA) and trace elements have been utilized by different agribusiness to improve meat production and enhance meat quality. These compounds supplement to the animals with feed, as an injection or implant to enhance the rate of gain, the feed utilization efficiency, carcass percentage, shelf-life of meat, improve meat's nutrient content and/or meat palatability. On the other hand, some metabolic modifiers are either not approved or banned from use due to negative health effects to the consumer. There is a consistent research report for the approved technologies enhancing protein synthesis and muscle deposition, while decreasing fat synthesis and deposition, when they are applied in the recommended dosage. Therefore, we believe that utilizing available technologies and methodologies in reference to the mentioned materials will help in improving meat quality and thereby increase productivity of the livestock resource and hence, improve food security.
The Exploitation of Plant Resources in Ancient Africa, 1999
... Debela, S.(1989). Brief remarks on grass pea production in Ethiopia. In (PS Spencer, ed.) The... more ... Debela, S.(1989). Brief remarks on grass pea production in Ethiopia. In (PS Spencer, ed.) The Grass Pea: Threat and Promise. New York: Third World Medical Research Foundation, pp. 147-151. Elizabeth Wuhib, Redda Tekle-Haimanot, Angelina Kassina, Yemane Kidane and ...
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Papers by Zelealem Tesfay