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Articles by Ahmet Sahin
Total Records ( 11 ) for Ahmet Sahin
  Ibrahim Yildirim and Ahmet Sahin
  The comparison of the profitability of culture and native-breed dairy farms was aimed in this study. The hypothesis that culture-breed dairy farms are more profitable as well as more cost-efficient in producing one unit of milk and that the profitability increases in proportion to farm size was tested. The material was collected from 40 culture and 16 native-breed dairy farms in Center town of Van province, Turkey. The data belong to 1999 production period. The number of cow per farm, daily milk per cow, lactation period, milk production per cow per lactation and total milk production per farm was 8.3, 7.63 kg, 225.5 days, 1720.6 and 14.289.7 kg, respectively for culture-breed dairy farms. The same figures were relatively lower for native-breed dairy farms with 4.4, 3.24 kg, 208.13 days, 674.3 and 2.967 kg, respectively. Economical profitability was positive with 3.27% for culture-breed farms while this figure was negative for native-breed farms with -1.14%. Both economical and financial profitability increased in parallel to farm size. The cost of 1 kg of milk was calculated as $ 0.47, which is 60% higher than that of culture-breed dairy farms. This figure decreased in proportion to farm size. The total production elasticity of inputs found by coob-douglas production function for culture-breed dairy farms was 2.97, which means there is an increasing return to the scale. We can suggest that the scale is effective on the profitability and expanding the culture-breed dairy enterprise could increase the profitability due to economies of scale.
  Mikail Baylan , Sibel Canogullari , Tugay Ayasan and Ahmet Sahin
  The present study was conducted to evaluate the effects of dietary threonine amino acid supplementation on growth performance and carcass characteristics of Japanese quails. Day old, two hundred and seventy quail chicks were divided into six dietary treatment groups comprising 45 birds each, which consisted of 3 subgroups containing 15 birds for each replicate. Experimental diets were prepared and contained 0.81, 0.86, 0.91, 0.96, 1.01 and 1.06 % threonine amino acid, respective to groups 1-6, on fresh matter basis. Birds were fed these experimental diets respective to treatment for 35 days. Total feed intakes and the changes in body weights were determined on weekly basis. At the end of experiment 35-d, birds were killed humanly to determine their edible carcass parts. Results showed that threonine supplementation to the diet did not affect growth performance and edible carcass parts (p>0.05), assuming that birds can make metabolic adaptation to current dietary threonine supplementations.
  Mahmut Keskin , Osman Bizer , Sabri Gul and Ahmet Sahin
  This study was carried out to investigate the effect of artificial lighting (Al) on fattening performance and feeding behaviour of Shami (Demanascus) young male goats in comparison to naturally lightened male young goats. Sixtgeen young male goats fed a diet containing 2500 Kcal metabolic energy (ME) and 160 g crude protein (CP) kg-1 (on fresh matter basis) were randomly (8 goats per group) distributed into two groups (control, AL). Al animal sere subjected to the additional lighting regime during dark period of day (from 19:00 to 07:00) with 2 lamps having 100 watt capacity. Goats were weighed with 14-d time interval for 70 days without any food and water deprivationj to monitor their live weight gain. Behavioural observations (eating, ruminating, resting and others-defecation, urinating, drinking, walking, standing, play, etc.) were recorded once a week on Tuesdays at 19:00, 21:00, 23:00, 05:00 and 07:00. Daily food intake, daily gain and feed conversion ratio (g gain: g feed) were 1646 g vs 1694 g; 200 g vs 207 g and 8.65 vs 9.25 in control and Al groups (P>0.05). Also, behavioural observation data showed that control animals activated more for resting (49.3%, vs 41.1%) than Al animals (P>0.05), but this was not statistically significant. However, Al goats eating behaviour was higher than control animals (28.2% vs 19.5%) (P<0.05). In conclusion, the artificial lighting in goats has no impact on fattening parameters. This could be related to their digestive anatomical and physiological characteristics.
  Erdal Yilmaz , Ahmet Sahin , Ihsan Akyurt and Metin Duru
  In this study, the effects of five different energetic diets (10.85, 11.82, 12.73, 13.69, and 15.06 MJ DE kg-1 in order) with same protein content (350 g CP per kg diet) on growth and behaviours of the African catfish, Clarias gariepinus, were investigated. Diets were offered to fishes two times a day as two meals one was at 09:00 and the another one was at 17:00 for 90 days. Behavioural observations were recorded twice a week for a period of 1 h during four successive observations (at between 08:00-09:00, 10:00-11:00, 16:00-17:00, and 18:00-19:00 h) at 10 minutes intervals. Fish consuming the lowest (10.85 MJ DE kg-1) and intermediate energy (12.73 MJ DE kg-1) showed the similar weight gain, but the intermediate energy group provided the best feed and protein efficiency, when compared to others (P<0.05). The dietary energy level affected swimming, resting, grouping and foraging behaviours of African catfish fingerlings during the experimental period (P<0.01) without affecting attention to the servicer. To conclude; when energy content of the diet increased, the feed intake was affected negatively with consequent reduction in growth performance of African catfish, Clarias gariepinus.
  Ahmet Sahin , Mahmut Keskin and Osman Bicer
  The present study was designed to investigate whether there was any effect of Trigonella feonum graceum L. (TFG) on appetite and growth of Awassi lambs or not. Thirtysix, 3-month-old male lambs were used for 84-d. The main effect was the doses of TFG inclusions (0, 2, 4 and 8 %) in lamb diet. Each treatment consisted of 9 lambs as a group. Lamb diet having 2467 Kcal ME and 161g kg-1 made from barley, cotton seed meal, wheat bran and alfalfa straw. TFG inclusions (0, 2,4 and 8 %) did not affect either daily food intake (1423.6, 1518.9, 1615.6 and 1586.9 g, respectively) or daily live weight gain (238.0, 245.1, 221.3 and 233.7 g, respectively) (P>0.05). The results showed that Trigonella feonum graceum L. did not affect the appetite and growth of Awassi lambs.
  Sibel Cano ullari , Mikail Baylan and Ahmet Sahin
  The effect of choice feeding on feed intake, diet selection, growth performance and some carcass characteristics in Japanese quails was investigated in the current study. Choice-fed quail chicks were offered a choice of a concentrate feed (CON, 300 g CP and 13.1 MJ ME kg-1) and grounded wheat (GW, 115 g CP and 12.8 MJ ME kg-1), while control quail chicks (single- fed) were fed on a commercial feed (230 g CP and 13.4 MJ ME kg -1). Choice feeding did not affect feed intake, daily gain, feed conversation ratio, final live weight and carcass weight (P>0.05). These were determined in control and choice-fed quails as 24.9 vs 24.4 g , 7.58 vs 7.32 g, 3.29 vs 3.33, 282.8 vs 274.4 g, 203.7 vs 202.3 g, respectively. Choice-fed quails made a diet containing 255 g CP and 13.1 MJ, which had higher protein content, but lower metabolic energy content than control diet 230 g CP and 13.39 MJ per kg (P<0.01), by selecting 74 % concentrate feed and 24 % grounded wheat when they were offered concentrate feed and grounded wheat simultaneously. Also, it was determined that the nutrient requirement of Japanese quails were higher than what given in NRC (1994) for protein (240 g CP kg-1) and energy requirement (12.1 MJ ME kg-1). To conclude, choice feeding did not affect the performance parameters of Japanese quails, but gave them the opportunity to balance their nutrient intakes.
  Mikail Baylan , Sibel Canogullari , Ahmet Sahin , Gulsen Copur and Makbule Baylan
  The aim of this study was to investigate the effects on some genetic parameters of different selection methods for Body Weight (BW) in Japanese quail. For this aim, line M55 was subjected to individual selection for 5 weeks BW while a reciprocal recurrent selection method was applied to lines R33 and S55. Selection lasted 2 generations. In individual lines, the percentage deviation of body weight was an average of 1.41, 1.73 and 2.19% in the 1st generation males, females and mixed sex, respectively. These parameters reached 5.57, 7.44 and 6.29% in the 2nd generation. In the reciprocal recurrent selection, heterosis of BW in the crossbred birds occurred in the positive direction and was 3.22 and 1.95% for R3S5 and S5R3, respectively in the 1st generation. In the 2nd generation, heterosis was calculated as 6.50 and 7.31% in R3S5 and S5R3, respectively, higher than the 1st generation. At the end of the 2 generations, R3S5 had higher heterosis than S5R3. BW increase was similar in the 2 selection methods. Heritability of BW in the individual lines was 0.27 and 0.73 in the 1st and 2nd generation, respectively. In the reciprocal selection, heritability of BW was estimated as 0.37 and 0.19 in the 1st generation and 0.17 and 0.27 in the 2nd generation for R3S5 and S5R3, respectively. As a result, at the end of the 2 generations of selection, an improvement in BW increase was obtained in both selection methods. If selection is continued in these lines, this may be important especially with regards BW.
  Ibrahim Tapki , Serafettin Kaya , Ahmet Sahin and Suat Sahinler
  This study was aimed to compare fattening performance, slaughter characteristics of Simmental (n=20) and Black & White (n=20) young bulls under subtropical climate conditions. Animals in both breeds in (5 equal groups for each breed) were fed on a diet containing 162 g CP and 10.7 MJ ME kg-1, based on body weight criterion for 120 days. With respect to total live weight gain and daily live weight gain, Simmental young bulls were higher than Black & White young bulls (168.1 kg vs. 141.8 kg and 1.401 vs. 1.181 kg). Besides, the feed conversion ratio data show that Simmental young bulls converted feed to body mass more efficiently than that of Black & White young bulls (6.49 vs. 7.44, kg feed : kg gain). Slaughter weight and hot carcass dressing percentage in Simmental and Black & White young bulls were found out as 445.4 kg vs. 416.3 kg and 57.15 % vs. 56.04 %, respectively. These results showed that Simmental breed was more preferable than Black & White breed under subtropical climate condition with respect to fattening performance and slaughter characteristics for beef production.
  Ahmet Sahin , Bulent Miran , Ibrahim Yildirim and Alper Onenc
  The major purpose of this study was to determine the cattle fattening breed, which maximizes the net profit for the producers under risks and uncertainties based on different characteristics of producers. The monthly data of 21 bullocks consisted of 7 Holstein, 7 PiedmonxHolstain and 7 LimuzinxHolstein cross-breed cattle fattened in closed tie-stall experiment barns of Aegean Agricultural Research Institute, Izmir, Turkey were used in the study. The games were constructed based on the net profit per cattle obtained in the 5th month of fattening where the highest total profit was obtained. Maximaks, Wald, Regret, Hurwicz, Utility and Laplace Criterions of Game Theory were used. The Maximaks, Regret, Hurwics and Laplace Criterions showed that the best breed was Limuzin for the producers in terms of net profit per cattle. According, the results of Wald and Utility Criterions of Game Theory, the optimal breed was Piedmont. Holstein breed was not compatible with any criterions used in this study. Since, the highest net profit per cattle ($ 588.33) is obtained from Limuzin breed by applying Maximaks Criterion, we strongly recommend this breed for optimistic producers. However, the characteristics of producers will determine which criterion to apply to choose the best breed.
  Ahmet Sahin
  NA
  Irfan Emre , Dilek Turgut-Balik , Hasan GENC and Ahmet Sahin
  In this study total 9 taxa belong to four different sections (Pratensis, Orobon, Orobus and Platystylis) collected from different regions of Turkey have been studied for the analysis of seed storage protein profiles to examine their relationship by sodium dodecyl sulphate polyacrilamide gel electrophoresis (SDS-PAGE) technique. Data obtained from electrophoresis of seed proteins were analysed using hierarchical clustering analysis and Euclidean distance was used for calculating the genetic resemblance. Dendogram was formed using average linkage. Electrophoretic protein profiles of seed cotyledons were showed that all taxa except for L. brachypterus var. brachypterus formed two clusters. The first one consisted of L. pratensis, L. laxiflorus subsp. laxiflorus, L. roseus and the second one L. digitatus, L. spathulatus, L. boissieri L. nivalis and L. aureus. In addition, total protein profile differences were observed when four taxa originated from 9 geographical regions belong to three sections (Sections Platystylis, Pratensis and Orobon) were analysed. Protein amount was found to be highest in L. spathulatus and lowest in L. brachypterus var. brachypterus.
 
 
 
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