Nuh Ocak - Academia.edu (original) (raw)

Papers by Nuh Ocak

Black Sea Journal of Agriculture

In this study, common weed species (Anthemis sp., Anthemis tinctoria L., Pilosella hoppeana Schul... more In this study, common weed species (Anthemis sp., Anthemis tinctoria L., Pilosella hoppeana Schultes, Doranicum orientale Hoffm, Muscari neglectum Guss. ex Ten., Ornithogalum armeniacum Baker, Ornithogalum narbonense L., Ornithogalum wiedemannii Boiss., Anchusa azurea Miller, Echium plantagineum L., Echium vulgare L., Ajuga orientalis L., Stachys germenica L., Juncus sp., Anacamptis pyramidalis L., Ophrys apifera Huds., Carex panicea L., Ranunculus sp., Hypericum perforatum L., Primula elatior L. Hill., and Galium rotundifolium L.) of the rangelands of Akdağ mountains, Samsun were evaluated by principal component analysis (PCA) and cluster analysis (CA). These species were collected at least three times in two consecutive years. The proximate nutrients (organic matter, ash, crude protein, ether extract, neutral and acid detergent fibre, non-fibrous carbohydrate and hemicellulose), neutral detergent fibre properties (nitrogen-free neutral detergent fibre and in vitro neutral detergen...

Vibrotal Ilavesinin Kuru Cayir Otunun Rumen Parcalanabilirligi ve Toklularda Buyume Performansi U... more Vibrotal Ilavesinin Kuru Cayir Otunun Rumen Parcalanabilirligi ve Toklularda Buyume Performansi Uzerine Etkisi

Anadolu tarım bilimleri dergisi, Oct 18, 2018

Concepts behind the best management practices of rangeland improvement include production, econom... more Concepts behind the best management practices of rangeland improvement include production, economics, as well as social and environmental aspects. Although revenue in rangelands can be increased by fertilization, total production cost can increase and as a result, net benefit may reduce due to increase in fertilizer application cost. This study examined differences between three economic analysis models (EAM): total revenue based on i) hay yield (HY), ii) conversion rate of consumable crude protein to meat on the hoof in cow-calf (CPM) and iii) yield and relative feed value (RFV) index as a new opinion to highlight the economic aspects related to the N (0, 60 and 120 kg ha-1), P (0, 60 and 120 kg ha-1) and K (0 and 80 kg ha-1) fertilization (NPK) in degraded rangelands. For this purpose, a series of data, gathered from an experiment conducted to increase the productivity of degraded rangelands by fertilization were analyzed. The results were most dissimilar for 'the revenue' variable and this difference lies in the fact that the EAMs estimated income in different ways. Due to the different revenue measurements, net benefit of CPM was the highest, while that of HY was the lowest. The HAY and RFV models indicate that NPK fertilizers did not increase forage production enough to be profitable for animal production. This study does not strive to suggest one EAM over another; however, it examines the respective models concerning various data and describes underlying characteristics of EAMs to obtain a given increase in net benefit. Anahtar Kelimeler: Ekonomik gübreleme Ham protein verimi Mera ıslahı Net karlılık Yem değeri

Black Sea Journal of Agriculture, 2022

Cultivated forage species may have higher nutrients contents (NC) and forage quality indicators (... more Cultivated forage species may have higher nutrients contents (NC) and forage quality indicators (FQI) than their wild relatives. Nine forage samples collected five times from a mixed rangeland and an experimental field during two consecutive years was analysed for ash, crude protein (CP), ether extract (EE) and neutral detergent (NDF) and acid detergent (ADF) fibres. Then, their FQI such as digestible dry matter (DDM), dry matter intake (DMI), metabolizable energy (ME) and relative forage quality (RFQ) were calculated. Data were performed in a linear model with fixed effects (forage plant type [PT] and species [PS]) to NC and FQI, and subjected to hierarchical two-way clustering analysis. Cultivated and wilds relatives varied in CP (12.0-18.9% and 8.8-23.3%), ADF (20.9-33.1% and 39.3-73.5%) and NDF (37.2-61.6% and 26.7-46.1%) contents and ME (8.7-9.7 MJ kg-1 DM and 7.0-9.6 MJ kg-1 DM) and RFQ (98.8-186.7 and 74.6-161.7) values. There were interactions between PT and PS for all NC an...

Türkiye Tarımsal Araştırmalar Dergisi

The objective of this study was to determine compatible genotypes for both grazing and ley farmin... more The objective of this study was to determine compatible genotypes for both grazing and ley farming systems concerning nutritional traits among burr medic (Medicago polymorpha L.) genotypes with different flowering times. Therefore, the variability for nutritional traits of early- (n=13), medium- (n=12) and late-flowering (n=19) genotypes from a breeding study carried out during the 2016-2018 years was assessed using one-way ANOVA and chemometric techniques such as principal component (PCA) and cluster (CA) analyses. Except for the acid detergent protein, calcium and magnesium contents, there were significant differences in the nutritional traits among the genotypes with different flowering times. The medium-flowering genotype had a significant advantage over especially early-flowering genotype in crude protein, acid detergent fiber, metabolizable energy, and relative feed value. There were significantly mutual correlations between most of the studied traits. Consequently, considerab...

Black sea journal of agriculture, Apr 1, 2022

One of factors to take into consideration to improve the rangeland quality is forage quality indi... more One of factors to take into consideration to improve the rangeland quality is forage quality indicators (FQI) such as neutral detergent fiber (NDF), acid detergent fiber (ADF), digestible dry matter (DDM), dry matter intake (DMI), crude protein (CP), metabolizable energy (ME), relative feed value (RFV) and relative forage quality (RFQ). To study the relations among these indicators and to evaluate the sources of relationships and variations among the rangeland forages, 45 different desirable forage species were collected from Akdag range-lands in Samsun province of Turkey in 2015 and 2016. All FQI were analysed using the restricted maximum likelihood and a multivariate approach. The legume, grass and the other plant family species exhibited generally the highest, the lowest and intermediate FQI, respectively. The quality score based on RFQ was higher for the other family species than those for the legume and grass species. The NDF and ADF contents of species showed negative relationship with ME, RFV and RFQ, while the CP was positively and negatively correlated with these variables. The DDM, ME, RFV, RFQ and DMI components accounted for 86.68% of total variation of species. The first cluster composed of, in general, the legume and the other family species, whereas second cluster included all grass species. In conclusion, the legume and the other family species showed higher quality than grass species. The FQI appeared mainly botanical family dependent rather than single species. The ME, RFV and RFQ rather than the CP should be mainly considered for evaluation of species. © by PSP

Black sea journal of agriculture, Dec 26, 2022

Herd management and nutrition strategies against increasing negative effects of global warming on... more Herd management and nutrition strategies against increasing negative effects of global warming on farm animals have been the subject of significant debates in recent years. The fact that the changes in the environmental conditions are directly related to the habitats of the animals and the conditions inside the barn can affect the farm animals negatively. Although effects of heat stress differ according to species, especially high-yielding dairy cattle exposed to heat stress, respond with various interactive mechanism such as physiological, biochemical, immunological, anatomical and behavioral. Therefore, with the selection practices that have been going on for many years to improve the yield characteristics of the animals significantly increased. In this respect, the increased heat load in the body of dairy cattle due to the high productivity decreases their tolerance to environmental conditions. This situation adversely affects the productivity of cows with high breeding value. Yield losses, varying according to some factors about heat stress, can be partially explained by decreasing feed intake as a result of a series of hormonal responses affecting appetite center. However, the physiological requirements of cattle must be defined in order to develop appropriate strategies to reduce or eliminate the negative effects of heat stress. In this review, the variations in physiological, biochemical and behavioral mechanisms originating from heat stress in dairy cattle and the care, nutrition and herd management strategies that can be applied to eliminate or reduce the negative effects were discussed.

Black sea journal of agriculture, Jul 1, 2022

In this study, common weed species (Anthemis sp.,

Czech Journal of Animal Science, Apr 30, 2008

Recently most of the antibacterial performance promoters have been banned because the feeding of ... more Recently most of the antibacterial performance promoters have been banned because the feeding of antibiotics is risky (Neu, 1992) due to not only cross-resistance but also to multiple resistances. The ban on the use of antibiotics as growth promoters in the European Union (Regulation 1831/2003/EC) and the potential for a ban in the United States have prompted the search for alternative feed supplements in animal production. Prebiotics, probiotics and organic acids are three of several approaches that have the potential to reduce enteric diseases and improve performance in poultry and to decrease subsequent contamination of poultry products (Patterson and Burkholder, 2003; Ricke, 2003). On the other hand, herbs or products containing plant extracts, essential oils or main components of the essential oil are among the alternative growth promoters that are already being used in practice (

DergiPark (Istanbul University), Mar 1, 1998

Anadolu tarım bilimleri dergisi, 2018

Anadolu tarım bilimleri dergisi, Feb 15, 2018

Doğal florada yetişen sarıçiçekli gazal boynuzu (Lotus corniculatus L.) ve dar yapraklı gazal boy... more Doğal florada yetişen sarıçiçekli gazal boynuzu (Lotus corniculatus L.) ve dar yapraklı gazal boynuzunun (Lotus tenuis Waldst. & Kit.) toprak tercihleri, komşu bitkileri ve yem değerleri

World Academy of Science, Engineering and Technology, International Journal of Animal and Veterinary Sciences, May 26, 2017

Journal of Animal Physiology and Animal Nutrition, Dec 21, 2020

To evaluate the effect of reduced calcium (Ca) and available P (aP) levels in starter diets on gr... more To evaluate the effect of reduced calcium (Ca) and available P (aP) levels in starter diets on growth performance and tibia, sternum and serum characteristics, and to assay the association between Ca and P (aP) intakes and these variables, 600 one-day-old broiler chicks (Ross 308) were used in a 21-days trial. Broilers were randomly allotted to five treatments with five replicate pens. Chicks were fed on one of the five starter diets that were formulated with a 10% reduction in the Ca and aP contents, starting from the control diet and hence, named as C (0.96% Ca, 0.45% aP), L1 (0.85% Ca and 0.42% aP), L2 (0.77% Ca and 0.38% aP), L3 (0.68% Ca and 0.34% aP) and L4 (0.61% Ca and 0.31% aP). Declining dietary Ca and aP levels did not affect body weight and levels of Ca, P and alkaline phosphatase in serum, but reduced linearly feed intake, the feed conversion ratio and the bone weight and ash content. The Ca and aP intakes and Ca:aP ratio displayed a positive correlation with both tibia and sternum weights, and the mass of the bones were equally sensitive to dietary Ca and aP levels. In conclusion, the body weight of young broilers was irresponsive to changes in the skeleton when exposed to early dietary Ca and aP restrictions (up to 0.61% Ca and 0.31% aP) and the mechanostat had limits due to the association between Ca and aP intakes, and bone properties.

DergiPark (Istanbul University), May 1, 2002

The experiment reported herein aimed to investigate whether sodium chloride (NaCl) provided throu... more The experiment reported herein aimed to investigate whether sodium chloride (NaCl) provided through feed and/or drinking water, compared to NaCl provided in feed, affected the live weight (LW), live weight gain (LWG), feed (FI) and water intake (WI), feed conversion ratio (FCR), carcass weight (CW) and dressing percentage (DP) of Japanese quails (Coturnix coturnix Japonica). In a randomised block experimental design, a total of 252 one-week-old Japanese quails were allocated randomly into 4 treatment groups. Each treatment group consisted of three replicates and 21 quails within each replication. The quail chickens were reared in ground cages (75 cm by 75 cm) over a 35-day experimental period. They were offered ad libitum a basal ration the composition of which was 23.97% crude protein and 3083 kcal ME/kg. Treatments were i) 2.5 g NaCl/kg supplemented in feed (control group; C), ii) 2.5 g NaCl/l supplemented in drinking water (tap water; W), iii) 1.25 g NaCl/l supplemented in feed and 1.25 g NaCl/l supplemented in drinking water (F/W) and iv) 1.25 g NaCl/l supplemented in drinking water (1 / 2 W). At the end of the experimental period, differences among the groups in terms