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    Effects of different ration scenarios on fecal-greenhouse gas emissions from awassi ewes
    (2018) Yurtseven, Sabri; Avcı, Mehmet; Çetin, Mehmet; Öztürk, İrfan; Boğa, Mustafa
    C4 plants are known as plants with high photosynthesis ability, which can be welladapted to the sunny regions, and corn/maize is a good example. This studyinvestigated the effect of diets with different ratios of C4:C3 plant materials on CH4,CO2, and N2O emissions from manure produced by Awassi ewes. The trial comparedthe production of greenhouse gases from manures produced by sheep fed diets withlow C4:C3 ratios (Group A–0.95:1) to those fed high C4:C3 plant ratios (Groups B–1:1;C–1.5:1; D–2:1). The trial was a randomized design with four groups and each groupcontained four sheep (total 16). The main feedstuffs were alfalfa and maize basedcombinations with similar nutrient contents. The body weight gain (BWG) and thefeed conversion ratio (FCR) of the sheep were affected by C4:C3 ratio. They increasedin the higher C4 plant-consuming groups, despite similar feed consumption. Manurecomponents were not affected by the feed ratio, except for N, pH, and Neutraldetergent fiber (NDF). Total diet digestibility of N increased cubically when maizesilage was included (Groups B and D). The use of C3 plants as forage or grain sourcesled to increased manure and manure gas production (P = 0.04 and linear effect: 0.03).Regardless of the C4:C3 ratio, alfalfa increased N2O emissions from manures becausemore manure was produced by groups A and C. The temperature, humidity and moldof the manures were the main causes of the rise in the amount of manure based CO2in the alfalfa and maize based groups.