نوع مقاله : مقاله پژوهشی
نویسندگان
1 نویسنده مسئول، گروه علوم دامی، دانشکده کشاورزی، دانشگاه رازی، کرمانشاه، ایران. رایانامه: l.taherabadi@razi.ac.ir
2 گروه علوم دامی، دانشکده کشاورزی، دانشگاه رازی، کرمانشاه، ایران.
چکیده
مطالعه حاضر به‌منظور تعیین ارزش غذایی در مراحل مختلف رشد و عملکرد تولید علف نپیر به‌عنوان یک منبع علوفه‌ای جدید در کشور انجام شد. بدین-منظور علف نپیر کشت شده در سه مرحله از رشد رویشی (به‌ترتیب 65، 85 و 115 روز پس از کاشت) برداشت شد. ترکیبات شیمیایی، قابلیت هضم، کینتیک تخمیر و برخی از صفات مورفولوژیکی این گیاه به‌همراه عملکرد تولید در مرحله نهایی رشد بررسی شد. در پایان دوره رشد، عملکرد ماده خشک26/8 تن در هکتار و ارتفاع گیاه 257 سانتی‌متر بود. با افزایش سن گیاه، پروتئین خام کاهش و لیگنین در دیواره سلولی افزایش یافت (0/05 >P) و مقادیر آن‌ها در مرحله پایانی رشد به‌ترتیب 88 و 63 گرم در کیلوگرم ماده خشک بود. تغییرات ترکیبات شیمیایی در طول رشد در ساقه بیشتر از برگ مشاهده شد. در طول دوره رشد کاهش قابلیت هضم برگ و ساقه منجر به کاهش قابلیت ماده خشک و ماده آلی علف نپیر به‌ترتیب از 782 به 649 و از 814 به 747 گرم در کیلوگرم ماده خشک شد (0/05 >P). میزان پتانسیل گاز تولیدی با افزیش سن گیاه کاهش داشت (0/05 >P). مراحل رشد تاثیری بر نرخ تخمیر تولید گاز و فاز تأخیر نداشت و بین سه مرحله رشد رویشی مورد مطالعه مقادیر آن‌ها مشابه بود. بر اساس نتایج حاصل، علف نپیر با توجه به تولید بالای ماده آلی قابل هضم در هکتار و ارزش غذایی مناسب می‌تواند به‌عنوان یک منبع علوفه‌ای مطلوب در کشور استفاده شود.
کلیدواژه‌ها
عنوان مقاله [English]
Nutritive value of Napier grass at different growth stages
نویسندگان [English]
- Leila Taherabadi 1
- Farokh Kafilzadeh 2
1 Postdoctoral Researcher, Department of Animal Science, Razi University, Kermanshah, Iran.
2 Professor, Department of Animal Science, Faculty of Agriculture, Razi University, Kermanshah, Iran.
چکیده [English]
The present study was conducted in order to determine yield and the nutritive value of Napier grass at different growth stages as a new forage source in Iran. For this purpose, Napier grass was harvested at three stages of vegetative growth (65, 85 and 115 days after planting, respectively). Chemical composition, rumen fermentation parameters, yield and some morphological traits were investigated. At the final growth stage, dry matter (DM) yield and height of Napier grass was 26.8 tons per hectare and 257 cm, respectively. With increasing age of the plant, a decrease in crude protein and an increase in lignin of cell wall was observed (P < 0.05). Crude protein and neutral detergent fiber content of the grass at this stage were 88 and 63 g/kg DM, respectively. Changes in chemical compositions during growth stages were more pronounced in the stem than in the leaf. During the growth period, the decrease in digestibility of leave and stem led to a decrease in dry matter and organic matter digestibility of Napier grass from 782 to 649 and from 814 to 747 g/kg DM, respectively (P < 0.05). The amount of gas production potential decreased with increasing plant age (P < 0.05). Fermentation rate and lag time were similar in plant harvested at the three stages of growth. The results of the present study showed that Napier grass with high yield of digestible organic matter and high nutritive value can be considered as a valuable source of forage in the country.
کلیدواژه‌ها [English]
- Digestibility
- Fermentation kinetics
- Leaf
- Napier grass
- Stem
- AOAC (2000) Official Methods of Analysis, 15th Edition. Association of Official Analytical Chemists, Washington, DC, USA.
- Blummel M and Ørskov ER (1993) Comparison of in vitro gas production and nylon bag degradability of roughages in predicting intake in cattle. Animal Feed Science and Technology, 40: 109-119.
- Halim RA, Shampazuraini S and Idris AB (2013) Yield and nutritive quality of nine Napier grass varieties in Malaysia. Malaysian Journal of Animal Science, 16 (2): 37-44.
- Huhtanen P, Seppälä A, Ahvenjärvi S and Rinne M (2008) Prediction of in vivo neutral detergent fiber digestibility and digestion rate of potentially digestible neutral detergent fiber: comparison of models. Journal of Animal Science, 86: 2657-2669.
- Karimi MM and Siddique HM (1991) Crop growth rates of old and modern wheat cultivars. Australian Journal of Agricultural Research, 42 (1): 13-20.
- Kilcher MR (1981) Plant development, stage of maturity and nutrient composition. Journal of Range Manage, 34: 363-364.
- Lee CN, Fukumoto GK, Thorn MS, Stevenson MH, Nakahata M and Ogoshi RM (2016) Bana Grass (Pennisetum purpureum): A possible forage for ruminants in Hawai ‘i. Pasture and Range Management, 11: 1-8.
- Lima MA, Gomez LD, Steele-King CG, Simister R, Bernardinelli OD, Carvalho MA, Rezende CA, Labate CA, Deazevedo ER, McQueen-Mason SJ and Polikarpov I (2014) Evaluating the composition and processing potential of novel sources of Brazilian biomass for sustainable biorenewables production. Biotechnology for Biofuels, 7 (1): 1-19.
- Lounglawan P, Lounglawan W and Suksombat W (2014) Effect of cutting interval and cutting height on yield and chemical composition of King Napier grass (Pennisetum purpureum × Pennisetum americanum). APCBEE Procedia, 8: 27-31.
- Lancashire PD, Bleiholder H, Boom TVD, Langelüddeke P, Stauss R, Weber E and Witzenberger A (1991) A uniform decimal code for growth stages of crops and weeds. Annals of applied Biology, 119 (3): 561-601.
- Motomura H, Fujii T and Suzuki M (2004) Silica deposition in relation to ageing of leaf tissues in Sasa veitchii (Carriere) Rehder (Poaceae: Bambusoideae). Annals of Botany, 93: 235-248.
- McDonald IM (1981) A revised model for the estimation of protein degradability in the rumen. The Journal of Agricultural Science, 96 (1): 251-252.
- McDonald P, Henderson AR and Heron SJE (1991) The biochemistry of silage. Chalcombe publications.
- McDougall EI (1948) The composition and output of sheep's saliva. The Biochemical Journal 43 (1): 99-109.
- Minson DJ (1984) Digestibility and voluntary intake by sheep of five Digitaria species. Australian Journal of Experimental Agriculture, 24 (127): 494-500.
- Negawo AT, Teshome A, Kumar A, Hanson J and Jones CS (2017) Opportunities for Napier grass (Pennisetum purpureum) improvement using molecular genetics. Agronomy, 7 (2): 28.
- Nguyen BT, Le LB, Pham LP, Nguyen HT, Tran TD and Van Thai N (2021) The effects of biochar on the biomass yield of elephant grass (Pennisetum purpureum Schumach) and properties of acidic soils. Industrial Crops and Products, 161: 113224.
- Rusdy M (2016) Elephant grass as forage for ruminant animals. Livestock Research for Rural Development, 28 (4).
- Rambau MD, Fushai, F and Baloyi JJ (2016) Productivity, chemical composition and ruminal degradability of irrigated Napier grass leaves harvested at three stages of maturity. South African Journal of Animal Science, 46 (4): 398-408.
- Salamone AM, AbuGhazaleh AA and Stuemke C (2012) The effects of maturity and preservation method on nutrient composition and digestibility of master graze. Journal of Animal Research and Technology, 1 (1): 13-19.
- Theodorou MK, Williams BA, Dhanoa MS, McAllan AB and France J (1994) A simple gas production method using a pressure transducer to determine the fermentation kinetics of ruminant feeds. Animal Feed Science and Technology, 48 (3-4): 185-197.
- Tilley JMA and Terry DR (1963) A two‐stage technique for the in vitro digestion of forage crops. Grass and Forage Science, 18 (2): 104-111.
- Van Soest PV, Robertson JB and Lewis B (1991) Methods for dietary fiber, neutral detergent fiber, and nonstarch polysaccharides in relation to animal nutrition. Journal of Dairy Science, 74 (10): 3583-3597.
- Van Soest PJ (1994) Nutritional ecology of the ruminant. Comstock Publishing Associates. A division of Cornell University Press, Ithaca and London.
Zewdu T (2005) Variation in growth, yield, chemical composition and in vitro dry matter digestibility of Napier grass accessions (Pennisetum purpureum). Tropical Science, 45 (2): 67-73.
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