In situ Rumen Degradation Characteristics of Maize, Sorghum and Sorghum-Sudan Grass Hybrids Silages as Affected by Stage of Maturity
محورهای موضوعی : Camelن. کیلیکالپ 1 , اچ. هیزلی 2 , م. سومرلی 3 , ن. آوسی 4
1 - Department of Animal Science, Faculty of Agriculture, Gaziosmanpaşa University, Tokat, Turkey
2 - Agricultural Research Institute of East Mediterranean, Adana, Turkey
3 - GAP International Agricultural Research and Training Center, Diyarbakır, Turkey
4 - Department of Crop Science, Faculty of Agricultural Science and Technologies, Ömer Halisdemir University, Nigde, Turkey
کلید واژه: Maize, metabolizable energy, Sorghum, harvesting stage, rumen degradation characteristics, sorghum x Sudan grass hybrids,
چکیده مقاله :
This research was conducted to investigate in situ degradation characteristics of maize, sorghum and sorghum-Sudan grass hybrids. whole plant of maize (TTM-815, DK-711), sorghum (SS-506, FS-5) and sorghum × Sudan grass hybrids (P-988, Grazer N2) were grown under semi-arid conditions and harvested at different maturity stages (mid-flowering (MF), milk-line (ML) and hard-dough (HD)) and ensiled. Three replicate silage samples were incubated at 0, 12, 24, 36, 48, 72 and 96 h. in three rumen fistulated Holstein heifers. Effects of species had a large impact on rumen degradation characteristics values (a, b, (a+b), c), effective dry matter degradability (EDMD) and metabolizable energy (ME) MJ/kg for maize (M), sorghum (S) and sorghum × Sudan grass hybrids (SSH) silages. Effective dry matter degradability (EDMD2) of dry matter was found as 286.65, 259.37, 265.0 g/kgfor species silages, respectively (P<0.0001). Acid detergent fiber (ADF) was found to be the best single predictor of effective dry matter degradability of sorghum × Sudan grass hybrids silages (P<0.05, R=0.448).
این تحقیق با هدف مطالعه خصوصیات تجزیه در محل ذرت، سورگوم و هبریدهای سورگوم-سودان گراس صورت گرفت. گیاه کامل ذرت (TTM-815 و DK-711)، سورگوم (SS-506 و FS-5) و هبریدهای سورگوم × سودان گراس (P-988 و Grazer N2) تحت شرایط نیمه خشک پرورش داده شده و در مراحل مختلف بلوغ (اواسط گلدهی (MF)، خط شیری (ML) و خمیر سفت (HD)) برداشت شده و سیلو گردیدند. سه تکرار از نمونههای سیلو در 0، 12، 24، 36، 48، 72 و 96 ساعت در سه تلیسه هلشتاین فیستوله شده، انکوباسیون گردیدند. اثر گونه بر مقادیر خصوصیات تجزیه شکمبهای (a، b، (a+b)، c)، تجزیهپذیری ماده خشک موثر (EDMD) و انرژی قابل متابولیسم (ME) (بر حسب مگاژول در هر کیلوگرم سیلوهای ذرت (M)، سورگوم (S) و هبریدهای سورگوم × سودان گراس (SSH)) معنیدار بودند. تجزیهپذیری ماده خشک مؤثر (EDMD2) ماده خشک برای انواع مختلف سیلاژ به ترتیب 65/286، 37/259، 0/265 گرم در هر کیلوگرم به دست آمد (0001/0>P). الیاف محلول در شوینده اسیدی (ADF) بهترین پیشبینیکننده برای تجزیهپذیری ماده خشک مؤثر سیلوهای هبریدهای سورگوم × سودان گراس بود (05/0>P و 448/0=R).
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