Rumen degradability characteristics of normal maize stover and silage, and quality protein maize silage-based diets offered to cows

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• 作者：Berhan Tamir (1) berhantamir@yahoo.com
  Ephrem Gebrehawariat (2)
  Azage Tegegne (3)
  Mohammed Y. Kortu (4)
• 关键词：Degradability characteristics – Normal maize silage/stover – Quality protein maize – Rumen ammonia – Volatile fatty acid
• 刊名：Tropical Animal Health and Production
• 出版年：2012
• 出版时间：October 2012
• 年：2012
• 卷：44
• 期：7
• 页码：1547-1553
• 全文大小：147.7 KB
• 参考文献：1. CIMMYT (International Maize and Wheat Improvement Center), 2000. CIMMYT in 1999–2000. Science and subsistence. Mexico D.F.: CMMYT. ISSN: 0188-9214, pp. 6–7.
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• 作者单位：1. Department of Animal Production, Faculty of Veterinary Medicine, Addis Ababa University, P.O. Box 34, Debre Zeit, Ethiopia2. Department of Animal Production, Faculty of Agriculture, Wollega University, Nekemte, Ethiopia3. International Livestock Research Institute (ILRI), Addis Ababa, Ethiopia4. Haramaya University, P.O. Box 38, Dire Dawa, Ethiopia
• ISSN：1573-7438

文摘

Rumen degradability characteristics of dry matter (DM), organic matter (OM) and crude protein (CP) of normal maize (NM) stover (T1)-, NM silage (T2)- and quality protein maize (QPM) silage (T3)-based diets were studied using three rumen-fistulated Boran × Friesian non-lactating cows (371?±?32.00 kg) in 3?×?3 Latin Square Design. Cows were supplemented with a similar concentrate mix. In sacco degradability of DM and OM indicated that the (a) values of DM (128) and OM (114) for NM stover were lower (P?<?0.001) than that for NM silage (268 and 253) and for QPM silage (323 and 303), respectively. The (a) value for CP was lower (P?<?0.05) for QPM silage (286) than for NM stover (404) and NM silage (326). The (b) values of DM in NM stover (597) and NM silage (535) were higher (P?<?0.05) than in QPM silage (499). The (b) value of CP in NM stover (372) was lower (P?<?0.05) than in NM silage (655) and in QPM silage (608). Rate of degradation of OM in NM stover and NM silage, each with 0.03, was faster (P?<?0.01) than in QPM silage (0.02). Moreover, QPM silage had higher potentially degradable fraction for DM (821) (P?<?0.05) and OM (840) (P?<?0.01) than DM (725) and OM (712) in NM stover. The mean rumen ammonia concentration (209 mg/l) of QPM silage was higher (P?<?0.05) than that of NM stover (179 mg/l) and NM silage (170 mg/l). The average rumen pH (6.1) in cows fed QPM silage was lowest (P?<?0.05) compared to pH (6.3) in cows fed either NM stover or silage. The concentration of total volatile fatty acids (116 mmol/l) in the rumen of cows incubated with QPM silage was higher (P?<?0.001) than in those incubated with NM stover (113 mmol/l) and NM silage (110 mmol/l). It was concluded that QPM silage-based diet was superior in DM and OM degradability, and had higher ammonia and VFA concentration than NM stover-based diet. No differences have been observed in all parameters measured between QPM and NM silages.