title: Effect of supplementation of mustard oil cake on intake, digestibility and microbial protein synthesis of cattle in a straw-based diet in Bangladesh.
abstract: The objective of this study was to analyse the effects of different levels of rumen-degradable protein (RDP) on intake, digestibility and microbial protein synthesis by supplementing mustard oil cake (MOC) on rice straw-based diet of cattle (Bos indicus) in Bangladesh. A 4 × 4 Latin square design was applied. Four diets having constant energy (7.0 MJ/kg of dry matter (DM)) with varying levels of RDP (M(0) = 4.1 g/MJ (control), M(1) = 6.3 g/MJ, M(2) = 8.3 g/MJ and M(3) = 12.4 g/MJ of metabolizable energy (ME)) were received by each animal for a period of 28 days. A metabolism trial was conducted for 7 days. Results indicate that with increasing levels of RDP, crude protein (CP) and RDP intake increased significantly (P < 0.01). The significant (P < 0.01) increase in digestibility values are obtained for DM, organic matter, CP and digestible organic matter in the rumen. The digestibility of neutral detergent fibre and acid detergent fibre was also increased significantly (P < 0.05). The total nitrogen (N), ammonia-N and total volatile fatty acids increase significantly (P < 0.01) while the rumen pH increased from M(0) to M(2) and decreased thereafter. The efficiency microbial N intake increased significantly (P < 0.01) but showed a curvilinear response with higher RDP level (12.40 g/RDP/MJ ME). This study concludes that supplementation of RDP from MOC enhances the intake, digestibility and microbial protein synthesis which ultimately increases utilization of low-quality feed resources that can be used for developing cost-effective feeding systems on a straw-based diet in tropical regions.
authors.affiliation: Department of Animal Nutrition, Bangladesh Agricultural University, Mymensingh 2202, Bangladesh. zhkhandaker@yahoo.com
authors.forename: Zahirul Haque
authors.initials: ZH
authors.lastname: Khandaker
authors.forename: Mohammad Mohi
authors.initials: MM
authors.lastname: Uddin
authors.forename: Nadira
authors.initials: N
authors.lastname: Sultana
authors.forename: Kurt J
authors.initials: KJ
authors.lastname: Peters
mesh_terms: D000821:Animal Feed / Q000032:analysis*; D000822:Animal Husbandry / Q000191:economics; D000818:Animals; D001419:Bacteria / Q000378:metabolism; D001459:Bangladesh; D002417:Cattle / Q000502:physiology; D003612:Dairying / Q000191:economics; D004043:Dietary Fiber / Q000378:metabolism; D004044:Dietary Proteins / Q000008:administration & dosage*; D019587:Dietary Supplements; D004063:Digestion; D004435:Eating; D005232:Fatty Acids, Volatile / Q000378:metabolism; D005260:Female; D005285:Fermentation; D009149:Mustard Plant / Q000378:metabolism*; D009584:Nitrogen / Q000378:metabolism; D009753:Nutritive Value; D010938:Plant Oils / Q000378:metabolism*; D014176:Protein Biosynthesis; D012417:Rumen / Q000378:metabolism* / Q000382:microbiology*
chemical_list: D004043:Dietary Fiber; D004044:Dietary Proteins; D005232:Fatty Acids, Volatile; D010938:Plant Oils; D009584:Nitrogen; C027793:mustard oil