Evaluation of nutritive value and in vitro rumen fermentation gas accumulation of de-oiled algal residues

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• 作者：Kun Jun Han ; Michael E McCormick
• 关键词：Crude protein ; De ; oiled algal residue ; Feed supplement ; in vitro rumen fermentation gas ; Macro mineral ; Micro mineral
• 刊名：Journal of Animal Science and Biotechnology
• 出版年：2014
• 出版时间：December 2014
• 年：2014
• 卷：5
• 期：1
• 全文大小：415 KB
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• 刊物主题：Agriculture; Biotechnology; Food Science; Animal Genetics and Genomics; Animal Physiology;
• 出版者：BioMed Central
• ISSN：2049-1891

文摘

Background Algae are widely recognized for their high oil content and for exponentially accumulating biomass with particular potential to provide single cell protein for human consumption or animal feed. It is believed that along with biodiesel from algae, the high protein de-oiled algal residue may become an alternative feed supplement option in the future. This study was conducted to investigate de-oiled algal residue obtained from the common Chlorella species, Thalassiosira weissflogii, Selenarstrum capricornutum, Scenedesmus sp., and Scenedesmus dimorphus for assessment as potential feed supplements for ruminants by comparing with soybean (Glycine max) meal and alfalfa (Medicago sativa) hay. Results With the exception of T. weissflogii, algal residue had higher concentrations of Cu, Zn, and Mn and lower concentration of Ca, Mg, and K than soybean meal and alfalfa hay. The algal residue CP (crude protein) concentrations ranged from 140 to 445?g/kg DM and varied among the de-oiled residues. In vitro rumen fermentation gas accumulation curves indicated that algal biomass degradation potential was less than that of soybean meal or alfalfa hay by up to 41.7%. The gas production curve, interpreted with a dual pool logistic model, confirmed that the fraction sizes for fast fermenting and slow fermenting of de-oiled algal residues were smaller than those in soybean meal and alfalfa hay, and the fermenting rate of the fractions was also low. Conclusions Inferior in vitro rumen gas accumulation from the five de-oiled algal residues suggests that these algal byproducts are less degradable in the rumen.