Efficiency of Feed Utilisation by Ruminants
نویسنده
چکیده
Metabolisable energy content of a feed or its components has been used to assess its feeding value for ruminants. The demonstration that VFA energy could, at times, be used highly inefficiently when included in a roughage diet, led to the suggestion that feeds for ruminants should be evaluated in terms of their net energy. The establishment of calorimetry technology in nutritional research was a direct result of the apparent need to measure heat production in animals to develop systems of feed evaluation based on net or metabolisable energy. The formation in 1970 of "The Feeding Stuffs Evaluation Unit" at the Rowett Research Institute was the forerunner of the attempts to develop such a system of feeding standards (see Blaxter 1982). These systems have been developed with a narrow group of *common' feeds with high digestibilities and usually high in protein. However, even on such feeds the relationship between measured metabolisable energy values and those calculated from chemical compositions, are poor. This led Blaxter (1982) to end a lecture given to the annual Nutrition Conference for Feed Xanufacturers at Nottingham in the following way. *'The two *best' equations (relating observed and computed XEs) based on an entirely chemical approach do not seem as satisfactory as one based on physical me.asure of heat of combustion and the biolo@cal one of in vitro digestibility".
منابع مشابه
Some Factors Influencing the Efficiency of Feed Utilisation by Ruminants with Special Reference to the Tropics
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