断奶仔猪(3).pdf

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Weaner Pig Chap 03 26/9/01 2:02 PM Page 45will be defined. Some measure
of the availability of the amino acids, such as apparent ileal or true ileal digestibility,
may be made. The means of providing this protein will to a large extent be given
little consideration apart from limiting the maximum inclusion of certain raw materials
that contain performance-limiting anti-nutritional factors, such as rapeseed meal,
legumes and soya.
© CAB International 2001. The Weaner Pig: Nutrition and Management
(eds . Varley and J. Wiseman) 45Weaner Pig Chap 03 26/9/01 2:02 PM Page 46
46 M. Cole and M. Sprent
The protein requirement of the weaner pig has to be considered somewhat dif-
ferently. Raw materials used in diets designed for this age range supply not only
nitrogen and essential amino acids but also other proteins that have a secondary role
not related to the supply of nutrients. Immunoglobulins, whose inclusion in feed is
more to do with their functional properties than their direct nutritional value,
would be included in this category.
Published levels for the requirements of amino acids and those used in com-
mercial practice are often somewhat different, particularly for the weaned pig. This
chapter will consider both aspects, along with the levels and types of raw materials
used to supply protein to the weaned pig.
It is worth noting that formulations for pre-starter and starter feeds are character-
ized around the world by the use of certain raw materials. Most American nutritionists
would include plasma proteins in diets; those in the UK would use